Convert ascii to DEM

JSL

Hi, I'm trying to import a large xyz file from this site: http://geomag.org/models/wdmam.html in order to create a DEM that looks like the image at the top of the webpage:




I have no experience in this, however, and these are huge files--when I downloaded the fourth file down on the list, the zipped xyz file, it translated to over 25 million points.  I tried to batch convert it to a USGS DEM file, but it failed to create anything.

Any help would be appreciated...

geomannie

You can open ascii files, either zipped or unzipped. but the data must be in either X, Y, Z or Y, X, Z format.

• Go to file "open generic acsii text file"
• Select your file. OK, and tick "elevation grid from 3D point data"
• Also select Y or Y as first coordinate
  
• Make sure that the box "treat 3rd coordinate as elevation" is ticked
• Hit OK and select tight or loose distance criteria (suggest trying to see which gives you the best result)
• Select projection
• That's it

I hope that this helps.

Cheers

JSL

Thanks, that worked beautifully!