Positive Calculation of Area by Coordinates

by Francis E. Griggs, Jr.,

Serial Information: Journal of the Surveying and Mapping Division, 1967, Vol. 93, Issue 1, Pg. 1-4

Document Type: Journal Paper


The area enclosed by a multisided polygon can be determined once the coordinates of the polygon points are known. By the use of Green's theorem a method is obtained which results in a formula for area calculation by coordinates that always results in a positive value for the area. Most surveying texts give formulas that result in a negative value for area. Rules are given that assure a positive-valued area.

Subject Headings: Geomatic surveys

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