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How can I find the Z value of a known XY point?
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You can find the Z value of XY points within the map using one of these methods:

1. Grid | Residuals interactive method.
2. Grid.Interpolation in automation.
3. The Grid Node Editor.
4. Using the mouse.


1. Grid Residuals
Use the Grid | Residuals command to calculate the Z value.

  1. Open the Surfer worksheet and enter in the X and Y coordinates. Add a third column of 0’s.
  2. Go to File | Save and save the worksheet as a Golden Software Data (*.dat) file and close the worksheet.
  3. Choose the Grid | Residuals command, specify the GRD file and click Open.
  4. Specify the data file and click Open.
  5. In the Grid Residuals dialog box, select the columns containing the X and Y data, and choose the column of 0's for the Z value.
  6. Choose a column to contain the residuals values (i.e. column D) and click OK.
  7. The worksheet will open and the residuals will be displayed in the specified column. The residuals returns the negative of the Z value in the grid.
  8. Use the worksheet Data | Transform command with the equation D = -D to reverse the sign of the residuals in column D to get the actual grid values

2. GridInterpolate
To automate the process, use the GridInterpolate.bas script available for free download on goldensoftware.com.

3. Grid Node Editor
Go to Grid | Grid Node Editor, select the grid file and click Open. The grid will be displayed in the Grid Node Editor. Select any node and the X, Y and Z coordinate values for that point will be displayed at the top of the window. You can click on a different grid node to select another node, or use the arrow keys on the keyboard to move the selection.

4. Using the mouse. Surfer versions 9 and higher display the XY and Z coordinates of the cursor location in the status bar. Move your mouse over the map and view the coordinates of that location in the status bar.

See Also:
You may also want to refer to a related Golden Software Newsletter Article, "Calculate the Z Value At Any XY Point in a Surfer Grid File".
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