I have been trying to run r.horizon on a SRTM DEM for the continental US, with no success. The operation runs for about 45 minutes then eventually just stops with no warnings or errors<br><br>I'm running GRASS 6.4-rc5 64-bit in Ubuntu 9.10 on a virtual machine (Virtual Box on Windows XP 64-bit).<br>
<br>The r.horizon function will consume as much RAM as apply to the machine, up to 6144 MB, plus an additional 4GB of swap memory. <br><br>The DEM is in Geographic coordinates - WGS 84. I tried to run r.horizon in only 1 direction with maximum distance of 5310 meters.<br>
<br>Is there a file size limitation? Or any suggestions for an optimal size?<br><br>Thanks,<br>Josh<br><br>Joshua Campbell<br>Kansas Applied Remote Sensing Program<br>University of Kansas<br>Lawrence, KS<br>