I have a lidar file with 5 million points for a forest region in America . I must calculate DEM . for this purpose I have to filter the other object except ground but I don't know how . then for the mature trees I must draw crest elevation . can anybody give me any information about these?
http://desktop.arcgis.com/en/arcmap/10.3/manage-data/las-dataset/a-quick-tour-of-lidar-in-arcgis.htm
https://www.esri.com/library/whitepapers/pdfs/lidar-analysis-forestry-10.pdf
You can try the LiForest , a software specifically for the analysis of forestry.
It consists of several primary modules for lidar point cloud data processing, including point cloud I/O, LiDAR data filtering, forest metric calculation, digital elevation and surface model generation, regression models, and individual tree segmentation.
Solutions:
http://greenvalleyintl.com/solutions/forest-inventory
Maybe a free solution is enough for you. I really like FUSION and I have obtained ussually metter results than using TerraScan for exampe:
http://forsys.cfr.washington.edu/fusion/fusionlatest.html
For visualization and basic managemente the FUGRO viewer and CloudCompare work fine.
Good luck
If you want to understand very well you have to start reading ground filtering algorithms. Every software has their own algorithms and probably with some differences in the final result.
LASTools is a very straightforward application with a friendly interface. Even if you would like to change some parameters concerning the terrain condition, take it done, (tile the data for covering more area). In case of paid software like ENVI you could get everything at one click, but if you want to modify, knowledge for IDL is needed or pay more :)
You may find multiple possibilities and explanation here in http://spatial-analyst.net/book/system/files/Hengl_2009_GEOSTATe2c0w.pdf
You may also follow https://www.researchgate.net/post/How_to_achieve_multi-object_segmentation_from_LiDAR_point_clouds
LiDAR is a beast of a dataset to work with. What other GIS formats have its OWN compression format (LAZ).
https://tnris.org/data-catalog/entry/lidar-availability-index/
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