Hey guys,
Can anyone provide any info on what is happening here.
Thanks
Michael
On Wed, Sep 7, 2016 at 1:16 PM, Michael Pascoe <
[email protected]> wrote:
> Hello,
>
> I have an oracle georaster being accessed via the Image Mosaic JDBC plugin
> (version information below). The georaster is stored in EPSG:4326. I have
> an openlayers client with a tiled wms layer that displays the data in
> EPSG:900913.
>
> The issue I am having is that the tiles requested by openlayers appear to
> have a slight overlap at the edges.
>
> As an example the following two requests are for adjacent tiles (one just
> north of the other). In the northern tile there is a green area that stops
> just short of the bottom of the tile while in the southern tile the green
> area extends into the top of the tile slightly.
>
> Northern tile
>
> /geoserver/wms?LAYERS=nafi%3AFire%20Scars%20by%20Month%
> 20Current&TRANSPARENT=TRUE&SERVICE=WMS&VERSION=1.1.1&
> REQUEST=GetMap&STYLES=&FORMAT=image%2Fpng&SRS=EPSG%3A900913&
> BBOX=14793316.704141,-1291480.0297266,14798208.67395,-
> 1286588.059917&WIDTH=512&HEIGHT=512
>
> (Attached as northern_tile.png)
>
> Southern tile
>
> /geoserver/wms?LAYERS=nafi%3AFire%20Scars%20by%20Month%
> 20Current&TRANSPARENT=TRUE&SERVICE=WMS&VERSION=1.1.1&
> REQUEST=GetMap&STYLES=&FORMAT=image%2Fpng&SRS=EPSG%3A900913&
> BBOX=14793316.704141,-1296371.9995361,14798208.67395,-
> 1291480.0297266&WIDTH=512&HEIGHT=512
>
> (Attached as southern_tile.png)
>
> So when viewed in openlayers it appears like:
>
> (Attached as open_layers.png)
>
> Note the green sliver at the bottom of the top green area.
>
> This artifiact is not coming from the data itself, as can be seen by
> requesting the two areas together.
>
> /geoserver/wms?LAYERS=nafi%3AFire%20Scars%20by%20Month%
> 20Current&TRANSPARENT=TRUE&SERVICE=WMS&VERSION=1.1.1&
> REQUEST=GetMap&STYLES=&FORMAT=image%2Fpng&SRS=EPSG%3A900913&
> BBOX=14793316.704141,-1296371.9995361,14798208.67395,-
> 1286588.059917&WIDTH=512&HEIGHT=1024
>
> (Attached as combined.png)
>
> Note that there is no gap/sliver in the bottom of the top green area.
>
> You can see that the BBOXes share a common edge. The bottom of the
> northern tile (-1291480.0297266) is the same as the top of the southern
> tile (-1291480.0297266).
>
> What could be causing this slight overlap?
>
> I have also noticed that when zooming in and out there seems to be slight
> shifts in the position of the raster layer. This does not occur for any of
> the vector layers.
>
> The layer is being styled using the following SLD:
>
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <StyledLayerDescriptor version="1.0.0"
> xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd"
> xmlns="http://www.opengis.net/sld";
> xmlns:ogc="http://www.opengis.net/ogc";
> xmlns:xlink="http://www.w3.org/1999/xlink";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
> <NamedLayer>
> <Name>raster_trans_50</Name>
> <UserStyle>
> <Title>A raster transparency with close to 50% transparency</Title>
> <FeatureTypeStyle>
> <Rule>
> <Name>rule1</Name>
> <RasterSymbolizer>
> <Opacity>0.51</Opacity>
> </RasterSymbolizer>
> </Rule>
> </FeatureTypeStyle>
> </UserStyle>
> </NamedLayer>
>
> Tile caching is disabled for this layer.
> The georaster has an 8 bit cell depth and uses a pallette.
>
> Version information:
>
> Oracle: 11.2.0.1.0 (on Windows Server 2008 R2 Enterprise - 64 bit)
> Geoserver: 2.9.0 (on RHEL 6.8 - 64 bit)
> Running on: Apache Tomcat/7.0.70
> JVM Version: Oracle Corporation: 1.8.0_91 (Java HotSpot(TM) 64-Bit Server
> VM)
> Native JAI: Not installed
> Native JAI ImageIO: Not installed
>
> This is not our production setup, I have listed the above versions as this
> is what was used when producing the above examples. The problem originally
> occurred on an older version of Geoserver running in tomcat 7 on windows.
>
> Thank you for your time.
>
> Michael Pascoe
>
--
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Relational Data Systems
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PO Box 3680, Darwin, NT, 0801
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