Hi, I tried to use the masking option in NVIZ (5.7) but to no avail. In 5.0.x it was working, maybe some recent updates to either ogsf or NVIZ have disabled this functionality? Panel -> Surface -> Surface attribute -> Mask As far as I recall, a 1/NoData map could be used to mask out subregions of a map. Are there any tricks in that? Thanks Markus