GM_CalcEnclosedArea

Marius Lazar

September 02, 2026 13:17 Updated

Global Mapper SDK

Calculates the enclosed area of a list of points.

Syntax

C++

GM_Error_t32 __stdcall GM_CalcEnclosedArea
(
const GM_Point_t*       aPtList,    // IN: list of points defining area
uint32                  aNumPoints, // IN: number of points in list
const GM_Projection_t*  aProj,      // IN: projection of points in list (use NULL for current projection returned by GM_GetProjection)
double*                 aArea       // OUT: enclosed area in square meters
);

Remarks

The coordinates in aPtList are in the projection defined by aProj. If NULL is passed for aProj then the current globalprojection as returned by GM_GetProjection is assumed.