[{"data":1,"prerenderedAt":9241},["ShallowReactive",2],{"learn-\u002Flearn\u002Ftools\u002Fpolygon-area":3,"learn-\u002Flearn\u002Ftools\u002Fpolygon-area-surround":9230},{"id":4,"title":5,"body":6,"category":9219,"description":9220,"extension":9221,"meta":9222,"navigation":9223,"order":9224,"path":9225,"seo":9226,"sitemap":9227,"stem":9228,"__hash__":9229},"learn\u002Flearn\u002Ftools\u002Fpolygon-area.md","Polygon Area",{"type":7,"value":8,"toc":9198},"minimark",[9,14,24,28,31,34,38,120,123,289,440,444,452,533,665,669,672,706,1194,1491,1970,1973,2382,2668,2672,3110,3600,3603,4106,4256,4505,4509,4512,5495,5906,6356,7291,7294,7832,8058,8061,8128,8131,8303,8309,8313,8316,8321,8462,8634,8638,8645,8649,8652,8656,8659,8907,8910,8914,9123,9127,9135,9139],[10,11,13],"h2",{"id":12},"introduction","Introduction",[15,16,17,18,23],"p",{},"In civil engineering, land surveying, and geomatics, calculating the planimetric area and perimeter of bounded land parcels is a core requirement. Whether verifying boundary dimensions for cadastral land transfers, determining footprints of structural foundations, or computing earthwork quantities for infrastructure developments, precise geometric calculations are paramount. Modern workflows rely on digital systems to process field observations, making coordinate geometry (COGO) the analytical standard over legacy manual drafting or planimeter tracing. The ",[19,20,22],"a",{"href":21},"\u002Ftools\u002Fpolygon-area","Polygon area calculator"," provides a fast, reliable interface for ordered easting\u002Fnorthing pairs, outputting plan area and perimeter with minimal manual overhead.",[10,25,27],{"id":26},"plan-area-determination-in-engineering-surveying","Plan Area Determination in Engineering Surveying",[15,29,30],{},"Before computerized coordinate geometry, surveyors calculated parcel areas using physical measurements recorded in field books. Early boundaries were measured with Gunter's chains or steel tapes, with areas derived by partitioning irregular tracts into triangles or by taking perpendicular offsets from a baseline using the trapezoidal or Simpson's rules. These methods suffered from error propagation across the calculation and required heavy approximation for irregular curves.",[15,32,33],{},"Mandatory theodolite observations, electronic distance measurement (EDM), and high-precision GNSS catalyzed a shift to coordinate-based computation. By defining boundaries as ordered grid coordinate pairs on a projected Cartesian plane, surveyors replaced graphical approximations with exact algebraic formulations. This shift eliminated many drafting errors and established a framework that integrates with GIS and CAD. Professional bodies such as RICS emphasize coordinate competence for conveyancing and land planning.",[10,35,37],{"id":36},"coordinate-systems-and-projected-grids","Coordinate Systems and Projected Grids",[15,39,40,41,88,89,119],{},"In plane surveying, calculations assume a flat two-dimensional Cartesian plane where horizontal locations are identified by easting (",[42,43,46,68],"span",{"className":44},[45],"katex",[42,47,50],{"className":48},[49],"katex-mathml",[51,52,54],"math",{"xmlns":53},"http:\u002F\u002Fwww.w3.org\u002F1998\u002FMath\u002FMathML",[55,56,57,64],"semantics",{},[58,59,60],"mrow",{},[61,62,63],"mi",{},"E",[65,66,63],"annotation",{"encoding":67},"application\u002Fx-tex",[42,69,73],{"className":70,"ariaHidden":72},[71],"katex-html","true",[42,74,77,82],{"className":75},[76],"base",[42,78],{"className":79,"style":81},[80],"strut","height:0.6833em;",[42,83,63],{"className":84,"style":87},[85,86],"mord","mathnormal","margin-right:0.0576em;",") and northing (",[42,90,92,106],{"className":91},[45],[42,93,95],{"className":94},[49],[51,96,97],{"xmlns":53},[55,98,99,104],{},[58,100,101],{},[61,102,103],{},"N",[65,105,103],{"encoding":67},[42,107,109],{"className":108,"ariaHidden":72},[71],[42,110,112,115],{"className":111},[76],[42,113],{"className":114,"style":81},[80],[42,116,103],{"className":117,"style":118},[85,86],"margin-right:0.109em;",") pairs. This model simplifies ellipsoidal geometry into Euclidean math, which is highly accurate for localized engineering projects. Grid systems — UTM, State Plane, and regional grids — project the curved Earth onto a 2D plane.",[15,121,122],{},"Grid distances differ from ground distances by projection and height factors. Surveyors must account for these when translating field measurements to the coordinate plane. When converting bearings and horizontal distances to grid coordinates:",[15,124,125,214],{},[42,126,128,162],{"className":127},[45],[42,129,131],{"className":130},[49],[51,132,133],{"xmlns":53},[55,134,135,159],{},[58,136,137,141,143,147,150,153,156],{},[61,138,140],{"mathvariant":139},"normal","Δ",[61,142,63],{},[144,145,146],"mo",{},"=",[61,148,149],{},"D",[61,151,152],{},"sin",[144,154,155],{},"⁡",[61,157,158],{},"θ",[65,160,161],{"encoding":67},"\\Delta E = D \\sin\\theta",[42,163,165,189],{"className":164,"ariaHidden":72},[71],[42,166,168,171,174,177,182,186],{"className":167},[76],[42,169],{"className":170,"style":81},[80],[42,172,140],{"className":173},[85],[42,175,63],{"className":176,"style":87},[85,86],[42,178],{"className":179,"style":181},[180],"mspace","margin-right:0.2778em;",[42,183,146],{"className":184},[185],"mrel",[42,187],{"className":188,"style":181},[180],[42,190,192,196,200,204,208,211],{"className":191},[76],[42,193],{"className":194,"style":195},[80],"height:0.6944em;",[42,197,149],{"className":198,"style":199},[85,86],"margin-right:0.0278em;",[42,201],{"className":202,"style":203},[180],"margin-right:0.1667em;",[42,205,152],{"className":206},[207],"mop",[42,209],{"className":210,"style":203},[180],[42,212,158],{"className":213,"style":199},[85,86],[42,215,217,244],{"className":216},[45],[42,218,220],{"className":219},[49],[51,221,222],{"xmlns":53},[55,223,224,241],{},[58,225,226,228,230,232,234,237,239],{},[61,227,140],{"mathvariant":139},[61,229,103],{},[144,231,146],{},[61,233,149],{},[61,235,236],{},"cos",[144,238,155],{},[61,240,158],{},[65,242,243],{"encoding":67},"\\Delta N = D \\cos\\theta",[42,245,247,268],{"className":246,"ariaHidden":72},[71],[42,248,250,253,256,259,262,265],{"className":249},[76],[42,251],{"className":252,"style":81},[80],[42,254,140],{"className":255},[85],[42,257,103],{"className":258,"style":118},[85,86],[42,260],{"className":261,"style":181},[180],[42,263,146],{"className":264},[185],[42,266],{"className":267,"style":181},[180],[42,269,271,274,277,280,283,286],{"className":270},[76],[42,272],{"className":273,"style":195},[80],[42,275,149],{"className":276,"style":199},[85,86],[42,278],{"className":279,"style":203},[180],[42,281,236],{"className":282},[207],[42,284],{"className":285,"style":203},[180],[42,287,158],{"className":288,"style":199},[85,86],[15,290,291,292,434,435,439],{},"Absolute position follows ",[42,293,295,327],{"className":294},[45],[42,296,298],{"className":297},[49],[51,299,300],{"xmlns":53},[55,301,302,324],{},[58,303,304,306,308,317,320,322],{},[61,305,63],{},[144,307,146],{},[309,310,311,313],"msub",{},[61,312,63],{},[314,315,316],"mn",{},"0",[144,318,319],{},"+",[61,321,140],{"mathvariant":139},[61,323,63],{},[65,325,326],{"encoding":67},"E = E_0 + \\Delta E",[42,328,330,348,422],{"className":329,"ariaHidden":72},[71],[42,331,333,336,339,342,345],{"className":332},[76],[42,334],{"className":335,"style":81},[80],[42,337,63],{"className":338,"style":87},[85,86],[42,340],{"className":341,"style":181},[180],[42,343,146],{"className":344},[185],[42,346],{"className":347,"style":181},[180],[42,349,351,355,411,415,419],{"className":350},[76],[42,352],{"className":353,"style":354},[80],"height:0.8333em;vertical-align:-0.15em;",[42,356,358,361],{"className":357},[85],[42,359,63],{"className":360,"style":87},[85,86],[42,362,365],{"className":363},[364],"msupsub",[42,366,370,402],{"className":367},[368,369],"vlist-t","vlist-t2",[42,371,374,397],{"className":372},[373],"vlist-r",[42,375,379],{"className":376,"style":378},[377],"vlist","height:0.3011em;",[42,380,382,387],{"style":381},"top:-2.55em;margin-left:-0.0576em;margin-right:0.05em;",[42,383],{"className":384,"style":386},[385],"pstrut","height:2.7em;",[42,388,394],{"className":389},[390,391,392,393],"sizing","reset-size6","size3","mtight",[42,395,316],{"className":396},[85,393],[42,398,401],{"className":399},[400],"vlist-s","​",[42,403,405],{"className":404},[373],[42,406,409],{"className":407,"style":408},[377],"height:0.15em;",[42,410],{},[42,412],{"className":413,"style":414},[180],"margin-right:0.2222em;",[42,416,319],{"className":417},[418],"mbin",[42,420],{"className":421,"style":414},[180],[42,423,425,428,431],{"className":424},[76],[42,426],{"className":427,"style":81},[80],[42,429,140],{"className":430},[85],[42,432,63],{"className":433,"style":87},[85,86]," (and similarly for northing). For forward\u002Finverse coordinate steps, use the ",[19,436,438],{"href":437},"\u002Ftools\u002Fcalculators\u002Fbearing-distance","Bearing & distance calculator",". Once vertices lie on the grid, planimetric area follows from coordinate algorithms.",[10,441,443],{"id":442},"vertex-winding-and-signed-area","Vertex Winding and Signed Area",[15,445,446,447,451],{},"When computing area from coordinates, vertex order matters. The Shoelace sum yields a ",[448,449,450],"strong",{},"signed area"," depending on whether the boundary is traversed clockwise or counter-clockwise (CCW).",[15,453,454,455,491,492,529,530,532],{},"In a standard mathematical frame with ",[42,456,458,475],{"className":457},[45],[42,459,461],{"className":460},[49],[51,462,463],{"xmlns":53},[55,464,465,472],{},[58,466,467,469],{},[144,468,319],{},[61,470,471],{},"x",[65,473,474],{"encoding":67},"+x",[42,476,478],{"className":477,"ariaHidden":72},[71],[42,479,481,485,488],{"className":480},[76],[42,482],{"className":483,"style":484},[80],"height:0.6667em;vertical-align:-0.0833em;",[42,486,319],{"className":487},[85],[42,489,471],{"className":490},[85,86]," east and ",[42,493,495,512],{"className":494},[45],[42,496,498],{"className":497},[49],[51,499,500],{"xmlns":53},[55,501,502,509],{},[58,503,504,506],{},[144,505,319],{},[61,507,508],{},"y",[65,510,511],{"encoding":67},"+y",[42,513,515],{"className":514,"ariaHidden":72},[71],[42,516,518,522,525],{"className":517},[76],[42,519],{"className":520,"style":521},[80],"height:0.7778em;vertical-align:-0.1944em;",[42,523,319],{"className":524},[85],[42,526,508],{"className":527,"style":528},[85,86],"margin-right:0.0359em;"," north, CCW traversal typically yields positive signed area; CW yields negative signed area. Physical parcel area is always non-negative, so practitioners take the absolute value of the signed result — as the ",[19,531,22],{"href":21}," does.",[534,535,536,555],"table",{},[537,538,539],"thead",{},[540,541,542,546,549,552],"tr",{},[543,544,545],"th",{},"Winding order",[543,547,548],{},"Traversal",[543,550,551],{},"Sign of result",[543,553,554],{},"Reported plan area",[556,557,558,614],"tbody",{},[540,559,560,564,567,570],{},[561,562,563],"td",{},"Anticlockwise",[561,565,566],{},"CCW",[561,568,569],{},"Positive (+)",[561,571,572],{},[42,573,575,595],{"className":574},[45],[42,576,578],{"className":577},[49],[51,579,580],{"xmlns":53},[55,581,582,592],{},[58,583,584,587,590],{},[61,585,586],{"mathvariant":139},"∥",[61,588,589],{},"A",[61,591,586],{"mathvariant":139},[65,593,594],{"encoding":67},"\\|A\\|",[42,596,598],{"className":597,"ariaHidden":72},[71],[42,599,601,605,608,611],{"className":600},[76],[42,602],{"className":603,"style":604},[80],"height:1em;vertical-align:-0.25em;",[42,606,586],{"className":607},[85],[42,609,589],{"className":610},[85,86],[42,612,586],{"className":613},[85],[540,615,616,619,622,625],{},[561,617,618],{},"Clockwise",[561,620,621],{},"CW",[561,623,624],{},"Negative (−)",[561,626,627],{},[42,628,630,647],{"className":629},[45],[42,631,633],{"className":632},[49],[51,634,635],{"xmlns":53},[55,636,637,645],{},[58,638,639,641,643],{},[61,640,586],{"mathvariant":139},[61,642,589],{},[61,644,586],{"mathvariant":139},[65,646,594],{"encoding":67},[42,648,650],{"className":649,"ariaHidden":72},[71],[42,651,653,656,659,662],{"className":652},[76],[42,654],{"className":655,"style":604},[80],[42,657,586],{"className":658},[85],[42,660,589],{"className":661},[85,86],[42,663,586],{"className":664},[85],[10,666,668],{"id":667},"the-shoelace-formula-surveyors-formula","The Shoelace Formula (Surveyor's Formula)",[15,670,671],{},"The algorithm for a simple polygon from Cartesian coordinates is known as the Shoelace formula, Gauss's area formula, or the surveyor's formula. It is a discrete form of Green's theorem: a line integral around a closed boundary expressed as a sum of cross-products between consecutive vertices.",[15,673,674,675,705],{},"For ",[42,676,678,692],{"className":677},[45],[42,679,681],{"className":680},[49],[51,682,683],{"xmlns":53},[55,684,685,690],{},[58,686,687],{},[61,688,689],{},"n",[65,691,689],{"encoding":67},[42,693,695],{"className":694,"ariaHidden":72},[71],[42,696,698,702],{"className":697},[76],[42,699],{"className":700,"style":701},[80],"height:0.4306em;",[42,703,689],{"className":704},[85,86]," vertices ordered around the perimeter:",[15,707,708],{},[42,709,711,806],{"className":710},[45],[42,712,714],{"className":713},[49],[51,715,716],{"xmlns":53},[55,717,718,803],{},[58,719,720,722,724,733],{},[61,721,589],{},[144,723,146],{},[725,726,727,730],"mfrac",{},[314,728,729],{},"1",[314,731,732],{},"2",[58,734,735,738,755,759,765,777,780,792,798,801],{},[144,736,737],{"fence":72},"∣",[739,740,741,744,753],"msubsup",{},[144,742,743],{},"∑",[58,745,746,749,751],{},[61,747,748],{},"i",[144,750,146],{},[314,752,729],{},[61,754,689],{},[144,756,758],{"stretchy":757},"false","(",[309,760,761,763],{},[61,762,63],{},[61,764,748],{},[309,766,767,769],{},[61,768,103],{},[58,770,771,773,775],{},[61,772,748],{},[144,774,319],{},[314,776,729],{},[144,778,779],{},"−",[309,781,782,784],{},[61,783,63],{},[58,785,786,788,790],{},[61,787,748],{},[144,789,319],{},[314,791,729],{},[309,793,794,796],{},[61,795,103],{},[61,797,748],{},[144,799,800],{"stretchy":757},")",[144,802,737],{"fence":72},[65,804,805],{"encoding":67},"A = \\frac{1}{2} \\left| \\sum_{i=1}^{n} (E_i N_{i+1} - E_{i+1} N_i) 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",[42,1885,1887,1911],{"className":1886},[45],[42,1888,1890],{"className":1889},[49],[51,1891,1892],{"xmlns":53},[55,1893,1894,1908],{},[58,1895,1896],{},[309,1897,1898,1900],{},[61,1899,1826],{},[58,1901,1902,1904,1906],{},[61,1903,748],{},[144,1905,319],{},[314,1907,729],{},[65,1909,1910],{"encoding":67},"P_{i+1}",[42,1912,1914],{"className":1913,"ariaHidden":72},[71],[42,1915,1917,1920],{"className":1916},[76],[42,1918],{"className":1919,"style":1556},[80],[42,1921,1923,1926],{"className":1922},[85],[42,1924,1826],{"className":1925,"style":1847},[85,86],[42,1927,1929],{"className":1928},[364],[42,1930,1932,1961],{"className":1931},[368,369],[42,1933,1935,1958],{"className":1934},[373],[42,1936,1938],{"className":1937,"style":1016},[377],[42,1939,1940,1943],{"style":1862},[42,1941],{"className":1942,"style":386},[385],[42,1944,1946],{"className":1945},[390,391,392,393],[42,1947,1949,1952,1955],{"className":1948},[85,393],[42,1950,748],{"className":1951},[85,86,393],[42,1953,319],{"className":1954},[418,393],[42,1956,729],{"className":1957},[85,393],[42,1959,401],{"className":1960},[400],[42,1962,1964],{"className":1963},[373],[42,1965,1967],{"className":1966,"style":1087},[377],[42,1968],{},". Summing these terms cancels exterior regions, leaving the enclosed area.",[15,1971,1972],{},"An equivalent form using coordinate differences reduces multiplications:",[15,1974,1975],{},[42,1976,1978,2056],{"className":1977},[45],[42,1979,1981],{"className":1980},[49],[51,1982,1983],{"xmlns":53},[55,1984,1985,2053],{},[58,1986,1987,1989,1991,1997],{},[61,1988,589],{},[144,1990,146],{},[725,1992,1993,1995],{},[314,1994,729],{},[314,1996,732],{},[58,1998,1999,2001,2015,2021,2023,2035,2037,2049,2051],{},[144,2000,737],{"fence":72},[739,2002,2003,2005,2013],{},[144,2004,743],{},[58,2006,2007,2009,2011],{},[61,2008,748],{},[144,2010,146],{},[314,2012,729],{},[61,2014,689],{},[309,2016,2017,2019],{},[61,2018,63],{},[61,2020,748],{},[144,2022,758],{"stretchy":757},[309,2024,2025,2027],{},[61,2026,103],{},[58,2028,2029,2031,2033],{},[61,2030,748],{},[144,2032,319],{},[314,2034,729],{},[144,2036,779],{},[309,2038,2039,2041],{},[61,2040,103],{},[58,2042,2043,2045,2047],{},[61,2044,748],{},[144,2046,779],{},[314,2048,729],{},[144,2050,800],{"stretchy":757},[144,2052,737],{"fence":72},[65,2054,2055],{"encoding":67},"A = \\frac{1}{2} \\left| \\sum_{i=1}^{n} E_i(N_{i+1} - N_{i-1}) \\right|",[42,2057,2059,2077],{"className":2058,"ariaHidden":72},[71],[42,2060,2062,2065,2068,2071,2074],{"className":2061},[76],[42,2063],{"className":2064,"style":81},[80],[42,2066,589],{"className":2067},[85,86],[42,2069],{"className":2070,"style":181},[180],[42,2072,146],{"className":2073},[185],[42,2075],{"className":2076,"style":181},[180],[42,2078,2080,2083,2151,2154],{"className":2079},[76],[42,2081],{"className":2082,"style":833},[80],[42,2084,2086,2089,2148],{"className":2085},[85],[42,2087],{"className":2088},[840,841],[42,2090,2092],{"className":2091},[725],[42,2093,2095,2140],{"className":2094},[368,369],[42,2096,2098,2137],{"className":2097},[373],[42,2099,2101,2115,2123],{"className":2100,"style":854},[377],[42,2102,2103,2106],{"style":857},[42,2104],{"className":2105,"style":861},[385],[42,2107,2109],{"className":2108},[390,391,392,393],[42,2110,2112],{"className":2111},[85,393],[42,2113,732],{"className":2114},[85,393],[42,2116,2117,2120],{"style":873},[42,2118],{"className":2119,"style":861},[385],[42,2121],{"className":2122,"style":881},[880],[42,2124,2125,2128],{"style":884},[42,2126],{"className":2127,"style":861},[385],[42,2129,2131],{"className":2130},[390,391,392,393],[42,2132,2134],{"className":2133},[85,393],[42,2135,729],{"className":2136},[85,393],[42,2138,401],{"className":2139},[400],[42,2141,2143],{"className":2142},[373],[42,2144,2146],{"className":2145,"style":906},[377],[42,2147],{},[42,2149],{"className":2150},[912,841],[42,2152],{"className":2153,"style":203},[180],[42,2155,2157,2160,2223,2226,2266,2269,2318,2321,2324,2327,2376,2379],{"className":2156},[919],[42,2158,737],{"className":2159,"style":924},[840,923],[42,2161,2163,2166],{"className":2162},[207],[42,2164,743],{"className":2165,"style":933},[207,931,932],[42,2167,2169],{"className":2168},[364],[42,2170,2172,2215],{"className":2171},[368,369],[42,2173,2175,2212],{"className":2174},[373],[42,2176,2178,2198],{"className":2177,"style":946},[377],[42,2179,2180,2183],{"style":949},[42,2181],{"className":2182,"style":386},[385],[42,2184,2186],{"className":2185},[390,391,392,393],[42,2187,2189,2192,2195],{"className":2188},[85,393],[42,2190,748],{"className":2191},[85,86,393],[42,2193,146],{"className":2194},[185,393],[42,2196,729],{"className":2197},[85,393],[42,2199,2200,2203],{"style":970},[42,2201],{"className":2202,"style":386},[385],[42,2204,2206],{"className":2205},[390,391,392,393],[42,2207,2209],{"className":2208},[85,393],[42,2210,689],{"className":2211},[85,86,393],[42,2213,401],{"className":2214},[400],[42,2216,2218],{"className":2217},[373],[42,2219,2221],{"className":2220,"style":992},[377],[42,2222],{},[42,2224],{"className":2225,"style":203},[180],[42,2227,2229,2232],{"className":2228},[85],[42,2230,63],{"className":2231,"style":87},[85,86],[42,2233,2235],{"className":2234},[364],[42,2236,2238,2258],{"className":2237},[368,369],[42,2239,2241,2255],{"className":2240},[373],[42,2242,2244],{"className":2243,"style":1016},[377],[42,2245,2246,2249],{"style":381},[42,2247],{"className":2248,"style":386},[385],[42,2250,2252],{"className":2251},[390,391,392,393],[42,2253,748],{"className":2254},[85,86,393],[42,2256,401],{"className":2257},[400],[42,2259,2261],{"className":2260},[373],[42,2262,2264],{"className":2263,"style":408},[377],[42,2265],{},[42,2267,758],{"className":2268},[840],[42,2270,2272,2275],{"className":2271},[85],[42,2273,103],{"className":2274,"style":118},[85,86],[42,2276,2278],{"className":2277},[364],[42,2279,2281,2310],{"className":2280},[368,369],[42,2282,2284,2307],{"className":2283},[373],[42,2285,2287],{"className":2286,"style":1016},[377],[42,2288,2289,2292],{"style":1059},[42,2290],{"className":2291,"style":386},[385],[42,2293,2295],{"className":2294},[390,391,392,393],[42,2296,2298,2301,2304],{"className":2297},[85,393],[42,2299,748],{"className":2300},[85,86,393],[42,2302,319],{"className":2303},[418,393],[42,2305,729],{"className":2306},[85,393],[42,2308,401],{"className":2309},[400],[42,2311,2313],{"className":2312},[373],[42,2314,2316],{"className":2315,"style":1087},[377],[42,2317],{},[42,2319],{"className":2320,"style":414},[180],[42,2322,779],{"className":2323},[418],[42,2325],{"className":2326,"style":414},[180],[42,2328,2330,2333],{"className":2329},[85],[42,2331,103],{"className":2332,"style":118},[85,86],[42,2334,2336],{"className":2335},[364],[42,2337,2339,2368],{"className":2338},[368,369],[42,2340,2342,2365],{"className":2341},[373],[42,2343,2345],{"className":2344,"style":1016},[377],[42,2346,2347,2350],{"style":1059},[42,2348],{"className":2349,"style":386},[385],[42,2351,2353],{"className":2352},[390,391,392,393],[42,2354,2356,2359,2362],{"className":2355},[85,393],[42,2357,748],{"className":2358},[85,86,393],[42,2360,779],{"className":2361},[418,393],[42,2363,729],{"className":2364},[85,393],[42,2366,401],{"className":2367},[400],[42,2369,2371],{"className":2370},[373],[42,2372,2374],{"className":2373,"style":1087},[377],[42,2375],{},[42,2377,800],{"className":2378},[912],[42,2380,737],{"className":2381,"style":924},[912,923],[15,2383,2384,2385,2519,2520,1490],{},"with ",[42,2386,2388,2414],{"className":2387},[45],[42,2389,2391],{"className":2390},[49],[51,2392,2393],{"xmlns":53},[55,2394,2395,2411],{},[58,2396,2397,2403,2405],{},[309,2398,2399,2401],{},[61,2400,103],{},[314,2402,316],{},[144,2404,146],{},[309,2406,2407,2409],{},[61,2408,103],{},[61,2410,689],{},[65,2412,2413],{"encoding":67},"N_0 = N_n",[42,2415,2417,2472],{"className":2416,"ariaHidden":72},[71],[42,2418,2420,2423,2463,2466,2469],{"className":2419},[76],[42,2421],{"className":2422,"style":354},[80],[42,2424,2426,2429],{"className":2425},[85],[42,2427,103],{"className":2428,"style":118},[85,86],[42,2430,2432],{"className":2431},[364],[42,2433,2435,2455],{"className":2434},[368,369],[42,2436,2438,2452],{"className":2437},[373],[42,2439,2441],{"className":2440,"style":378},[377],[42,2442,2443,2446],{"style":1059},[42,2444],{"className":2445,"style":386},[385],[42,2447,2449],{"className":2448},[390,391,392,393],[42,2450,316],{"className":2451},[85,393],[42,2453,401],{"className":2454},[400],[42,2456,2458],{"className":2457},[373],[42,2459,2461],{"className":2460,"style":408},[377],[42,2462],{},[42,2464],{"className":2465,"style":181},[180],[42,2467,146],{"className":2468},[185],[42,2470],{"className":2471,"style":181},[180],[42,2473,2475,2478],{"className":2474},[76],[42,2476],{"className":2477,"style":354},[80],[42,2479,2481,2484],{"className":2480},[85],[42,2482,103],{"className":2483,"style":118},[85,86],[42,2485,2487],{"className":2486},[364],[42,2488,2490,2511],{"className":2489},[368,369],[42,2491,2493,2508],{"className":2492},[373],[42,2494,2497],{"className":2495,"style":2496},[377],"height:0.1514em;",[42,2498,2499,2502],{"style":1059},[42,2500],{"className":2501,"style":386},[385],[42,2503,2505],{"className":2504},[390,391,392,393],[42,2506,689],{"className":2507},[85,86,393],[42,2509,401],{"className":2510},[400],[42,2512,2514],{"className":2513},[373],[42,2515,2517],{"className":2516,"style":408},[377],[42,2518],{}," and ",[42,2521,2523,2555],{"className":2522},[45],[42,2524,2526],{"className":2525},[49],[51,2527,2528],{"xmlns":53},[55,2529,2530,2552],{},[58,2531,2532,2544,2546],{},[309,2533,2534,2536],{},[61,2535,103],{},[58,2537,2538,2540,2542],{},[61,2539,689],{},[144,2541,319],{},[314,2543,729],{},[144,2545,146],{},[309,2547,2548,2550],{},[61,2549,103],{},[314,2551,729],{},[65,2553,2554],{"encoding":67},"N_{n+1} = N_1",[42,2556,2558,2622],{"className":2557,"ariaHidden":72},[71],[42,2559,2561,2564,2613,2616,2619],{"className":2560},[76],[42,2562],{"className":2563,"style":1556},[80],[42,2565,2567,2570],{"className":2566},[85],[42,2568,103],{"className":2569,"style":118},[85,86],[42,2571,2573],{"className":2572},[364],[42,2574,2576,2605],{"className":2575},[368,369],[42,2577,2579,2602],{"className":2578},[373],[42,2580,2582],{"className":2581,"style":378},[377],[42,2583,2584,2587],{"style":1059},[42,2585],{"className":2586,"style":386},[385],[42,2588,2590],{"className":2589},[390,391,392,393],[42,2591,2593,2596,2599],{"className":2592},[85,393],[42,2594,689],{"className":2595},[85,86,393],[42,2597,319],{"className":2598},[418,393],[42,2600,729],{"className":2601},[85,393],[42,2603,401],{"className":2604},[400],[42,2606,2608],{"className":2607},[373],[42,2609,2611],{"className":2610,"style":1087},[377],[42,2612],{},[42,2614],{"className":2615,"style":181},[180],[42,2617,146],{"className":2618},[185],[42,2620],{"className":2621,"style":181},[180],[42,2623,2625,2628],{"className":2624},[76],[42,2626],{"className":2627,"style":354},[80],[42,2629,2631,2634],{"className":2630},[85],[42,2632,103],{"className":2633,"style":118},[85,86],[42,2635,2637],{"className":2636},[364],[42,2638,2640,2660],{"className":2639},[368,369],[42,2641,2643,2657],{"className":2642},[373],[42,2644,2646],{"className":2645,"style":378},[377],[42,2647,2648,2651],{"style":1059},[42,2649],{"className":2650,"style":386},[385],[42,2652,2654],{"className":2653},[390,391,392,393],[42,2655,729],{"className":2656},[85,393],[42,2658,401],{"className":2659},[400],[42,2661,2663],{"className":2662},[373],[42,2664,2666],{"className":2665,"style":408},[377],[42,2667],{},[10,2669,2671],{"id":2670},"planimetric-perimeter-and-polyline-closure","Planimetric Perimeter and Polyline Closure",[15,2673,2674,2675,2703,2704,2519,2884,3109],{},"Perimeter (",[42,2676,2678,2691],{"className":2677},[45],[42,2679,2681],{"className":2680},[49],[51,2682,2683],{"xmlns":53},[55,2684,2685,2689],{},[58,2686,2687],{},[61,2688,1826],{},[65,2690,1826],{"encoding":67},[42,2692,2694],{"className":2693,"ariaHidden":72},[71],[42,2695,2697,2700],{"className":2696},[76],[42,2698],{"className":2699,"style":81},[80],[42,2701,1826],{"className":2702,"style":1847},[85,86],") is the sum of horizontal Euclidean distances between consecutive vertices, including the closing leg from the last vertex back to the first. 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},[725,7851,7852,7854],{},[314,7853,729],{},[314,7855,732],{},[58,7857,7858,7860,7862,7864,7866],{},[144,7859,737],{"fence":72},[314,7861,7280],{},[144,7863,779],{},[314,7865,7285],{},[144,7867,737],{"fence":72},[144,7869,146],{},[314,7871,7872],{},"1325.000",[3161,7874,7875,7879],{},[7876,7877,7878],"mtext",{}," m",[314,7880,732],{},[65,7882,7883],{"encoding":67},"A = \\frac{1}{2} \\left| 3650.000 - 1000.000 \\right| = 1325.000 \\text{ m}^2",[42,7885,7887,7905,8015],{"className":7886,"ariaHidden":72},[71],[42,7888,7890,7893,7896,7899,7902],{"className":7889},[76],[42,7891],{"className":7892,"style":81},[80],[42,7894,589],{"className":7895},[85,86],[42,7897],{"className":7898,"style":181},[180],[42,7900,146],{"className":7901},[185],[42,7903],{"className":7904,"style":181},[180],[42,7906,7908,7911,7979,7982,8006,8009,8012],{"className":7907},[76],[42,7909],{"className":7910,"style":833},[80],[42,7912,7914,7917,7976],{"className":7913},[85],[42,7915],{"className":7916},[840,841],[42,7918,7920],{"className":7919},[725],[42,7921,7923,7968],{"className":7922},[368,369],[42,7924,7926,7965],{"className":7925},[373],[42,7927,7929,7943,7951],{"className":7928,"style":854},[377],[42,7930,7931,7934],{"style":857},[42,7932],{"className":7933,"style":861},[385],[42,7935,7937],{"className":7936},[390,391,392,393],[42,7938,7940],{"className":7939},[85,393],[42,7941,732],{"className":7942},[85,393],[42,7944,7945,7948],{"style":873},[42,7946],{"className":7947,"style":861},[385],[42,7949],{"className":7950,"style":881},[880],[42,7952,7953,7956],{"style":884},[42,7954],{"className":7955,"style":861},[385],[42,7957,7959],{"className":7958},[390,391,392,393],[42,7960,7962],{"className":7961},[85,393],[42,7963,729],{"className":7964},[85,393],[42,7966,401],{"className":7967},[400],[42,7969,7971],{"className":7970},[373],[42,7972,7974],{"className":7973,"style":906},[377],[42,7975],{},[42,7977],{"className":7978},[912,841],[42,7980],{"className":7981,"style":203},[180],[42,7983,7985,7988,7991,7994,7997,8000,8003],{"className":7984},[919],[42,7986,737],{"className":7987,"style":924},[840,923],[42,7989,7280],{"className":7990},[85],[42,7992],{"className":7993,"style":414},[180],[42,7995,779],{"className":7996},[418],[42,7998],{"className":7999,"style":414},[180],[42,8001,7285],{"className":8002},[85],[42,8004,737],{"className":8005,"style":924},[912,923],[42,8007],{"className":8008,"style":181},[180],[42,8010,146],{"className":8011},[185],[42,8013],{"className":8014,"style":181},[180],[42,8016,8018,8022,8025],{"className":8017},[76],[42,8019],{"className":8020,"style":8021},[80],"height:0.8141em;",[42,8023,7872],{"className":8024},[85],[42,8026,8028,8035],{"className":8027},[85],[42,8029,8032],{"className":8030},[85,8031],"text",[42,8033,7878],{"className":8034},[85],[42,8036,8038],{"className":8037},[364],[42,8039,8041],{"className":8040},[368],[42,8042,8044],{"className":8043},[373],[42,8045,8047],{"className":8046,"style":8021},[377],[42,8048,8049,8052],{"style":5817},[42,8050],{"className":8051,"style":386},[385],[42,8053,8055],{"className":8054},[390,391,392,393],[42,8056,732],{"className":8057},[85,393],[15,8059,8060],{},"In hectares:",[15,8062,8063],{},[42,8064,8066,8089],{"className":8065},[45],[42,8067,8069],{"className":8068},[49],[51,8070,8071],{"xmlns":53},[55,8072,8073,8086],{},[58,8074,8075,8078,8080,8083],{},[7876,8076,8077],{},"Area",[144,8079,146],{},[314,8081,8082],{},"0.1325",[7876,8084,8085],{}," ha",[65,8087,8088],{"encoding":67},"\\text{Area} = 0.1325 \\text{ ha}",[42,8090,8092,8113],{"className":8091,"ariaHidden":72},[71],[42,8093,8095,8098,8104,8107,8110],{"className":8094},[76],[42,8096],{"className":8097,"style":81},[80],[42,8099,8101],{"className":8100},[85,8031],[42,8102,8077],{"className":8103},[85],[42,8105],{"className":8106,"style":181},[180],[42,8108,146],{"className":8109},[185],[42,8111],{"className":8112,"style":181},[180],[42,8114,8116,8119,8122],{"className":8115},[76],[42,8117],{"className":8118,"style":195},[80],[42,8120,8082],{"className":8121},[85],[42,8123,8125],{"className":8124},[85,8031],[42,8126,8085],{"className":8127},[85],[15,8129,8130],{},"Perimeter:",[15,8132,8133],{},[42,8134,8136,8176],{"className":8135},[45],[42,8137,8139],{"className":8138},[49],[51,8140,8141],{"xmlns":53},[55,8142,8143,8173],{},[58,8144,8145,8147,8149,8151,8153,8155,8157,8159,8161,8163,8165,8167,8169,8171],{},[61,8146,1826],{},[144,8148,146],{},[314,8150,7177],{},[144,8152,319],{},[314,8154,7177],{},[144,8156,319],{},[314,8158,7221],{},[144,8160,319],{},[314,8162,7241],{},[144,8164,319],{},[314,8166,7167],{},[144,8168,146],{},[314,8170,7290],{},[7876,8172,7878],{},[65,8174,8175],{"encoding":67},"P = 31.623 + 31.623 + 26.926 + 25.000 + 30.000 = 145.172 \\text{ m}",[42,8177,8179,8197,8216,8234,8252,8270,8288],{"className":8178,"ariaHidden":72},[71],[42,8180,8182,8185,8188,8191,8194],{"className":8181},[76],[42,8183],{"className":8184,"style":81},[80],[42,8186,1826],{"className":8187,"style":1847},[85,86],[42,8189],{"className":8190,"style":181},[180],[42,8192,146],{"className":8193},[185],[42,8195],{"className":8196,"style":181},[180],[42,8198,8200,8204,8207,8210,8213],{"className":8199},[76],[42,8201],{"className":8202,"style":8203},[80],"height:0.7278em;vertical-align:-0.0833em;",[42,8205,7177],{"className":8206},[85],[42,8208],{"className":8209,"style":414},[180],[42,8211,319],{"className":8212},[418],[42,8214],{"className":8215,"style":414},[180],[42,8217,8219,8222,8225,8228,8231],{"className":8218},[76],[42,8220],{"className":8221,"style":8203},[80],[42,8223,7177],{"className":8224},[85],[42,8226],{"className":8227,"style":414},[180],[42,8229,319],{"className":8230},[418],[42,8232],{"className":8233,"style":414},[180],[42,8235,8237,8240,8243,8246,8249],{"className":8236},[76],[42,8238],{"className":8239,"style":8203},[80],[42,8241,7221],{"className":8242},[85],[42,8244],{"className":8245,"style":414},[180],[42,8247,319],{"className":8248},[418],[42,8250],{"className":8251,"style":414},[180],[42,8253,8255,8258,8261,8264,8267],{"className":8254},[76],[42,8256],{"className":8257,"style":8203},[80],[42,8259,7241],{"className":8260},[85],[42,8262],{"className":8263,"style":414},[180],[42,8265,319],{"className":8266},[418],[42,8268],{"className":8269,"style":414},[180],[42,8271,8273,8276,8279,8282,8285],{"className":8272},[76],[42,8274],{"className":8275,"style":4471},[80],[42,8277,7167],{"className":8278},[85],[42,8280],{"className":8281,"style":181},[180],[42,8283,146],{"className":8284},[185],[42,8286],{"className":8287,"style":181},[180],[42,8289,8291,8294,8297],{"className":8290},[76],[42,8292],{"className":8293,"style":4471},[80],[42,8295,7290],{"className":8296},[85],[42,8298,8300],{"className":8299},[85,8031],[42,8301,7878],{"className":8302},[85],[15,8304,8305,8306,8308],{},"Enter the local coordinates into the ",[19,8307,22],{"href":21}," in vertex order to verify these results.",[10,8310,8312],{"id":8311},"accuracy-pitfalls-and-common-errors","Accuracy, Pitfalls, and Common Errors",[15,8314,8315],{},"The Shoelace algorithm is elegant, but field and office practice requires managing several operational risks.",[8317,8318,8320],"h3",{"id":8319},"coordinate-precision-and-catastrophic-cancellation","Coordinate precision and catastrophic cancellation",[15,8322,8323,8324,4653,8388,8458,8459,1490],{},"Projected coordinates often use large magnitudes (e.g. ",[42,8325,8327,8347],{"className":8326},[45],[42,8328,8330],{"className":8329},[49],[51,8331,8332],{"xmlns":53},[55,8333,8334,8344],{},[58,8335,8336,8338,8341],{},[61,8337,63],{},[144,8339,8340],{},"≈",[314,8342,8343],{},"500,000",[65,8345,8346],{"encoding":67},"E \\approx 500{,}000",[42,8348,8350,8368],{"className":8349,"ariaHidden":72},[71],[42,8351,8353,8356,8359,8362,8365],{"className":8352},[76],[42,8354],{"className":8355,"style":81},[80],[42,8357,63],{"className":8358,"style":87},[85,86],[42,8360],{"className":8361,"style":181},[180],[42,8363,8340],{"className":8364},[185],[42,8366],{"className":8367,"style":181},[180],[42,8369,8371,8374,8378,8384],{"className":8370},[76],[42,8372],{"className":8373,"style":4638},[80],[42,8375,8377],{"className":8376},[85],"500",[42,8379,8381],{"className":8380},[85],[42,8382,1225],{"className":8383},[1327],[42,8385,8387],{"className":8386},[85],"000",[42,8389,8391,8410],{"className":8390},[45],[42,8392,8394],{"className":8393},[49],[51,8395,8396],{"xmlns":53},[55,8397,8398,8407],{},[58,8399,8400,8402,8404],{},[61,8401,103],{},[144,8403,8340],{},[314,8405,8406],{},"5,000,000",[65,8408,8409],{"encoding":67},"N \\approx 5{,}000{,}000",[42,8411,8413,8431],{"className":8412,"ariaHidden":72},[71],[42,8414,8416,8419,8422,8425,8428],{"className":8415},[76],[42,8417],{"className":8418,"style":81},[80],[42,8420,103],{"className":8421,"style":118},[85,86],[42,8423],{"className":8424,"style":181},[180],[42,8426,8340],{"className":8427},[185],[42,8429],{"className":8430,"style":181},[180],[42,8432,8434,8437,8440,8446,8449,8455],{"className":8433},[76],[42,8435],{"className":8436,"style":4638},[80],[42,8438,5323],{"className":8439},[85],[42,8441,8443],{"className":8442},[85],[42,8444,1225],{"className":8445},[1327],[42,8447,8387],{"className":8448},[85],[42,8450,8452],{"className":8451},[85],[42,8453,1225],{"className":8454},[1327],[42,8456,8387],{"className":8457},[85]," m). In floating-point arithmetic, subtracting two large, nearly equal products to obtain a small area can lose significant digits — ",[448,8460,8461],{},"catastrophic cancellation",[15,8463,8464,8465,2519,8549,8633],{},"Professional practice translates vertices to a local origin before area computation: subtract ",[42,8466,8468,8488],{"className":8467},[45],[42,8469,8471],{"className":8470},[49],[51,8472,8473],{"xmlns":53},[55,8474,8475,8485],{},[58,8476,8477],{},[309,8478,8479,8481,8483],{},[61,8480,63],{},[61,8482,5516],{},[144,8484,155],{},[65,8486,8487],{"encoding":67},"E_{\\min}",[42,8489,8491],{"className":8490,"ariaHidden":72},[71],[42,8492,8494,8497],{"className":8493},[76],[42,8495],{"className":8496,"style":354},[80],[42,8498,8500,8503],{"className":8499},[85],[42,8501,63],{"className":8502,"style":87},[85,86],[42,8504,8506],{"className":8505},[364],[42,8507,8509,8541],{"className":8508},[368,369],[42,8510,8512,8538],{"className":8511},[373],[42,8513,8515],{"className":8514,"style":5553},[377],[42,8516,8517,8520],{"style":381},[42,8518],{"className":8519,"style":386},[385],[42,8521,8523],{"className":8522},[390,391,392,393],[42,8524,8526],{"className":8525},[85,393],[42,8527,8529,8532,8535],{"className":8528},[207,393],[42,8530,5571],{"className":8531},[393],[42,8533,748],{"className":8534},[393],[42,8536,689],{"className":8537},[393],[42,8539,401],{"className":8540},[400],[42,8542,8544],{"className":8543},[373],[42,8545,8547],{"className":8546,"style":408},[377],[42,8548],{},[42,8550,8552,8572],{"className":8551},[45],[42,8553,8555],{"className":8554},[49],[51,8556,8557],{"xmlns":53},[55,8558,8559,8569],{},[58,8560,8561],{},[309,8562,8563,8565,8567],{},[61,8564,103],{},[61,8566,5516],{},[144,8568,155],{},[65,8570,8571],{"encoding":67},"N_{\\min}",[42,8573,8575],{"className":8574,"ariaHidden":72},[71],[42,8576,8578,8581],{"className":8577},[76],[42,8579],{"className":8580,"style":354},[80],[42,8582,8584,8587],{"className":8583},[85],[42,8585,103],{"className":8586,"style":118},[85,86],[42,8588,8590],{"className":8589},[364],[42,8591,8593,8625],{"className":8592},[368,369],[42,8594,8596,8622],{"className":8595},[373],[42,8597,8599],{"className":8598,"style":5553},[377],[42,8600,8601,8604],{"style":1059},[42,8602],{"className":8603,"style":386},[385],[42,8605,8607],{"className":8606},[390,391,392,393],[42,8608,8610],{"className":8609},[85,393],[42,8611,8613,8616,8619],{"className":8612},[207,393],[42,8614,5571],{"className":8615},[393],[42,8617,748],{"className":8618},[393],[42,8620,689],{"className":8621},[393],[42,8623,401],{"className":8624},[400],[42,8626,8628],{"className":8627},[373],[42,8629,8631],{"className":8630,"style":408},[377],[42,8632],{},", or use the first vertex as origin. Translation is rigid — shape, area, and perimeter are unchanged — while arithmetic runs on smaller, more stable numbers. For very large grid values, translate coordinates before pasting them into the calculator.",[8317,8635,8637],{"id":8636},"bow-tie-and-self-intersecting-polygons","Bow-tie and self-intersecting polygons",[15,8639,8640,8641,8644],{},"The Shoelace formula requires a ",[448,8642,8643],{},"simple"," polygon (edges do not cross). Incorrect vertex order can produce a bow-tie shape. Signed areas of overlapping lobes partially cancel, yielding a degraded or near-zero result. Complex self-intersecting boundaries are out of scope for standard 2D area tools — validate topology in CAD\u002FGIS before calculating area.",[8317,8646,8648],{"id":8647},"spurious-vertices","Spurious vertices",[15,8650,8651],{},"Collinear or duplicate points along a straight leg do not change area materially but add computation and can contribute minor rounding noise in very large datasets.",[8317,8653,8655],{"id":8654},"measurement-error-propagation","Measurement error propagation",[15,8657,8658],{},"Coordinate uncertainties from GNSS, total stations, or low-accuracy sources propagate into area and perimeter. Perimeter is especially sensitive: every edge length is a positive root",[15,8660,8661],{},[42,8662,8664,8714],{"className":8663},[45],[42,8665,8667],{"className":8666},[49],[51,8668,8669],{"xmlns":53},[55,8670,8671,8711],{},[58,8672,8673,8679,8681],{},[309,8674,8675,8677],{},[61,8676,3128],{},[61,8678,748],{},[144,8680,146],{},[3134,8682,8683],{},[58,8684,8685,8687,8689,8691,8697,8699,8701,8703,8705],{},[144,8686,758],{"stretchy":757},[61,8688,140],{"mathvariant":139},[61,8690,63],{},[3161,8692,8693,8695],{},[144,8694,800],{"stretchy":757},[314,8696,732],{},[144,8698,319],{},[144,8700,758],{"stretchy":757},[61,8702,140],{"mathvariant":139},[61,8704,103],{},[3161,8706,8707,8709],{},[144,8708,800],{"stretchy":757},[314,8710,732],{},[65,8712,8713],{"encoding":67},"d_i = \\sqrt{(\\Delta E)^2 + (\\Delta N)^2}",[42,8715,8717,8772],{"className":8716,"ariaHidden":72},[71],[42,8718,8720,8723,8763,8766,8769],{"className":8719},[76],[42,8721],{"className":8722,"style":3209},[80],[42,8724,8726,8729],{"className":8725},[85],[42,8727,3128],{"className":8728},[85,86],[42,8730,8732],{"className":8731},[364],[42,8733,8735,8755],{"className":8734},[368,369],[42,8736,8738,8752],{"className":8737},[373],[42,8739,8741],{"className":8740,"style":1016},[377],[42,8742,8743,8746],{"style":3230},[42,8744],{"className":8745,"style":386},[385],[42,8747,8749],{"className":8748},[390,391,392,393],[42,8750,748],{"className":8751},[85,86,393],[42,8753,401],{"className":8754},[400],[42,8756,8758],{"className":8757},[373],[42,8759,8761],{"className":8760,"style":408},[377],[42,8762],{},[42,8764],{"className":8765,"style":181},[180],[42,8767,146],{"className":8768},[185],[42,8770],{"className":8771,"style":181},[180],[42,8773,8775,8778],{"className":8774},[76],[42,8776],{"className":8777,"style":3266},[80],[42,8779,8781],{"className":8780},[85,3270],[42,8782,8784,8899],{"className":8783},[368,369],[42,8785,8787,8896],{"className":8786},[373],[42,8788,8790,8884],{"className":8789,"style":3280},[377],[42,8791,8793,8796],{"className":8792,"style":3285},[3284],[42,8794],{"className":8795,"style":3289},[385],[42,8797,8799,8802,8805,8808,8837,8840,8843,8846,8849,8852,8855],{"className":8798,"style":3293},[85],[42,8800,758],{"className":8801},[840],[42,8803,140],{"className":8804},[85],[42,8806,63],{"className":8807,"style":87},[85,86],[42,8809,8811,8814],{"className":8810},[912],[42,8812,800],{"className":8813},[912],[42,8815,8817],{"className":8816},[364],[42,8818,8820],{"className":8819},[368],[42,8821,8823],{"className":8822},[373],[42,8824,8826],{"className":8825,"style":3413},[377],[42,8827,8828,8831],{"style":3416},[42,8829],{"className":8830,"style":386},[385],[42,8832,8834],{"className":8833},[390,391,392,393],[42,8835,732],{"className":8836},[85,393],[42,8838],{"className":8839,"style":414},[180],[42,8841,319],{"className":8842},[418],[42,8844],{"className":8845,"style":414},[180],[42,8847,758],{"className":8848},[840],[42,8850,140],{"className":8851},[85],[42,8853,103],{"className":8854,"style":118},[85,86],[42,8856,8858,8861],{"className":8857},[912],[42,8859,800],{"className":8860},[912],[42,8862,8864],{"className":8863},[364],[42,8865,8867],{"className":8866},[368],[42,8868,8870],{"className":8869},[373],[42,8871,8873],{"className":8872,"style":3413},[377],[42,8874,8875,8878],{"style":3416},[42,8876],{"className":8877,"style":386},[385],[42,8879,8881],{"className":8880},[390,391,392,393],[42,8882,732],{"className":8883},[85,393],[42,8885,8886,8889],{"style":3567},[42,8887],{"className":8888,"style":3289},[385],[42,8890,8892],{"className":8891,"style":3575},[3574],[3577,8893,8894],{"xmlns":3579,"width":3580,"height":3581,"viewBox":3582,"preserveAspectRatio":3583},[3585,8895],{"d":3587},[42,8897,401],{"className":8898},[400],[42,8900,8902],{"className":8901},[373],[42,8903,8905],{"className":8904,"style":3597},[377],[42,8906],{},[15,8908,8909],{},"so random noise at intermediate vertices along a straight line can inflate total perimeter. Filter redundant vertices on straight segments when perimeter accuracy matters.",[8317,8911,8913],{"id":8912},"common-errors-summary","Common errors summary",[534,8915,8916,8932],{},[537,8917,8918],{},[540,8919,8920,8923,8926,8929],{},[543,8921,8922],{},"Error type",[543,8924,8925],{},"Mechanism",[543,8927,8928],{},"Impact",[543,8930,8931],{},"Prevention",[556,8933,8934,8948,9095,9109],{},[540,8935,8936,8939,8942,8945],{},[561,8937,8938],{},"Out-of-order vertices",[561,8940,8941],{},"Scrambled sequence → crossings",[561,8943,8944],{},"Near-zero or wrong area; spurious perimeter chords",[561,8946,8947],{},"Sort vertices sequentially around the boundary",[540,8949,8950,8953,8956,8959],{},[561,8951,8952],{},"Missing closing leg",[561,8954,8955],{},"Final edge omitted",[561,8957,8958],{},"Incomplete area and perimeter",[561,8960,8961,8962,9094],{},"Use implicit closure (",[42,8963,8965,8990],{"className":8964},[45],[42,8966,8968],{"className":8967},[49],[51,8969,8970],{"xmlns":53},[55,8971,8972,8988],{},[58,8973,8974,8980,8982],{},[309,8975,8976,8978],{},[61,8977,1826],{},[61,8979,689],{},[144,8981,4308],{},[309,8983,8984,8986],{},[61,8985,1826],{},[314,8987,729],{},[65,8989,4317],{"encoding":67},[42,8991,8993,9048],{"className":8992,"ariaHidden":72},[71],[42,8994,8996,8999,9039,9042,9045],{"className":8995},[76],[42,8997],{"className":8998,"style":354},[80],[42,9000,9002,9005],{"className":9001},[85],[42,9003,1826],{"className":9004,"style":1847},[85,86],[42,9006,9008],{"className":9007},[364],[42,9009,9011,9031],{"className":9010},[368,369],[42,9012,9014,9028],{"className":9013},[373],[42,9015,9017],{"className":9016,"style":2496},[377],[42,9018,9019,9022],{"style":1862},[42,9020],{"className":9021,"style":386},[385],[42,9023,9025],{"className":9024},[390,391,392,393],[42,9026,689],{"className":9027},[85,86,393],[42,9029,401],{"className":9030},[400],[42,9032,9034],{"className":9033},[373],[42,9035,9037],{"className":9036,"style":408},[377],[42,9038],{},[42,9040],{"className":9041,"style":181},[180],[42,9043,4308],{"className":9044},[185],[42,9046],{"className":9047,"style":181},[180],[42,9049,9051,9054],{"className":9050},[76],[42,9052],{"className":9053,"style":354},[80],[42,9055,9057,9060],{"className":9056},[85],[42,9058,1826],{"className":9059,"style":1847},[85,86],[42,9061,9063],{"className":9062},[364],[42,9064,9066,9086],{"className":9065},[368,369],[42,9067,9069,9083],{"className":9068},[373],[42,9070,9072],{"className":9071,"style":378},[377],[42,9073,9074,9077],{"style":1862},[42,9075],{"className":9076,"style":386},[385],[42,9078,9080],{"className":9079},[390,391,392,393],[42,9081,729],{"className":9082},[85,393],[42,9084,401],{"className":9085},[400],[42,9087,9089],{"className":9088},[373],[42,9090,9092],{"className":9091,"style":408},[377],[42,9093],{},") or duplicate first vertex",[540,9096,9097,9100,9103,9106],{},[561,9098,9099],{},"Units mix-up",[561,9101,9102],{},"Feet vs metres mismatch",[561,9104,9105],{},"Area scaled by wrong factor",[561,9107,9108],{},"Confirm CRS units before calculation",[540,9110,9111,9114,9117,9120],{},[561,9112,9113],{},"Catastrophic cancellation",[561,9115,9116],{},"Large coordinates without translation",[561,9118,9119],{},"Noisy or wrong least significant digits",[561,9121,9122],{},"Shift to a local origin first",[10,9124,9126],{"id":9125},"integration-with-cad-and-gis-workflows","Integration with CAD and GIS Workflows",[15,9128,9129,9130,9134],{},"CAD (Civil 3D, MicroStation) and GIS (ArcGIS, QGIS) apply the same underlying math when reporting closed-polygon area and length from vertex arrays. Spatial databases enforce validity: OGC simple-feature rules require non-self-intersecting boundaries. PostGIS functions such as ",[9131,9132,9133],"code",{},"ST_IsValid(geom)"," detect bow-ties; repair tools decompose invalid geometry into valid parts. If the path is self-intersecting, the reported area is not trustworthy.",[10,9136,9138],{"id":9137},"next-steps","Next Steps",[15,9140,9141,9142,9144,9145,9197],{},"Planimetric area and perimeter underpin boundary surveying, land development, and civil design. Understanding the Shoelace formula, winding order, coordinate translation, and topological validity prevents costly errors. To calculate or verify values from field coordinates, use the ",[19,9143,22],{"href":21}," — ordered ",[42,9146,9148,9170],{"className":9147},[45],[42,9149,9151],{"className":9150},[49],[51,9152,9153],{"xmlns":53},[55,9154,9155,9167],{},[58,9156,9157,9159,9161,9163,9165],{},[144,9158,758],{"stretchy":757},[61,9160,63],{},[144,9162,1225],{"separator":72},[61,9164,103],{},[144,9166,800],{"stretchy":757},[65,9168,9169],{"encoding":67},"(E, N)",[42,9171,9173],{"className":9172,"ariaHidden":72},[71],[42,9174,9176,9179,9182,9185,9188,9191,9194],{"className":9175},[76],[42,9177],{"className":9178,"style":604},[80],[42,9180,758],{"className":9181},[840],[42,9183,63],{"className":9184,"style":87},[85,86],[42,9186,1225],{"className":9187},[1327],[42,9189],{"className":9190,"style":203},[180],[42,9192,103],{"className":9193,"style":118},[85,86],[42,9195,800],{"className":9196},[912]," vertices, implicit closure, absolute area, and summed perimeter.",{"title":9199,"searchDepth":9200,"depth":9200,"links":9201},"",2,[9202,9203,9204,9205,9206,9207,9208,9209,9217,9218],{"id":12,"depth":9200,"text":13},{"id":26,"depth":9200,"text":27},{"id":36,"depth":9200,"text":37},{"id":442,"depth":9200,"text":443},{"id":667,"depth":9200,"text":668},{"id":2670,"depth":9200,"text":2671},{"id":4507,"depth":9200,"text":4508},{"id":8311,"depth":9200,"text":8312,"children":9210},[9211,9213,9214,9215,9216],{"id":8319,"depth":9212,"text":8320},3,{"id":8636,"depth":9212,"text":8637},{"id":8647,"depth":9212,"text":8648},{"id":8654,"depth":9212,"text":8655},{"id":8912,"depth":9212,"text":8913},{"id":9125,"depth":9200,"text":9126},{"id":9137,"depth":9200,"text":9138},"tools","Planimetric area and perimeter from ordered E\u002FN vertices — the Shoelace formula, winding order, worked example, and common pitfalls.","md",{},true,4,"\u002Flearn\u002Ftools\u002Fpolygon-area",{"title":5,"description":9220},{"loc":9225},"learn\u002Ftools\u002Fpolygon-area","H0VqrJsWEARggn-PL4vbZ1FO7ikSDJoBBsPvuftrS6o",[9231,9236],{"title":9232,"path":9233,"stem":9234,"description":9235,"category":9219,"children":-1},"Tienstra Resection","\u002Flearn\u002Ftools\u002Ftienstra-resection","learn\u002Ftools\u002Ftienstra-resection","Three-point angular resection — Tienstra barycentric method, danger circle, field practice, worked example, and verification.",{"title":9237,"path":9238,"stem":9239,"description":9240,"category":9219,"children":-1},"File Conversion Overview","\u002Flearn\u002Ftools\u002Ffile-conversion-overview","learn\u002Ftools\u002Ffile-conversion-overview","Browser-native GSI, CSV, and DXF conversion — survey workflows, USDM v1, client-side privacy, and quality checks.",1783851946408]