Hi Arnaud,
honestly I don't know, seems like an arithmetic issue happening somewhere
in the
mosaicking code.
I've recently made a change that _might_ help:
https://osgeo-org.atlassian.net/browse/GEOT-5615
The fix is present in GeoServer 2.10.2 and 2.11.0. If you are not using
them, I'd suggest to upgrade and
see if that helps, if you're already there instead, open a ticket in the
bug tracker with sample data and
requests showing the issue, so that developers can debug it on their own
machine
Cheers
Andrea
On Wed, Apr 12, 2017 at 9:39 AM, Arnaud L. <arnaud.lis...@codata.eu> wrote:
> Hi all,
>
> I have set up an ImageMosaic store with existing TIFF tiles. They are
> not GeoTIFFs, but regular TIFF files with worldfiles.
> The index is stored in PostGIS (the information was already present
> there, I only had to create a view to match the index schema).
>
> In some cases, the stitching of rasters is not perfect and a black line
> appears between tiles.
>
> The rasters are in EPSG:32631, and I am also querying GeoServer's WMS in
> EPSG:32631, so no reprojection is done.
> The rasters are all 1000 pixels in widht and height, the resolution is
> 0.15875 (in EPSG 32631, so 0.15875 m/pix), so each raster is 158.75m in
> width and height.
>
> Here is an example request, and the resulting raster :
> WMS url :
> http://localhost/geoserver/dev/wms?SERVICE=WMS&VERSION=1.
> 3.0&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&
> LAYERS=dev%3Ageorasters_test&CRS=EPSG%3A32631&STYLES&WIDTH=
> 1920&HEIGHT=1349&BBOX=742405.64625%2C5087266.7415625%
> 2C742710.44625%2C5087480.895312501
> Raster : http://i.imgur.com/pE2H4QJ.png
>
> Slightly changing the bbox fixes things up (1 meter to the east) :
> WMS url :
> http://localhost/geoserver/dev/wms?SERVICE=WMS&VERSION=1.
> 3.0&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&
> LAYERS=dev%3Ageorasters_test&CRS=EPSG%3A32631&STYLES&WIDTH=
> 1920&HEIGHT=1349&BBOX=742406.64625%2C5087266.741562501%
> 2C742711.44625%2C5087480.895312501
> Raster : http://i.imgur.com/PjflMLd.png
>
> In my GeoServer layer's configuration, I have tried with "Accurate
> resolution computation" to true and false, to no avail (both examples
> above are with this setting set to true).
>
> Is there any other setting controlling the stitching mechanism ?
> Where could be the problem here ? In the index, or in the data ? Both
> are supposed to be 100% accurate, and indeed the both work without
> problem with another stitching library (no idea what it is exactly, it's
> a custom dll developed by a third party in .NET).
>
> Thanks a lot for your help !
>
> --
> Arnaud
>
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@geowolf
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