On Fri, Oct 2, 2015 at 9:40 PM, Cathy Hu <CHU@anonymised.com> wrote:
Hi All:
I’m using GeoServer 2.8.0. I have an ImageMosaic Layer (which configured
to read granules information from DB). The granules are browse images and
they are stored in the file system. One problem I have now is that when I
display/overlay the granules (the browse images, filtered using cql filter)
on our base map using OpenLayers 3, there’s huge white space (see pictures
below). I think it’s not the browse image data problem because if I only
have that set of browse images (belong to one dataset) to the layer, the
display is OK, and if I continually add other datasets to the layer, and at
some point, the display has the white space problem. Any idea? Is it
related to the “mosaic” operation or the limitations about the ImageMosaic
layer:
1. All the granules must share the same Coordinate Reference System,
no reprojection is performed. This will always be a constraint.
2. All the granules must share the same ColorModel and SampleModel.
This is a limitation/assumption of the underlying JAI Mosaic operator: it
basically means that the granules must share the same pixel layout and
photometric interpretation. It would be quite difficult to overcome this
limitation, but to some extent it could be done. Notice that, in case of
colormapped granules, if the various granules share the same colormap the
code will do its best to retain it and try not to expand them in memory.
This can also be controlled via a parameter in the configuration file (se
next sections)
3. All the granules must share the same spatial resolution and set
of overviews (if this is not true, overviews will not be used).
I’m sure our browse images are OK for No.1 and for No. 3, we set the
“Heterogenous=true”, but not really understand No2, and not sure about if
our data meet that, how do I know?
It basically means you cannot have a mix of gray and color images. This
limitation has been removed in GeoServer 2.8.0,
but only if you pass this system variable to the JVM that's running
GeoServer:
-Dorg.geotools.coverage.jaiext.enabled=true
Cheers
Andrea
--
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Ing. Andrea Aime
@geowolf
Technical Lead
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