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I want to extract all of my post map points within a polygon on my base layer. How can I do this?

It is not currently possible to blank a post map outside of a polygon, but there is a workaround. 

  1. Select your map.
  2. Click Home | Add to Map | Layer | Base from Data.
  3. Select the data file used to create your post map, and click Open.
  4. Set the data row and column properties in the Base from XY Data dialog, then click OK.
  5. In the Contents window, right click on the Base(vector) layer containing your points and click Start Editing.
  6. Click and drag your mouse around groups of points on the map which are outside of the polygon to mass-select them, and press DELETE on your keyboard to delete them.
  7. When all points outside of the polygon are removed, in the Contents window, right click on the Base(vector) layer containing your points and click Stop Editing.
  8. In the Contents window, uncheck the boxes next to everything except the base layer containing your points and the map containing that base layer, so only the points are visible.
  9. Click File | Export.
  10. In the Export dialog, change the Save as type to DAT XYZ (*.dat, *.txt, *.xyz), give your file a name, and click Save.
  11. In the Export Options dialog, on the Scaling page set the Scaling source to your Map.
  12. Click OK to create the DAT file.
  13. Click the File | Open command to open the DAT file in Surfer's worksheet.
  14. Select Column C and click Data | Data | Text to Number.
  15. Click File | Save to save the DAT file.

 

If you would like to add your vote to our suggestion file for a way to blank a post map outside of a polygon, contact surfersupport@goldensoftware.com

 

See also:

 

Updated October 20, 2017

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