Global Mapper v25.0

Producing a plane that intersects / best fits 4 known points.

charlescollins83
charlescollins83 Global Mapper User
edited February 2015 in Elevation Data
Hi There, this is my first post. I need to create a plane in order to reduce a data set to local datum.

I have a DEM that is on the ellipsoid. I need to reduce it to LAT vertical datum.
The DEM covers a large area so LAT varies over the site... I have 4 n-values covering the area that give the ellipsoidal height of LAT at each position.

I need to create a plane/model that fits these 4 points. I will then surface difference between the plane/model and my DEM to reduce down to LAT.

The surface differening is ok. How can i create a plane or model with the N-value information in GM? I would thing a 25m cell spacing for the model would be sufficient. I also need the plane/model to project outward from the 4 known points.

Cheers

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