I received CAD data from PDs and the data they gave is already geocoded (which is great) and it reads well when I add it to my map on ARC map. However, the format is as follows (x = 632086.7, y = 1043211.35) I need them in the following format (x = 33.867022, y = -112.1409750) so that I can use it in R. My first question is what is the original coordinate system format? I've tried identifying it but I haven't found something that is helpful. Second question is, how can I transform the first coordinates into the second format?
I'm assuming you have points.
It sounds like you have already identified the native coordinate system of the CAD data as NAD 1983 HARN State Plane Arizona Central (international feet).
However, you want to get the latitude-longitude values for features instead.
I think you'll have to convert the CAD data into a feature class or shapefile. Once you do, you can use the Project Tool to create a copy in NAD 1983 HARN (geographic coordinate system) then use the Add XY Coordinates tool to populate two fields in the attribute table with the latitude-longitude values.
Note: latitude = y, longitude = x in ArcGIS
Another method is to leave the feature class in State Plane.
- Add the feature class to ArcMap.
- Change the data frame's coordinate system to NAD 1983 HARN (open data frame properties, coordinate system tab, select geographic coordinate systems, north america, NAD 1983 HARN).
- Open the attribute table.
- Add two new fields set to type double.
- Right-click a new field and select Calculate Geometry.
- Select X Coordinate or Y Coordinate.
- Select use coordinate system of the data frame.