ctech_example.gmf :: Earth Volumetric Studio Helphttps://ctech.com/studio_help/file-format-details/gmf-file/ctech-example-gmf/index.htmlctech_example.gmf Database Generated GMF File (Creation at 7/22/2003 5:36:07 PM) Surface 1: 25 Coordinates Database Columns [GMF_Surface0 (Ground Surface)]: X, Y, Top surface 1 SandHugoen-us