I have a large, regularly-spaced XYZ data set. What is the best way to convert it to a Surfer grid with none to minimal interpolation?

Use the Home | Grid Data | Grid Data command to create a grid from an XYZ data set. Since your data is already regularly-spaced, use the Nearest Neighbor Gridding Method and set the spacing of the output grid to match the spacing of the input data. Since the grid nodes will lie exactly on the data points, no interpolation will take place.


Updated February 7, 2017

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