I'm trying to calculate a polygon area. This is the polygon and the attribute table:
When I open field calculator and use the Geometry--> area$, the area result for ID 1 is (in square meters) 1809477.67:
but when i use the
Export/Add geometry column tool, two things happen:
- a new layer been created named "added geom info"- why the data isn't created in the polygon attribute table?
- the area result is (in square meters): 1799292.92 - why I get different results?
When I measure the area in ArcGIS 10.3 - the result was 1799292.92 square meters.
I also read
How to calculate polygon areas and perimeters using QGIS?
but didn't find any suitable answer.