[Proj] request help with Transverse_Mercator in proj SOLVED
gravesricharde at yahoo.com
Mon Aug 13 16:46:33 EST 2012
> I think you have just switched the values of x_0 and y_0, since x_0 should be False_Easting and y_0 should be False_Northing.
How could I make such a mistake!
I appreciate your help.
Also, I will go with +k_0.
From: Mikael Rittri <Mikael.Rittri at carmenta.com>
To: Rick Graves <gravesricharde at yahoo.com>; PROJ.4 and general Projections Discussions <proj at lists.maptools.org>
Sent: Monday, August 13, 2012 10:29 PM
Subject: RE: [Proj] request help with Transverse_Mercator in proj
I think you have just switched
the values of x_0 and y_0, since x_0 should be False_Easting and y_0 should be
With Proj 4.8.0, I get
+proj=tmerc +lat_0=0 +lon_0=-90 +k=0.9996 +y_0=-4480000.0 +x_0=520000.0 -v
+proj=tmerc +lat_0=0 +lon_0=-90 +k=0.9996 +y_0=-4480000.0 +x_0=520000.0
which is at least near
your expected result. (Maybe I made some other mistake.)
I would prefer to give
the +ellps explicitly, but the default seems to be what you need, or nearly so.
(Not much difference
between the WGS84 and the GRS_1980 ellipsoid.)
And I think +k_0 is now
the recommended parameter name instead of +k, but it seems that +k still works.
From:proj-bounces at lists.maptools.org [mailto:proj-bounces at lists.maptools.org] On Behalf Of Rick Graves
Sent: Monday, August 13, 2012 3:42
To: PROJ.4 Projections Discussions
Subject: [Proj] request help with
Transverse_Mercator in proj
to trouble you, but I still have a couple of states for which I need to get
proj.4 working. This time, it is Wisconsin.
starting with the Western most point in the state. If you plug the
following into maps.google.com, you will see it:
downloaded the shapefiles from the state web site. In the shapefile, the
minimum X point is this:
the metadata from the prj file:
initialized proj as follows:
+proj=tmerc +lat_0=0.0 +lon_0=-90.0 +k=0.9996 +x_0=-4480000.0 +y_0=520000.0
give proj this:
am expecting this:
assume I am not initializing proj correctly.
someone could spot my mistake, I would appreciate it.
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