Topography Generator Not Working

Replies to This Discussion

Permalink Reply by RubenV on August 12, 2013 at 10:47am

I have the same problem, trying torepresent a path.. which is the criteria to move the Lo and La?

Permalink Reply by Timothy Logan on October 4, 2013 at 12:25pm

The latitude and longitude are too large and don't even include the range covered in the HGT file. The file's only contain 1°x1° squares, so if you need to create something that spans as much space as you're showing you would need to stitch together multiple topo's.  Plus a topo of that size would likely be very slow performing.  Assuming SRTM3 is the file type being used, the range shown in your domains is going to be close to 100 million points.

Permalink Reply by Furion Huang on August 14, 2013 at 9:51pm

I've made the topo model for Shantou, China, so it must be working.

Attachments:

• Shantou.osm, 1.3 MB
• Shantou.gh, 26 KB
• N23E116.hgt, 2.8 MB

Permalink Reply by Alex Webb on September 17, 2013 at 11:13am

what does the error message say on the sTopo module?  

Permalink Reply by Timothy Logan on October 4, 2013 at 12:19pm

Too little too late, but the problem with the original post is probably the Longitude domain and an incorrect HGT file.  HGT files are 1°x1° tiles, named according to the lower left corner.  So the HGT file loaded goes from 32° to 33° latitude, and -111° to -110° longitude.  

To get the topo specified by the latitude/longitude, you actually need N32W112.  Then the longitude domain should be from -111.167 to -111.117.  Western longitudes are negative, and eastern longitudes are positive.