This question already has an answer here:
- Calculating polygon areas in QGIS? 4 answers
I have a world map divided into zones and need to compute the area for each polygon. I tried using Vector > Geometry Tools > Export/Add geometry columns and successfully get the area and perimeter but I don't know the units of this measurement.
I assumed this was in square meters because the Layer CRS is WGS84 and I have 'Units for area measurement' in Project > Project Properties set to square meters but it seemed off by couple orders of magnitude. If I assumed these measurements were in square kilometers the sum of all the areas is still off by about 20% from the earths surface area.