[UMN_MAPSERVER-USERS] show utm geotiff

[Skweda O'Bomsawin]

First, if you want to show your data in UTM, you will have to put a UTM
projection in the PROJECTION section of your MAP section (you can put this
section just below your EXTENT).  

Second, you will have to set your EXTENT and your UNITS correctly, according
to the projection you defined (units are meters of UTM).

Third, -180 -90 180 90 are the extents of the whole world which are not
suitable for a UTM projection.  If you want to use the UTM projection, you
will have to resize your extents to a specific UTM zone which is 6 degrees
wide only.  Outside of this zone, your data will be inaccurate and deformed.
So, if you have a very wide region to represent, it's better to choose an
appropriate projection like Lambert Conformal Conic.

Playing with projection require a particular know-how.  I recommend you to
browse the internet to find tutorials or ask a professional...  You will
find a lot of information on the proj site: http://proj.maptools.org/

Cheers!

Skweda O'Bomsawin


-----Message d'origine-----
De : UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] De la
part de joerg p
Envoyé : 12 septembre 2004 10:10
À : MAPSERVER-USERS at LISTS.UMN.EDU
Objet : Re: [UMN_MAPSERVER-USERS] show utm geotiff

I found another posting, and I think the problem is my map extent:
EXTENT -180 -90 180 90
So it's in latlong format.

How do I write this in UTM actuelly?

I also use:
UNITS dd
Is this ok?

Joerg


-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Titus von der Malsburg
Sent: Sonntag, 12. September 2004 14:40
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] show utm geotiff

On Sat, Sep 11, 2004 at 08:14:25PM +0200, joerg p wrote:
> When I test it with the reprojected image and the Projection tag, the
> image is still shown in latlong. Actuelly I can use whatever in the
> Projection definition, but nothing changes...

The projection used to render the map doesn't depend on the projection
of the layers but on the projection you specify for the map.  Therefore
you have to define the projection for the layers and the projection for
the map.  The latter will be used for rendering.

    Titus

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