We have grid north and grid east data that we have received for address information. How can this be converted into latitude and longitude? I am not sure what format this grid_east and grid_north data is in, but it seems to uniquily identify a record. The numbers are integers. (large)

Here are some examples: (They are in Upstate New York)

6 HERON WAY NORTH 14450 GRID EAST: 803160 GRID NORTH: 1122110

16 CROSSWINDS CIR 14450 GRID EAST: 819252 GRID NORTH: 1123388

  • Examples of the numbers and where the are roughly located (if you know that) would be helpful. Apr 10, 2012 at 1:32
  • 4
    There are thousands of different systems out there (see spatialreference.org). Since this is a detective task, you need to look at the evidence to narrow down the search. What region the coordinates are from. Are the measures in metres or feet. etc.
    – Mike T
    Apr 10, 2012 at 3:10
  • I have added some examples (they are in a spreadsheet) Apr 10, 2012 at 12:55

2 Answers 2


Most likely they are a State Plane coordinate system for your local New York area. Check the units (Ft, meters?), Google coordinate systems for your area/state, once you're sure of the system there are many ways to re-project them or convert systems.


Use QGIS and export the data to a new projection, WGS84 would be the choice. 2 minute job.

  • 1
    that assumes that QGIS can work out the projection.
    – Ian Turton
    Apr 10, 2012 at 8:56
  • ouch! I was sorta tryin to encourage chris to try..... Now that he has provided examples, it is a very different question
    – Willy
    Apr 11, 2012 at 9:33

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