Request for Question Clarification by
pafalafa-ga
on
01 Aug 2005 07:19 PDT
I have located some resources that I believe will provide you the
information you need to either use and existing program or create a
new program for the conversion you need.
However, given the inherent complexity of the task, I thought I would
post the resources here for your review before providing a final
answer.
Please have a look at these links, and let me know if they do the trick:
An article from 2004 describing the State Plane system, and coversion
tools that are available:
http://web.archive.org/web/20040328045921/http://www.profsurv.com/ps_scripts/article.idc?id=1180
NGS Geodetic Toolkit, Part 7: Computing State Plane Coordinates
Numerous detailed publications on State Plane conversions are available here:
http://www.ngs.noaa.gov/PUBS_LIB/pub_index.html
National Spatial Reference System: Datums, Networks, Coordinate Systems
the above site includes links to:
State Plane Coordinate System of 1983 - NOAA Manual NOS NGS 5
http://www.ngs.noaa.gov/PUBS_LIB/ManualNOSNGS5.pdf
Understanding the State Plane Coordinate Systems
http://www.ngs.noaa.gov/PUBS_LIB/UnderstandingSPC.pdf
The State Coordinate Systems (A Manual for Surveyors) SP 235
http://www.ngs.noaa.gov/PUBS_LIB/publication235.pdf
State Plane Coordinates by Automatic Data Processing SP 62-4
http://www.ngs.noaa.gov/PUBS_LIB/publication62-4.pdf
[NOTE: this is a giant document -- 60+ Mb -- and provides the
equations and constants needed for converting from State Plane to
Lat/Long. Actual state-by-state parameters are included in a table at
the back of the document. If you want to work directly from
conversion formulas, this is the reference you will need]
As far as actual programs, there is both an online conversion program
as well as downloadable source code available:
The "Tools" page here:
http://www.ngs.noaa.gov/TOOLS/spc.shtml
State Plane Coordinates
includes:
Interactive Conversions
SPC -> Latitude/Longitude
http://www.ngs.noaa.gov/cgi-bin/spc_getgp.prl
and
PC Program
SPCS83
http://www.ngs.noaa.gov/PC_PROD/SPCS83/
which leads to the following options:
==========
http://www.ngs.noaa.gov/PC_PROD/SPCS83/
PC Software Download - SPCS83
Converts NAD 83 state plane coordinates to NAD 83 geographic positions
and conversely. Includes defining constants for NAD 83 coordinate
zones. State plane coordinates are entered or computed to 1 mm
accuracy, while the latitudes and longitudes entered or computed
correspond to approximately 0.3 mm accuracy.
An on-line interactive version is also available from the Geodetic Tool Kit.
Download the PC executable
View the User's Guide.
Download a ZIP'ed archive of the SPCS83 executable, FORTRAN source,
and user's guide.
==========
Another program which seems to more directly target Lat/Long conversions is here:
==========
http://www.ngs.noaa.gov/PC_PROD/GPPCGP/
PC Software Download - GPPCGP
Converts NAD 27 State plane coordinates to NAD 27 geographic positions
(latitudes and longitudes) and conversely. Includes defining constants
for all NAD 27 plane coordinate zones.
Download the PC executable
View the program documentation.
Download a ZIP'ed archive of the GPPCGP FORTRAN source code, and
sample files.[24.7 KB].
Download a ZIP'ed archive of the GPPCGP executable, FORTRAN source,
and sample files.[96.3 KB].
==========
I am quite certain that you can either use these tools directly to
make the conversions you need, or alternatively, use them to write a
program to make the conversions.
Please review these links and let me know how well they meet your
needs, and what other sort of information you need to make for a
complete answer to your question.
Thanks...and best of luck.
pafalafa-ga