[OSRS-PROJ] gauss-krueger/transverse mercator
Gerald I. Evenden
gevenden at capecod.net
Mon Jun 12 17:48:24 EDT 2000
A couple of elements caught my eye here and represent modifications
to PROJ.4 that are not part of the USGS distribution. I am curious
as to what the parameter definitions are:
+unfact= ???
+k= ???
"k" is terminology for the scale factor anywhere while k_0 refers to
a scale factor at a specific location. I don't think dropping the _0 wise
or meaningful.
As for "unfact" I have absolutely *no* idea what that is.
Also see imbedded note below.
__________________________________________________
Jerry Evenden and the Low Riders, Katie and Daisy May
gevenden at capecod.net http://www.capecod.net/~gevenden
----- Original Message -----
From: Markus Neteler <neteler at geog.uni-hannover.de>
To: <osrs-proj at remotesensing.org>
Sent: Monday, June 12, 2000 4:40 PM
Subject: Re: [OSRS-PROJ] gauss-krueger/transverse mercator
> Hi Andreas,
>
> maybe not an answer for your question, but of general
> (European) interest: I convert with following calls:
>
> Rechtswert Hochwert -> Lat Long
>
> proj -I +proj=tmerc +a=6377397.1550000003 +es=0.0066743720\
> +lat_0=0.0000000000 +lon_0=$bezug +k=1.0000000000 +x_0=$ans
+unfact=1.0000000000
>
> where $bezug=meridian (degree, example: 9)
> and $ans= False Easting (example: 3500000)
>
> Example:
> In: 3560000 5700000
> Out: 9d51'46.414"E 51d25'57.97"N
>
> -------------------------------
> Reverse transformation:
> Lat Long -> Hochwert Rechtswert (y x)
>
> proj +proj=tmerc +a=6377397.1550000003 +es=0.0066743720
+lat_0=0.0000000000\
> +lon_0=$bezug +k=1.0000000000 +x_0=$ans +unfact=1.0000000000
>
> where $bezug=meridian (degree, example: 9)
> and $ans= False Easting (example: 3500000)
>
> Example:
>
> In: 9d51'46.414"E 51d25'57.97"N
> Out: 3560000.01 5699999.99
>
> Using your example I get (note: reverse order):
> 10.5W 29.27N
> 1585979.82 3402162.10
!!NOTE: you are about 20 degrees west of the CM with the above
longitude. A tad out of range of the projection.
> I am not shure if it is defined in southern hemisphere (but why
> not, at least numerically)?
>
> Best wishes
> Markus
...
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