[mapserver-users] Re: Mapserver WMS seem not to read +towgs84 parameters

[Rahkonen Jukka]

Thanks Frank,

Adding  +towgs84=0,0,0 made it.  Was it something that I should have been known?  Does more fresh epsg file contain towgs84 parameters for epsg:3067 and other comparable projections?

-Jukka-
 

> -----Alkuperäinen viesti-----
> Lähettäjä: Frank Warmerdam [mailto:warmerdam at pobox.com] 
> Lähetetty: 3. maaliskuuta 2009 21:44
> Vastaanottaja: Rahkonen Jukka
> Kopio: mapserver-users at lists.osgeo.org
> Aihe: Re: [mapserver-users] Re: Mapserver WMS seem not to 
> read +towgs84 parameters
> 
> Rahkonen Jukka wrote:
> > I forget to mention that I am using epsg:3067 in my WMS 
> requests while 
> > image data is in epsg:2393 so Mapserver for sure is reprojecting.
> 
> Jukka,
> 
> I believe the problem is that EPSG:3067 expands as:
> 
>    +proj=utm +zone=35 +ellps=GRS80 +units=m +no_defs
> 
> with no +towgs84 value.  From PROJ 4.6.0 on datum shifts are 
> only applied if we know datum information for the source and 
> destination coordinate system.
> 
> If you want ETRS89 treated as equivelent to WGS84 you might 
> want to add a +towgs84=0,0,0 in the EPSG 3067 entry in the 
> epsg file too.
> 
> Best regards,
> -- 
> ---------------------------------------+----------------------
> ----------
> ---------------------------------------+------
> I set the clouds in motion - turn up   | Frank Warmerdam, 
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial 
> Programmer for Rent
> 
>