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Tue Dec 20 00:28:44 EST 2011

745473.8751627404, 72029.90624999696, 1242053.0000937672, 1023283.999999998

(The coordinate system info above is from the prj file.)

So for a spot near the southern border, I am expecting a northing close to 72030 (72,030), but I am getting 21966.03 (21,966).

My easting numbers are closer but not right on.

(I am using proj rel. 4.7.1, 23 September 2009, which came with ubuntu 12.04.)

If someone can see what I am doing wrong, I would appreciate some guidance.

Thanks,

Rick Graves

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<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div><div><font face="arial, helvetica, sans-serif">Hey,</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">My northing numbers are way off, so I must be doing something wrong.</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">I want to convert lat/long to the following coordinate system:</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">PROJCS["NAD_1983_StatePlane_New_Hampshire_FIPS_2800_Feet",</font></div><div><font face="arial, helvetica, sans-serif">GEOGCS["GCS_North_American_1983",</font></div><div><font face="arial, helvetica, sans-serif">DATUM["D_North_American_1983",</font></div><div><font face="arial, helvetica,
 sans-serif">SPHEROID["GRS_1980", 6378137.0, 298.257222101]],</font></div><div><font face="arial, helvetica, sans-serif">PRIMEM["Greenwich",0.0],</font></div><div><font face="arial, helvetica, sans-serif">UNIT["Degree",0.0174532925199433]],</font></div><div><font face="arial, helvetica, sans-serif">PROJECTION["Transverse_Mercator"],</font></div><div><font face="arial, helvetica, sans-serif">PARAMETER["False_Easting",984250.0],</font></div><div><font face="arial, helvetica, sans-serif">PARAMETER["False_Northing",0.0],</font></div><div><font face="arial, helvetica, sans-serif">PARAMETER["Central_Meridian",-71.66666666666667],</font></div><div><font face="arial, helvetica, sans-serif">PARAMETER["Scale_Factor",0.9999666666666667],</font></div><div><font face="arial, helvetica, sans-serif">PARAMETER["Latitude_Of_Origin",42.5],</font></div><div><font face="arial, helvetica, sans-serif">UNIT["Foot_US",0.3048006096012192]]</font></div><div><font face="arial,
 helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">I am initializing proj as follows:</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">proj +proj=tmerc +lat_0=42.5 +lon_0=-71.66666666666667 +k=0.9999666666666667 +x_0=984250.0 +y_0=0 +Units=Foot_US</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">I have a spot in SE New Hampshire, along the southern border with Massachusetts, close to the SE corner:</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">-71.32228851666666 42.69722980277778</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">If you give 42.69722980277778, -71.32228851666666 to http://maps.google.com/, it will show you a
 spot in New Hampshire (but gives a closest address in Massachusetts just across the border, no big deal).</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">From a shape file that I got from New Hampshire, the bounding box is as follows:</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">745473.8751627404, 72029.90624999696, 1242053.0000937672, 1023283.999999998</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">(The coordinate system info above is from the prj file.)</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">So for a spot near the southern border, I am expecting a northing close to 72030 (72,030), but I am getting 21966.03 (21,966).</font></div><div><font
 face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">My easting numbers are closer but not right on.</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">(I am using proj rel. 4.7.1, 23 September 2009, which came with ubuntu 12.04.)</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">If someone can see what I am doing wrong, I would appreciate some guidance.</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">Thanks,</font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">Rick Graves</font></div><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; "><br></div></div></div></body></html>
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