Surveyors Online Toolbox will help you accomplish your online tasks with handy tools. In this group for conversion tools, sharing files and applications for the field.
Conversion between Latitude/Longitude and
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awesome... a few of these no longer exist but there are a few that are quite awesome..
State Plane Coordinates
The State Plane Coordinate system provides coordinateson a flat grid for easy computation while maintaining
a difference between geodetic and grid distance of
one part in 10,000 or better.
The State Plane Coordinate system divides the U.S. into
a hundred or more distinct grid surfaces (Zones).
Do not mix coordinates from one Zone with that in another.
In you need to cross Zone boundaries, use Geodetic Positions.
The utilities in this package provide methods for converting
between Geodetic Positions and State Plane Coordinates
or for finding an SPC Zone.
For more information about the State Plane Coordinate System contact:
The National Geodetic Survey Information Services Branch
phone: (301) 713-3242; Fax:(301) 713-4172 [Mon.-Fri., 7:00 a.m. - 4:30 p.m. EST]
emailĀ
See the text version of anĀ articleĀ about computing State Plane Coordinates that appeared in theĀ Professional SurveyorĀ magazine, January 2004 Volume 24, Number 1
Found Here and another great tool here and here Gary