Error: Empty DEM/Surface

[jbak9141]

Hi there,

I'm trying to build a DEM off an imported point cloud and am running into all varieties of the "Empty X" error (eg: "Empty Surface, Empty: DEM" etc....

The point cloud has been imported from a LAZ that was exported by a separate PhotoScan project
The chunk is referenced in the same CRS as the incoming pt cloud (EPSG:32756 in this case)
The project has been saved in a psx format pre-attempting export
The point cloud is well within the bounding box
All surface generation flows produce the same "Empty DEM/Surface" errors.

Any help would be greatly appreciated.

Cheers

J

[Alexey Pasumansky]

Hello jbak9141,

Try to use disabled interpolation to extrapolated option when building DEM.

[jbak9141]

Hello jbak9141,

Try to use disabled interpolation to extrapolated option when building DEM.

Perfect thanks Alexey, that seems to do the trick, is there any info you can offer on why extrapolated is needed? Happy to use this option going forward but it seems a little counter-intuitive when compared to operations performed on dense clouds generated by PhotoScan itself.

[Alexey Pasumansky]

Hello jbak9141,

Enabled Interpolation option is cropping the final surface according to the area visible from at least one aligned camera, if there is no camera alignment - there's no visible surface.

[jbak9141]

Hello jbak9141,

Enabled Interpolation option is cropping the final surface according to the area visible from at least one aligned camera, if there is no camera alignment - there's no visible surface.

That makes perfect sense, thanks Alexey!