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Determining elevation difference between 3D Point data and elevation raster
I have a dataset of 3D point data (shapefile) that is depth soundings that run mostly in about three long lines up and down a river so they're not very dense. I have another set of soundings for the area that are dense enough to grid. I've gridded that data and am wondering if there's a way to use Global Mapper to get differences (essentially height above or below terrain) for each of the data points in the first dataset I described from the gridded dataset. I'm basically trying to determine if there's a pattern error between the two datasets in this area.