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Getting real-world coordinates from a paper map with a custom projection

Question asked by nsusmann on Jan 4, 2016
Latest reply on Jan 5, 2016 by MKennedy-esristaff

I have a paper map with survey points. They used a custom graticule and origin, and included a site register which lists each site's location according to this system. This was all done to preserve data integrity. My end goal is to visit these locations in person/view them in Google Earth. I know the original projection of the map with which they recorded locations, and also the coordinates of their origin point.

 

While georeferencing is an option, I am wondering if there is some way to use Excel, etc. to convert these coordinates (i.e. 117 N 140 E) into usable coordinates (WGS decimal degrees for example).

 

I was thinking about making a custom grid, digitizing the points by hand based on the grid locations, and then reprojecting the points. Would this work?

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