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Hi Steve- > The failing DEM is at http://www.stevekaye.nadsl.net/all-data_sources.htm - > bottom of page. Thanks for the sample. Does this file load in other software? For a USGS DEM, each block should be 1024 characters and where it's failing, the block is short which is causing the problems. Just want to make sure other software handles this before I delve deeper. Thanks. Don Ticket Details =================== Ticket ID: PUJ-510012 Department: Support IDV Priority: Normal Status: Open