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Surfer - Replace Blanked Nodes with 0

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A customer writes:

Q. How do I fill the blanked nodes in a GTOPO30 DEM file with zeros for use with ArcView?

A. Choose the Grid | Filter menu command, specify the DEM file name, and click Open. In the Digital Filtering dialog, change the filter to Linear Convolution Filters | User Defined Filters | General User Defined (mxn), change the Blanked Nodes to Fill and Value to 0, and specify a new output GRD file name. Open the GRD file with Map | Image Map or use it with any operation that uses a GRD file.

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