[Proj] Re: Proj Digest, Vol 51, Issue 2

Neil Robinson halfhaggis at gmail.com
Mon Aug 11 04:07:58 EDT 2008

Hi Gerard,

Thanks for your response. I realise that this isn't a support forum, but I'm
not getting any joy anywhere else and you are clearly very knowledgeable on
this topic

On Sat, Aug 9, 2008 at 6:01 PM, <proj-request at lists.maptools.org> wrote:

> Send Proj mailing list submissions to
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> Date: Fri, 8 Aug 2008 16:49:58 -0400
> From: "Gerald I. Evenden" <geraldi.evenden at gmail.com>
> Subject: Re: [Proj] Transverse Mercator south-oriented projection
>        support?
> To: "PROJ.4 and general Projections Discussions"
>        <proj at lists.maptools.org>
> Message-ID: <200808081649.58507.geraldi.evenden at gmail.com>
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> Groan!

Is  this a bit of a recurring nightmare for you? Sorry about that.

> There is no need to modify the library routines as all that is needed is to
> switch around the x-y and signs of the lat-lons.

I tried lodging a bug with qgis [1], but they seemed to think the problem
was with proj4 (although, through my ignorance that was my guess, so I might
have planted the seed of that conclusion).

> I would just use +proj=tmerc and put some added '-' flags to juggle the
> I/O.
> But that's somebody else's job as I only work on the library.  ;-)

I tried this suggestion (I think I did), but negative zero doesn't make any
sense to proj4.
Without adding the '-' flags, this is what I think the parameters need to be
for one of the projections I'm interested in:

+proj=tmerc +ellps=WGS84 +lat_0 +lon_29 +k=1 +towgs84=0,0,0,0,0,0,0 +units=m

Is it defined more fully on spatialreference.org[2]. You'll note that
spatialreference.org doesn't have a proj4 definition.

If the library isn't the right place to look for a solution to this, where

Thanks for your time. I'm sure this is a pain for you. I hope any additional
groaning will not be too severe.

[1] https://trac.osgeo.org/qgis/ticket/1176

Neil Robinson
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