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Specialized command for gridding sonar data or large point sets. The son without the ppg option is covered by the command grp .
The son ppg is a snapping algorithm of input points to the grid result. The algorithm will snap free point data into a grid of size nx ny. The snap gridding will make defined grid nodes of each node that is closest to an input point. If more than one point are sorted to a node, the node value will be the average of the point values. A count grid telling the number of coincident points can be generated.
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