I have a dataset with an unknown and possibly custom projection. However, some of the features have lat/long coordinates in the attribute table. How might I figure out the projection and coordinate system of this data based on this info?
What I've tried:
- Asking the folks who provided me with the data--so far this isn't helpful.
- Assuming a datum and projecting the data in ArcMap to common systems, then checking if it looks right.
- Georeferencing an image of the data based on known coordinates. Looks good, but isn't precise enough.