I made an elevation map of my study area in Macapa, Brazil. But the region has the average elevation lesser than 30 m as I can see from my map derived from SRTM 3 second arc.
According to my knowledge some parts of the region has trees taller than 30 meter and I am afraid that my elevation map shows tree canopy elevation instead of bare land elevation.
My questions are:
- Is any correction implemented on SRTM 3 second arc images to remove trees and non-terrain features?
- I found a tree height map from NASA. Can I do: SRTM 3 second arc minus elevation height map?