[Proj] request help with proj

[Noel Zinn (cc)]

Foot/meter problem maybe?  72030/21966.03 ~= 3.279 ~= number of feet in a meter

Noel Zinn, Principal, Hydrometronics LLC
+1-832-539-1472 (office), +1-281-221-0051 (cell)
noel.zinn at hydrometronics.com (email)
http://www.hydrometronics.com (website)


From: Rick Graves 
Sent: Thursday, August 02, 2012 8:44 AM
To: PROJ.4 Projections Discussions 
Subject: [Proj] request help with proj

Hey,


My northing numbers are way off, so I must be doing something wrong.


I want to convert lat/long to the following coordinate system:


PROJCS["NAD_1983_StatePlane_New_Hampshire_FIPS_2800_Feet",
GEOGCS["GCS_North_American_1983",
DATUM["D_North_American_1983",
SPHEROID["GRS_1980", 6378137.0, 298.257222101]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Transverse_Mercator"],
PARAMETER["False_Easting",984250.0],
PARAMETER["False_Northing",0.0],
PARAMETER["Central_Meridian",-71.66666666666667],
PARAMETER["Scale_Factor",0.9999666666666667],
PARAMETER["Latitude_Of_Origin",42.5],
UNIT["Foot_US",0.3048006096012192]]


I am initializing proj as follows:


proj +proj=tmerc +lat_0=42.5 +lon_0=-71.66666666666667 +k=0.9999666666666667 +x_0=984250.0 +y_0=0 +Units=Foot_US


I have a spot in SE New Hampshire, along the southern border with Massachusetts, close to the SE corner:


-71.32228851666666 42.69722980277778


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).