“Using Multi-million dollar satellites to find
tupperware containers in the woods.”--nucci6

Step Two - Rendering the Topographic Data

Last Updated September 12, 2009

This process will take some time so don't be surprised if it takes a few hours to completely render the topographic data from the GeoTiff file you downloaded. This procedure assumes you've already expanded the zip file from the dem2topo site, installed the IDL software, and expanded the GeoTiff zip file. The procedure will create a .mp file based upon the original file's name. To keep my files organized, I rename them to the upper left corner's GPS coordinate (ex. 42007800.tif for N 42 and W 78).

  1. Open the dem2topo application by double clicking on the dem2topo.sav.
  2. You should see an IDL Splash Screen, just click on the Click to Continue.
  3. If this is the first time you are running this application you will need to set some defaults:
    1. Change the interval from meters to feet.
    2. Change the Major Interval to 500 so that it will create a heavy contour line every 500 feet.
    3. Change the Intermediate Interval to 100 so that it will create a medium contour line every 100 feet.
    4. Change the Minor Interval to 20 so that it will create the minor contour lines every 20 feet.
  4. Click on the Select DEM File(s) to select the GeoTiff(s) to be rendered. Highlight the file(s) and click on the Open button.
  5. Click on the Create .mp file(s) button.
  6. When the application has finished rendering the data, it will notify you with a dialogue box. Click on the OK button to close the dialoge.
Proceed to Step 3.

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