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File Processing

To process a text file of coordinates, converting them from one coordinate reference frame to another, and/or transforming them from one datum to another, follow these steps:

1 Select the Open... command from the File menu. A standard file Open dialog box will appear.

2. Use the controls in the file Open dialog box to select an existing text file containing coordinates. The file Open dialog box allows you to move up and down the directory hierarchy, and to filter the list of files displayed. Select the desired file by either double clicking on its name, or by selecting its name and then clicking on the OK button. The GEOTRANS File Processing window will appear. The upper half of the GEOTRANS File Processing window displays the input datum, the input coordinate reference frame type, and any associated parameters that were specified in the input file header.

3. If the desired output coordinate reference frame type is not already displayed in the lower half of the window, select the desired entry from the pull-down list in the lower half of the window. The lower half of the window will be updated to display the appropriate parameter fields for the selected output coordinate reference frame type.

4. If the desired output datum, and its associated ellipsoid, is not already displayed in the lower half of the window, select the desired datum using the pull-down list associated with the Datum field near the top of the Output Area.

5. If the output coordinate reference frame type has any parameters associated with it (e.g. a Central Meridian), and the default parameter values displayed in the lower half of the window are not the desired values, change the parameter values by selecting the displayed values and typing over them.

6. Click on the OK button. A standard file Save As... dialog box will appear, with the same layout of fields and controls as the file Open dialog box.

7. Use the controls in the file Save As dialog box to specify the desired name and location for the output file. Output files should be saved as text files (.txt or .dat). Once the file name has been entered, click on the OK button. A GEOTRANS File Processing dialog box will appear.

8. Click on the Start button to begin file processing, converting the coordinates in the input file and writing the results to the output file. When file processing is completed, a message will be displayed showing the number of coordinate points processed and the number of warnings and errors that occurred. Click on the OK button to return to the GEOTRANS main window.

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