This section contains issues that a normal user can notice, that is,
external behavior of the WCS module, not code related.
1)Why data stores were renamed to FeatureDataSets?
2)Mixing data and configuration does not seem to be the best
situation... it would be nicer to allow people to refer data where they
are, and mimic the featureType folder instead. The coverageDataSet
configuration allows for data outside of the coverages dir, but then
creating the actual coverage does not work.
3)Creating a new CoverageDataSet lists descriptions, yet I guess people
would understand “Image + world file” better than “A raster file
accompanied by a spatial data file”, it would be nice to have both the
plugin id and description.
4)Adding a single file is as inconvenient as adding a shapefile
(requires two steps). Both should be one shot every time the bbox and
CRS can be determined out of the box. This is something that we may
should be doing with the new UI I guess.
5)WMS layers for coverages are non queryable. Well, in fact it would be
nice to be able an pick the value (or values) at that location. Worthy
improvement imho.
6)Gtopo30, describe feature curiosity: why is 0 reported as the null
value? The native null is -9999. The data store convert the value on the
fly to 0, but this should be just for the rendered coverage?
7)The GetCoverage demo request is invalid according to the schema,
misses the axis information (<gml:axisName>Lon</gml:axisName>
<gml:axisName>Lat</gml:axisName>)
8)GetCoverage ArcGrid -> ArcGrid does not work?
Caused by: java.io.IOException: The provided metadata are
illegal!CellSizeX!=CellSizeY.
at
org.geotools.gce.imageio.asciigrid.AsciiGridsImageWriter.checkMetadata(AsciiGridsImageWriter.java:239)
at
org.geotools.gce.imageio.asciigrid.AsciiGridsImageWriter.write(AsciiGridsImageWriter.java:144)
at
org.geotools.gce.arcgrid.ArcGridWriter.writeGridCoverage(ArcGridWriter.java:361)
... 32 more
but the error message you get is: “Problems Rendering ImageIOError
writing”... does not help much the user to understand what went wrong.
Knowing that you cannot create an arcgrid file with different
resolutions would help more (the demo request has different x and y
resolutions indeed, the envelope requested is more or less 32° in both
width and height, but rows and cols are 120 and 85).
9)When returning a coverage in GIF or PNG format, what do you do? Render
it as a WMS using the default style?
10)It seems with GET request you can describe the grid either with
resolution or grid envelope, with POST the xml limits you to the grid
envelope? Anyways, it would be nice to have some GET style requests too.
11)This slightly modified GetCoverage request:
<!-- Performs a get coverage. Feel free to play with the elements,
-->
<!-- to get different results.
-->
<GetCoverage service="WCS" version="1.0.0"
xmlns="http://www.opengis.net/wcs"
xmlns:nurc="http://www.nurc.nato.int"
xmlns:ogc="http://www.opengis.net/ogc"
xmlns:gml="http://www.opengis.net/gml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/wcs
http://schemas.opengis.net/wcs/1.0.0/getCoverage.xsd">
<sourceCoverage>nurc:Arc_Sample</sourceCoverage>
<domainSubset>
<spatialSubset>
<gml:Envelope srsName="EPSG:4326">
<gml:pos>9.420000076293944 42.20000076293945</gml:pos>
<gml:pos>11.819999694824217 43.20000049273173</gml:pos>
</gml:Envelope>
<gml:Grid dimension="2" srsName="EPSG:4326">
<gml:limits>
<gml:GridEnvelope>
<gml:low>0 0</gml:low>
<gml:high>120 120</gml:high>
</gml:GridEnvelope>
</gml:limits>
</gml:Grid>
</spatialSubset>
</domainSubset>
<rangeSubset>
<axisSubset name="Band">
<singleValue>1</singleValue>
</axisSubset>
</rangeSubset>
<output>
<crs>EPSG:4326</crs>
<responseCrs>EPSG:32626</responseCrs>
<format>TIFF</format>
</output>
</GetCoverage>
provides quite a cryptic error message:
“java.lang.IllegalArgumentException: The operation name parameter may
not be null.”,
which is really related to a coding error afaik:
[AVVERTENZA] org.vfny.geoserver.wcs.WcsException - encountered error:
java.lang.IllegalArgumentException: The operation name parameter may notbe null.
org.vfny.geoserver.wcs.WcsException: java.lang.IllegalArgumentException:
The operation name parameter may not be null.
at
org.vfny.geoserver.wcs.responses.CoverageResponse.execute(CoverageResponse.java:247)
at
org.vfny.geoserver.wcs.responses.CoverageResponse.execute(CoverageResponse.java:191)
at
org.vfny.geoserver.servlets.AbstractService.doService(AbstractService.java:535)
at
org.vfny.geoserver.servlets.AbstractService.doPost(AbstractService.java:461)
at org.geoserver.request.Dispatcher.post(Dispatcher.java:301)
at org.geoserver.request.Dispatcher.dispatch(Dispatcher.java:185)
at
org.geoserver.request.Dispatcher.handleRequestInternal(Dispatcher.java:58)
at
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:139)
at
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:684)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:625)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:392)
at
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:357)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:445)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1050)
at
org.vfny.geoserver.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:122)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1041)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:354)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:226)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:627)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:141)
at org.mortbay.jetty.Server.handle(Server.java:269)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:430)
at
org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:701)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:617)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:199)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:339)
at
org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:208)
at
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475)
Caused by: java.lang.IllegalArgumentException: The operation name
parameter may not be null.
at javax.media.jai.JAI.createNS(JAI.java:1058)
at
org.geotools.coverage.processing.operation.Resampler2D.reproject(Resampler2D.java:526)
at
org.geotools.coverage.processing.operation.Resample.doOperation(Resample.java:201)
at org.vfny.geoserver.util.WCSUtils.scale(WCSUtils.java:205)
at
org.vfny.geoserver.wcs.responses.CoverageResponse.getFinalCoverage(CoverageResponse.java:430)
at
org.vfny.geoserver.wcs.responses.CoverageResponse.execute(CoverageResponse.java:235)
... 30 more
Ah hem, I just tried to make the x/y resolution more or less equal?
Cheers
Andrea
and