If the site file goes outside the collected data region those values get filled with nonsense (see current dems in polygon 003).
Best solution is to use density as a mask, however it should use the complete density image as a mask, because the dtm and dsm density versions could have missing values but were properly filled during the gapfill process.
So, use whole density image as a mask, but it may or may not exist as it currently is not a prerequisite to generate dems.
For performance reasons, it would be best to add the mask during or at the end of the gap-filling process.
If the site file goes outside the collected data region those values get filled with nonsense (see current dems in polygon 003).
Best solution is to use density as a mask, however it should use the complete density image as a mask, because the dtm and dsm density versions could have missing values but were properly filled during the gapfill process.
So, use whole density image as a mask, but it may or may not exist as it currently is not a prerequisite to generate dems.
For performance reasons, it would be best to add the mask during or at the end of the gap-filling process.