I have a question concerning area calculations in South-East Asia for West-East range that goes from India to Eastern Malaysia and a North-South range from Northern India to Indonesia (xMin,yMin 74.2203,-5.89636 : xMax,yMax 118.927,30.1183). I found two projections that might be suitable for this geographical region:
- Albers Equal Area (Conical) for S-Asia (s. http://spatialreference.org/ref/esri/102028/)
and
- Pseudo/Web Mercator (EPSG:3857, s. http://spatialreference.org/ref/sr-org/7483/)
However, when I compare the results of both projections, I get large differences in total area (I used QGIS field calculator for area calculation):
- 620,589.41 km^2 for Albers Equal
and
- 689,941.23 km^2 for Pseudo Mercator
That is a difference of ard. 11%
Can anyone help me to understand the differences of these two projections and to know which one is more appropriate for my purpose?
Thanks so much in advance