On Fri, Mar 11, 2011 at 12:25 PM, Curt, WE7U <[email protected]> wrote: > Which raster maps? USGS DRG's perhaps?
Yes, USGS DRG topos, and color aerial photos in Geotiff format. > What you can do: Set the zoom levels so that the 7.5' maps are loaded only > at the levels where you need that detail. Switch to the 1:100k maps above > that, and the 1:250k maps above that. With that scheme you can zoom in/out > much more quickly 'cuz you've got fewer maps being loaded when you're zoomed > out. I only need the 1:24k maps. When I zoom out I just use some shapefiles so I can keep oriented to where I am on the map, but primary use is tracking ground SAR crews, so I need the detail when zoomed in. > Another option: Process the DRG maps into one contiguous map using GRASS or > some other good GIS program, then break it up into smaller tiles in > "unprojected" projection. Create .geo files for each one and let Xastir > have at that. Xastir will treat it as any other raster in that case and > tile them all together as you need, but it won't have to do all the math on > it to get it into the right projection then. Good idea, thanks! I'll get with a local GIS guy and try that and report back if there's a noticeable improvement. Kevin KB9MQU _______________________________________________ Xastir mailing list [email protected] http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
