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1.Log in to EQuIS Professional and open RT_COORD_TYPE.

2.For the coordinate system you use, open the coordinate system projection file *.prj file usually located in C:\Program Files\ArcGIS\Coordinate Systems directory (or Reference Systems directory), in a text editor such as Notepad. For example, for Springfield's UTM Zone 17N NAD 27, open the NAD 1927 UTM Zone 17N.prj file.


Note: As of ArcGIS 10.1, projection files are no longer installed on the local drive. Follow the steps below to retrieve the appropriate *.PRJ file.

1.Launch ArcMap.

2.Right-click on the Data Frame title in the Table of Contents, and then click Properties.

3.Navigate to the Coordinate System tab.

4.Right-click on the desired Coordinate System in the tree, then click Save As.

5.Save the *.prj file.


3.Copy and paste the full EPSG string/PRJ representation of the coordinate system from the *.prj file into RT_COORD_TYPE.ESRI_SPATIAL_REF.

4.Save the changes.


In order to specify a vertical coordinate system as well as a horizontal coordinate system, append the contents of the vertical coordinate system *.prj file to RT_COORD_TYPE.ESRI_SPATIAL_REF. If the field contains the string VERTCS[, the vertical coordinate system will be set for users of ArcGIS 9.2 or later. For example, for NAVD 88, the following would be appended to the esri_spatial_ref value.





Given a horizontal coordinate system of UTM Zone 17N NAD 27, the entire RT_COORD_TYPE.ESRI_SPATIAL_REF value would be the following.






UNIT["Meter",1.0]] VERTCS["NAVD_1988",VDATUM["North_American_Vertical_Datum_1988"],PARAMETER["Vertical_Shift",0.0],