Hi Rich- > Can you tell me what the highest resolution terrain data is in IDV? Whatever you load in. ;-) Usually, I use the model terrain for displays, so that's one possibility. Stu Wier put together a page on importing various topography datasets into GEON-IDV: http://geon.unavco.org/unavco/IDV_for_GEON_topo.html which includes instructions for getting some higher rez NGDC datasets in. We also support the USGS ASCII DEM datasets described at: http://rockyweb.cr.usgs.gov/nmpstds/acrodocs/dem/2DEM0198.PDF Don Ticket Details =================== Ticket ID: XKY-303835 Department: Support IDV Priority: Normal Status: Open