Multiple Problems with exporting Elevation Data as CVS File from a Point Grid - Global Mapper 17
In Global Mapper 17, I have been trying to export elevation data from a point grid within a polygon. I am trying to extract point elevation data from the lidar DEMs from the Louisiana Atlas GIS web site for statistical analysis. The first problem is the exported elevation attributes all came out as "-99999.99" in an area of Allen Parish, Louisiana that is between 85 and 160 feet in elevation. The other tools in Global Mapper continued to provide elevations consistent with local topographic maps. Finally, as I was working this problem, the "EXPORT - Export Selected Layer(s) to New File..." link disappeared from the menu to the point grid layer obtained by right clicking in the control center. Below is an excerpt from a csv showing anomalous elevations.