[ka-Map-users] MapServer Reprojection

[Delfos, Jacob]

Hi Ryan,

The layer projection should be what the layer dataset is in. In the end,
everything gets reprojected to what projection the mapfile is in. But if
your data is in a projection other than the mapfile projection, then
MapServer needs to know where to project it FROM.

Hope that helps.

Jacob

 

> -----Original Message-----
> From: Ryan Ollerenshaw [mailto:ollerery at engr.orst.edu] 
> Sent: 17 July 2006 23:13
> To: Delfos, Jacob
> Cc: ka-map-users at lists.maptools.org
> Subject: RE: [ka-Map-users] MapServer Reprojection
> 
> So is the projection that i define in the mapfile and layer 
> the projection that
> the data is in or what it is getting reprojected to?  I was 
> never sure if the
> projection that data is in should be the mapfile projection 
> or the layer
> projection or the wms_projection.
> 
> Quoting "Delfos, Jacob" <Jacob.Delfos at maunsell.com>:
> 
> > Ryan,
> >
> > I don't think MapServer will reproject unless the layer and 
> the mapfile
> > have a projection defined, like:
> >
> > #####################
> > PROJECTION
> > "init=epsg:4326"
> > END
> > #####################
> >
> > You would have to put that in your layer, and your mapfile 
> (the global
> > projection). This is separate to projection parameters 
> specified in the
> > metadata, for WMS, WCS, or other web-services. Those 
> parameters are used
> > by the remote system to find out what projection the layer you are
> > serving out is in.
> >
> 
> 
> 
> >
> > > -----Original Message-----
> > > My problem is that no matter what I have my SRS numbers set
> > > to my data will
> > > always be displayed the same.  What could I be missing that
> > > would cause
> > > MapServer's re-projection capabilities not to work.
> > >
> > > I have several tiled .tiff images that I georeference by
> > > lat/long values using:
> > > gdal_translate -a_ullr 180 0 210 -30  thm_dir_N-30_180.png
> > > thm_dir_N-30_180.tiff
> > >
> > > I am then displaying them in MapServer using:
> > >
> > > LAYER
> > >   NAME "themis"
> > >   STATUS ON
> > >   TILEINDEX "thm_dir.shp"
> > >   TILEITEM "location"
> > >   TYPE RASTER
> > >   DUMP TRUE
> > >   METADATA
> > >     wcs_name "THEMIS_Data"
> > >     wcs_description "THEMIS dataset"
> > >     wcs_label "THEMIS dataset"
> > >     ows_srs "EPSG:4326"
> > >     ows_extent "0 -90 360 90"
> > >     wcs_resolution "150 150"
> > >     wcs_size "2700 3197"
> > >     wcs_formats "GEOTIFF"
> > >   END
> > > END
> > >
> > > Here is what gdalinfo reports, but isn't it MapServer that
> > > does all the
> > > re-projection?  So that fact that the Coordinate System here
> > > is blank is ok
> > > right?
> > >
> > > gdalinfo thm_dir_-30_000.tiff
> > > Driver: GTiff/GeoTIFF
> > > Size is 7680, 7680
> > > Coordinate System is `'
> > > Origin = (0.000000,0.000000)
> > > Pixel Size = (0.00390625,-0.00390625)
> > > Corner Coordinates:
> > > Upper Left  (   0.0000000,   0.0000000)
> > > Lower Left  (   0.0000000, -30.0000000)
> > > Upper Right (  30.0000000,   0.0000000)
> > > Lower Right (  30.0000000, -30.0000000)
> > > Center      (  15.0000000, -15.0000000)
> > > Band 1 Block=7680x1 Type=Byte, ColorInterp=Gray
> > >   Overviews: 3840x3840, 1920x1920, 960x960, 480x480, 240x240
> > > _______________________________________________
> > > ka-Map-users mailing list
> > > ka-Map-users at lists.maptools.org
> > > http://lists.maptools.org/mailman/listinfo/ka-map-users
> > >
> >
> 
> 
>