Display error using external DEM:CG overhead limit exceeded

Microwave Toolbox
#1

Hi, I use external DEM when processing Iceland data, but I don’t know why the following error occurred.
Display as CG overhead limit exceeded

DEM website:ArcticDEM – Polar Geospatial Center

#2

A common error with Java is “GC overhead limit exceeded”, which mean the system is spending too much time on garbage collection without actually reclaiming much memory. “CG” may be a localized version of “GC”. You didn’t mention details of the ArticDEM you are using (strip versus tiles, resolution). The full 2 meter ArcticDEM is big (and was produced using a supercomputer), so there may be an issue with selecting a subset suitable for your region of interest on a smaller system.

ArcticDEM Explorer allows you to export data.

#4

I use these DEMs

$NEHI7`6T{}}2%ZMK){)BR0
$NEHI7`6T{}}2%ZMK){)BR01683×434 23.5 KB

Do I need to preprocess these Dems to use?
I’ve tried many Dems and haven’t found the right one yet

#5

So you are using 2m resolution, so multiple TB per tile, which needs careful memory management to use on a typical desktop. Do those 4 tiles cover you ROI?

Your options are to reduce the resolution or cut out just the parts of each tile you need.
You can try creating a small DEM using subset on each of the tiles, then mosaic to get a reduced resolution DEM for your region.