In order to extract the vegetation mask in ecognition, with object base analysis, with creation of the rule sets, the buildings were also classified! Any idea how to extract building from vegetation? I tried to use shape and also asymmetry, but other ideas are most welcome.
There are several online videos showing how to use Image Analysis with Lidar data with eCognition.
Image Classification methods are key to extracting the correct data.
Vegetation (Tree Canopy Extraction) http://www.ecognition.com/support/media-library/videos/ecognition-image-analysis-extracting-tree-canopy-lidar
If you are using ArcGIS, you could try the LP360 for ArcGIS: Classify tool.
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Each Lidar point should have multiple "returns" - the last return is likely to be either building or ground level. Previous ones are likely to be hits on vegetation such as a tree canopy. So my sense is that you could discard all but the last return as being vegetation. That might help.