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How can I convert the XYs in my Surfer grid from feet to meters?

The XY coordinates of your grid can be converted from from feet to meters using Grids | Calculate | Transform. Please note that if your grid file already has an associated coordinate system, reprojecting the grid file to a new coordinate system would be the preferred workflow.  See How Can I Convert The Coordinate System Of A Grid File (E.G. From Lat/Long Into Feet Or Meters) Using Surfer?

 

To convert the units of a grid file without an assigned coordinate system, the first step is to translate the origin of the grid from feet to meters.

  1. Click Grids | Calculate | Transform.
  2. In the Grid Transform dialog select your grid file by clicking the Browse button. Before you click Open, in the Grid Info area, note the xMin and yMin values.These are the coordinates of the origin in the original units, feet in this case.
  3. Using a calculator or worksheet, divide these values by 3.28084. These are the new coordinates of the origin in meters.
  4. Find the difference between the coordinates of the origin in meters and the original coordinates in feet. This is the "offset".
  5. Click Open.
  6. In the Grid Transform dialog, select Offset for the Operation.
  7. Enter the offset calculated above for the X Offset and Y Offset.
  8. Click OK.

The second step is to scale the rest of the coordinates in the grid file from feet to meters.

  1. Click Grids | Calculate | Transform.
  2. In the Grid Transform dialog select your grid file by clicking the Browse button.
  3. For the Operation, choose Scale. The Scale option multiples the X and Y ranges by a factor.
  4. For the X Scale and Y Scale, enter 0.3048 (which is how many meters are in a foot).
  5. Change the Output Grid File, if you desire.
  6. Click OK and the transformed grid is created. This is the grid file in meters.

 

Updated October 30, 2017 

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