[MAPSERVER-USERS] Tiff files with different projections in the samelayer

[Ed McNierney]

Pål -

The problem is that your TILEINDEX shapefile is only in one projection, and there is no facility for recording per-file projection parameters in it.

I would instead recommend that you create one layer, and one TILEINDEX, for each distinct projection, and then create a GROUP that combines all these layers into a single logical layer you can turn on or off and treat as if it were a single layer.

     - Ed

P.S. I wonder if it *might* be possible to bundle these in one layer if you reprojected each image into a common projection, created a TILEINDEX for those files, then replaced those reprojected files with the originals.  The TILEINDEX is used to quickly identify candidate images for use in rendering the map request, and GDAL *might* respect the projection in the GeoTIFF once the file was opened.  But I've never tried that and I think the GROUP approach I described is much simpler and safer.

Ed McNierney
Chief Mapmaker
Demand Media / TopoZone.com
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
Phone: 978-251-4242, Fax: 978-251-1396
ed at topozone.com

-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Pål Kristensen
Sent: Friday, March 14, 2008 11:21 AM
To: mapserver-users at lists.osgeo.org
Subject: [MAPSERVER-USERS] Tiff files with different projections in the samelayer


Hi!

I have several GeoTiff files with different projections parameters, they are
all transverse mercator but the central meridian and the latitude of origin
differs. The projection information is written in the tiff files, hence the
files are real GeoTiffs. Is it possible to build a tileindex for these files
without re projecting them to a common projection, and access them trough
one single layer in a mapfile?

Regards
Pål Kristensen
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