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How can I resample, resize, or crop my grid file in Surfer?

Surfer includes three ways to resize or resample a grid to a specified number of rows and columns:

 

Method 1: Use Grid Extract

    1. Click Grids | Resize | Extract, specify the input grid file and click Open to display the Extract Grid dialog.
    2. Here you can clip grid nodes off sides, top and bottom of the grid by increasing the First or decreasing the Last values, or you can filter the grid by setting the Read Every to a higher value. This method does not resample the grid file, it simply removes vertical or horizontal lines of grid nodes to resize the grid.
    3. Change the Output Grid File, if desired.
    4. Choose to Add grid as layer to:, if desired. 
    5. Click OK.

 

Method 2: Use Grid Smooth

    1. Click Grids | Edit  | Spline Smooth, specify the input grid file and click Open to display the Spline Smooth dialog. 
    2. Change the Method to Recalc Grid, change the Final Grid Size to the desired number of rows and columns. A spline method is used to recalculate the grid node values.
    3. Change the Output Grid File, if desired.
    4. Choose to Add grid as layer to:, if desired. 
    5. Click OK.  

 

Method 3: Use Grid Mosaic

    1. Click Grids | Resize | Mosaic, specify the input grid file and click Open to display the Grid Mosaic dialog. 
    2. Change the Output Grid Geometry to the desired number of rows and columns in the # of Nodes section. 
    3. Select the desired Resampling Method, either Nearest Neighbor, Bilinear Interpolation, or Cubic Convolution. In most cases, the default Bilinear Interpolation is best.
    4. Change the Output Grid File, if desired, to change the file type and name.
    5. Choose to Add grid as layer to:, if desired. 
    6. Click OK.  

 

Updated January 31, 2017

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