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| How can I convert my GeoTIFF from Northing/Eastings to Lat/Long? |
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To change the projection of the coordinates of an imported TIF file, you can use the projection conversion tool in the Surfer 9 worksheet:
- Go to Map | New | Base Map, select your GeoTIF or SID image and click Open. It will open in Surfer in the Northing/Easting coordinates.
- In the Object Manager, double click on “Base” to open the Map: Base Properties dialog.
- The X and Y min and max values are shown in the Image Coordinates section. Copy and paste this data into the Surfer worksheet. Be sure you have the data for Xmin, Ymin in row 1 and Xmax, Ymax in row 2. Note that you do not have to close the Map: Base Properties dialog. Just copy the data from the dialog, click in the Surfer window to access the worksheet window and paste the data into the desired worksheet cell. Go back to the plot window, copy the next coordinate and repeat.
- Go to Data | New Projected Coordinates.
- In the New Projected Coordinates dialog, click the (…) button next to Source Coordinate System.
- In the Assign Projection dialog, specify the projection or coordinate system for the Northing/Easting coordinates and click OK.
- Click the (…) button next to the Target Coordinate System.
- In the Assign Projection dialog, open the Geographic (lat/lon) section and select the datum for the lat/long coordinates. In many cases, this is World Geodetic System 1984. Click OK.
- Make sure the Source Columns and Target Columns are correct and click OK. The converted lat/long data will be populated in the Target Columns.
- Go back to the plot window.
- In the Map: Base Properties dialog, in the Image Coordinates section, type in these new X and Y min and max values in lat/long and click OK. Now the image is referenced in lat/long coordinates.
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