[Tilecache] Huge dateline gap

[Roger André]

Hi Christopher,

Thanks for the advice, I'll give that (0,10) a shot.

Any chance you can send me the link to, or the full-text of the conversation
between Frank and Klokan?

Roger
--

On Tue, Nov 18, 2008 at 4:17 PM, Christopher Schmidt <
crschmidt at metacarta.com> wrote:

> On Tue, Nov 18, 2008 at 04:07:19PM -0800, Roger André wrote:
> > It's been pointed out that I didn't include a great deal of information
> > about my setup.  I doubt it will matter much, but here goes:
> >
> > I am using TileCache to read a large (14400x7200) raster with global
> > extents.  The raster projection is in lat/lon WGS84.  TileCache is set to
> > read this data via a MapServerLayer layer type, with settings that match
> the
> > example in the out-of-the-box tilecache.cfg (metaTile=true, metaSize=5,5,
> > metaBuffer=10).
>
> set metaBuffer:0,10 and you may see your edge defects disappear to some
> extent.
>
> Probably something like this is the problem:
>
> 11:55 < FrankW> The problem is that GDAL transforms the destination area
> back to the source coordinate system by sampling a grid of points over
> the region.
> 11:55 < FrankW> But points right on the international date line might
> transform two different ways.
> 11:55 < FrankW> so the region selector is missing the last swath of
> data.
>
>
> In GDAL-land, you can use:
>
> 11:42 < FrankW> klokan:  Try adding "-wo SOURCE_EXTRA=120" to your
> gdalwarp commandline without the quotes
>
>
> But I don't know how to use that through MapServer.
>
> > I am using the following package versions in my stack, and they have all
> > been built from source:
> >
> > gdal-1.5.2
> > mapserver-5.2.0
> > proj-4.6.1
> > proj-datumgrid-1.4
> > tilecache-2.04
> > --
> >
> >
> >
> > On Tue, Nov 18, 2008 at 3:17 PM, Roger André <randre at gmail.com> wrote:
> >
> > > Ok, so now that I've gotten meta-tiling with edge buffering to work, I
> seem
> > > to be able to better control the missing pixel rows that were causing
> > > horizontal stripes in my Google Map tiles.  Only now I have a huge gap
> at
> > > the international date line.  I also have a band of missing data at the
> > > extreme South edge of my tiles when I am past Zoom Level 5.  I can
> probably
> > > live with that, but since my data set is global, I find it interesting
> that
> > > it's getting cut off, and only on the South side.
> > >
> > > Anyone seen this before?
> > > --
> > >
>
> > _______________________________________________
> > Tilecache mailing list
> > Tilecache at openlayers.org
> > http://openlayers.org/mailman/listinfo/tilecache
>
>
> --
> Christopher Schmidt
> MetaCarta
>
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