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You could try and pull up a land use land cover database of your area where that code 0 is located in. It should be the similar one like this http://landcover.usgs.gov/landcoverdata.php but see if you have one the most recent current land use land cover of your area.


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Further to Jeffrey Evans' answer, you could use PDAL to classify the ground points. It's a little harder to get started (on Windows, anyway) but it's free and makes high-volume batch-processing a cinch.


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If the class codes field is not populated there is no way to obtain them. During pre-processing the vendor did not classify the points so, you are functionally dealing with a raw point cloud. Unfortunately, this means that you need to start researching methods for classifying the point cloud yourself. Since you did not provide any context I cannot aim you ...


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There are plenty of ways to create a DTM/DSM in both programs. All tools are good, but can be tweaked to give you results based on your precise needs - of which you haven't included any - in your question. Take a look at these tools, all of which were also discussed on gis.stackexchange, to find the one to best fit your needs ArcGIS - Topo to Raster QGIS ...



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