Calculation of object area

This mode is used for polygon objects only.

The object area without taking into account its subject areas (i.e. the area of sites lying inside object and not belong to it is subtracted) is deduced into result window  after selection of the object.

On maps which scale is more 1 : 10 000 and also there is a support of geodetic coordinates, calculation of the area, lengths of the sides and perimeter is carried out in view of a projection of a map. For this purpose coordinates of object are recalculated in system 42 years to an axial meridian of the zone nearest to object. Such approach allows to compensate geometrical distortions of the sizes of object, conditioned by projection of a map. At carrying of object onto other maps with other parameters of projections the results of calculations are kept. However, at merge of several objects the total area can differ from the area of merged object if initial objects were located in different zones. Thus the error can be measured in percentages of a total area, and without taking into account a projection the calculated values can differ from real values in some times (for example, at northern latitudes of Mercator projection, etc.).