Raster Issues in MapServer 4.4.1

[Chris Helm]

Frank,

I've created a site where you can see the problem
occurring with the Alaskan image showing up distorted
in Sweden. The mapfile is very simple, it has two
layers, the raster, and countries.

http://glims.colorado.edu/~chelm/glacierdata/

thanks,
Chris
--- Frank Warmerdam <fwarmerdam at GMAIL.COM> wrote:
> On 5/17/05, Chris Helm <helmster_99 at yahoo.com>
> wrote:
> > I have a few strange Raster situations I wanted to
> > share with the list.
> >
> > 1. I have a few rasters (Geotiffs) I use as
> > backgrounds for vector data and they're appearing
> on
> > opposite sides of my map, very distorted. When I
> zoom
> > to Alaska images from Sweden can be seen, and when
> I
> > zoom to Sweden the image from Alaska appears. The
> > Sweden images also can seen, distorted, in
> Siberia.
> >
> > Has anyone seen this behaviour previously?
>
> Chris,
>
> Based on a quick inspection this seems to be a
> reprojection
> "wrap around" issue.   Is it possible for you to
> prepare a
> mapfile and one raster image that demonstrate this
> problem
> with shp2img or a direct mapserv invocation?  If so,
> I can
> dig into the problem in more detail.
>
> > 2. When querying my data at a very 'zoomed in'
> extent
> > (and other times) the query map that is being
> > generated displays all rasters as if you were
> zoomed
> > to the full extent of the application. Plus I use
> a
> > tiled global MODIS background image that draws
> only
> > the section that I'm zoomed into to, but at full
> > extent.
>
> This is a bit odd.  I would once again guess at it
> being
> reprojection related, but it does not seem
> consistent with
> the wraparound problem.   Once again an isolated
> reproduable example would be helpful.
>
> 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
>

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