Selv
| Category ? | Version ? | 
Description
Provided the correct GM and Omega, Selv will use SGRAV.TXT file to create the surface elevation (same as geoid).
Required Files
- SGRAV.TXT
Input stdin
- This is sometimes contained in MGRAV.IN 
- What it asks for
   GM (km^3/s^2), Omega (deg/day)
     1.728e10
     1617.250674
Output Files
- some large negative number (e.g., -65890511.606425241)
- SHAPEFILES/GEOID.TXT - gives the geoid in X, Y, Z position. A 3 column file. 
- SHAPEFILES/SHAPEC.TXT - gives the height above the surface. A 4 column file. 








