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How can I calculate slope as a percentage in Surfer?

To calculate the slope as a percentage from a grid file, follow these steps:
  1. Click Grids | Calculate | Calculus.
  2. Select the grid file and click Open.
  3. In the Grid Calculus dialog, choose Differential & Integral Operator | Gradient Operator.
  4. Specify the Output Grid file name and file path.
  5. Click OK. This creates a new grid file of the slopes. The slopes are reported as a number (rise over run). The Z value is 0 for a horizontal surface, and approaches infinity as the slope approaches vertical.
  6. To convert this to a percentage, click Grids | Calculate | Math.
  7. In the Grid Math dialog, click the Add Grids button.
  8. Select this gradient grid file and click Open.
  9. Multiply the grid by 100 by entering the function A*100.
  10. Save the file.
    1. To save the results to a data file, click the yellow Change Filename icon to the right of Output Grid. Give the file a name, and select to save it as a DAT XYZ file and click Save.
    2. To save the results to a grid file, click the yellow Change Filename icon to the right of Output Grid. Give the file a name, leave the Save as type set to GRD Surfer 7 Binary Grid, and click Save.
  11. Click OK and the file is created.

 

Updated February 9, 2017

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