Community 3.3.6

[George Holmes]

Community, I have a quick question, why some features have been incorrectly removed while extracting the DTM?

feel free to drop in your suggestions.

thanks,

[David Alamillo]

Hi George,

I would be happy to assist. There are situations for which it can be difficult for the software to correctly identify features vs. ground. In such cases, consider doing the following:

1) When extracting the DTM, use an exclusion zone defined through a Shapefile (vector) file for the region you want to leave intact. This will prevent the software from modifying that region. An easy way to define an exclusion zone is by using the DEM Editing functionality. Simply perform a selection around the region, and save this selection using the corresponding button in the side toolbar. This selection can then be used as an exclusion area during DTM extraction. If several areas are required, simply save the new selection under the same filename. This will result in appending the file.

2) Some isolated erroneous elevation points in the DSM may lead to sub-optimal results during DTM extraction. In that case, simple edit the DSM before performing the extraction.