convert the coordinate system of raw data in the Surfer worksheet.
convert the coordinates of raw data, follow these steps:
to File | Open, select the XYZ data file you have and click Open.
the data file opens in the Surfer worksheet, go to Data | New Projected
the New Projected Coordinates dialog, assign the appropriate Source
Column X and Source Column Y columns (which are your
current X and Y columns).
the (…) button to the right of Source Coordinate System to enter
the source coordinate system for the data.
button next to Source Coordinate System.
the Assign Projection dialog, select the current projection. For
example, to select UTM, you could open the Projected Systems | UTM | North
the appropriate zone for your data (ie. North America NAD27 UTM zone 04N)
and click OK.
In the Assign Projection dialog,
select the source coordinate system for the data,
which in this case is UTM
1927 Zone 4N, and click OK.
you click OK in the Assign Projection dialog, the selected
coordinate system is entered as the Source Coordinate System.
the X and Y Target Columns where you want the re-projected data (ie.
latitude and longitude) to be entered. By default, the first two empty data
columns are entered.
the (…) button to the right of Target Coordinate System to enter
the target coordinate system. For example, let’s say we want to convert the UTM
to latitude and longitude.
the Assign Projection dialog, open the Geographic (lat/long)
this category many different datums are listed. You can choose which datum you
want your lat/long coordinates use. Most simple lat/long coordinates use World
Geodetic System 1984 (WGS84) as the datum. Select the datum you wish and
click OK. This coordinate system is entered as the Target Coordinate
In the New Projected Coordinates dialog, specify the Source and
and the Source and Target Coordinate Systems.
OK and the coordinates in the designated source columns are converted
and entered into the designated target columns. Use the File | Save or File
| Save As commands to save the data.
The original UTM X and Y data in columns A and B are converted
to longitude and
latitude data in Columns D and E.