I've got raster with elevations of trees in a forest. I would like to find out the average tree height of all trees in a given area.
Because of the geometry of a tree top (which is like a cone and just the top is my real tree height), common statistic tools (Zonal Statistics or v.rast.stats) doesn't work for me. I need the average of the maximum values.
All trees and vegetation below 4m have no data. Even all values above 40m. The yellow area in the north-west seems to have mostly 40m heigh trees, but the statistics (median/mean) say something about 28m.
Any ideas, how to approach this task using QGIS, SAGA, GRASS?