Does anyone here know the formula for converting NAD83 coordinates to latitude and longitude in degrees? The Internet doesn't seem to have it.
NAD83 is just a datum, not the projection so NAD83 could be in lat-long or something else. What do the coordinates you have look like?
Quote from: corco on June 07, 2014, 12:56:07 PM
NAD83 is just a datum, not the projection so NAD83 could be in lat-long or something else. What do the coordinates you have look like?
For a certain point within the city of Cincinnati, the X and Y coordinates are 1404800 and 450892.1875. I'm using a list of points within the city of Cincinnati.
Okay, they're state plane then. Two ways to do it:
One by one: http://www.earthpoint.us/stateplane.aspx
1404800 is the X, 450892.1875 is the Y, the zone you want is 3402 Ohio - South and the units in US survey feet.
Batch: http://www.earthpoint.us/batchconvert.aspx
and then follow those instructions
The math to do it yourself in Excel gets to be pretty tricky- conceptually I understand how it works, but to actually devise the formula I'm not even entirely sure how to do it.
This site (http://www.ngs.noaa.gov/PC_PROD/pc_prod.shtml) has downloadable programs that allows one to convert state plane coordinates to lat/long & vice-versa.
Quote from: PHLBOS on June 09, 2014, 01:42:42 PM
This site (http://www.ngs.noaa.gov/PC_PROD/pc_prod.shtml) has downloadable programs that allows one to convert state plane coordinates to lat/long & vice-versa.
I use Corpscon at work for conversions, which is a free download on that site (NGS). It's easy to use and works well.