Elevation Grid Combination
SimonJSO
Global Mapper User
I have two elevation grids, one large rectangle and the other a small annulus (donut shape) which is completely contained by the other's boundary. I need to combine them in a way that I map the annulus data within it's own borders, and the rectangle data everywhere else. I don't know if this makes sense, so I'll put it another way.
How do I remove a polygonal area from inside an elevation grid and/or how can I combine these two layers by using the larger area bounds as opposed to the smaller area bounds?
Sorry for the stupid question. I just started using this software.
How do I remove a polygonal area from inside an elevation grid and/or how can I combine these two layers by using the larger area bounds as opposed to the smaller area bounds?
Sorry for the stupid question. I just started using this software.
Comments
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All that you need to do is load the large rectangular grid first, then load the small annulus grid on top of that. You will automatically see the last loaded data on top. You can even smoothly blend the smaller grid into the larger one behind it by setting up Feather Blending for the layer on the Feathering tab of the Options dialog of the layer on top.
Thanks,
Mike
Global Mapper Guru
geohelp@bluemarblegeo.com
Blue Marble Geographics for Coordinate Conversion, Image Reprojection and Vector Translation -
Will that allow me to export both layers as one data file?
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Yes, just use File->Export->Export Elevation Data to export all loaded data to a single new grid file. The export will generate a result the same as what you see on the screen.
Thanks,
Mike
Global Mapper Guru
geohelp@bluemarblegeo.com
Blue Marble Geographics for Coordinate Conversion, Image Reprojection and Vector Translation
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