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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

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Examples of the numbers and where the are roughly located (if you know that) would be helpful. –  Chad Cooper Apr 10 '12 at 1:32
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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 '12 at 3:10
    
I have added some examples (they are in a spreadsheet) –  Chris Muench Apr 10 '12 at 12:55
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2 Answers

up vote 1 down vote accepted

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.

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

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that assumes that QGIS can work out the projection. –  iant Apr 10 '12 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 '12 at 9:33
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