Convert NAD83 Coordinate system to Lat & Long Coordinates on Point Feature Class

09-15-2011 09:02 AM
Occasional Contributor III

   I am working on a small project that was assigned to me. I currently have a feature class called SUPPORT_STRUCTURES which is a point feature class of all of our power and service poles in our district. Currently - I have the Projected Coordinate System set to NAD-1983_StatePlane_Washington_North_FIPS_4601_Feet. For each pole, I have an X and Y coorindate in the attributes. That was created not by GPS but once I placed all of the poles with the help of our ortho photos. NOW - what I need to do is determine the Latitude and Longitude for each pole. I am working on using this data with a another peice of software and in order to add the data it requires the Lat and Long coordinates in order to place the data at the correct locations.

   How would I do this using ArcMap 10 - ArcEditor?

Thank you
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2 Replies
Occasional Contributor II
These steps should help:

  1. Add two fields (e.g. LONGITUDE, LATITUDE), type double, to your feature class.

  2. Open the table in ArcMap.

  3. Right-click on the field name and select Calculate Geometry...

  4. Choose "X Coordinate of Point" for longitude or "Y Coordinate of Point" for latitude.

  5. Change "Units" to Decimal Degrees.

  6. Hit "OK".

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Occasional Contributor III
Thank you!! Looks like that is what I am looking for.
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