AbstractFeatureInfoResponse: WmsException may occurs if Bulsa Parameters are
missing when evaluating a coverage providing a point in different CRS (with
respect to the one of the coverage itself).
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Key: GEOS-2040
URL: http://jira.codehaus.org/browse/GEOS-2040
Project: GeoServer
Issue Type: Bug
Components: WMS
Affects Versions: 1.7.0-beta1
Reporter: Daniele Romagnoli
Assignee: Andrea Aime
Fix For: 1.7.0-beta2
When trying to evaluate the coverage by providing a point that is in a
different CRS with respect to the one of the coverage itself, problems may
occurs when the bursa params are missing.
In such a case, WMS may cause a WmsException resulting in no value displayed in
the OpenLayer client.
TRACE:
-----------
org.vfny.geoserver.wms.WmsException
at
org.vfny.geoserver.wms.responses.featureInfo.AbstractFeatureInfoResponse.execute(AbstractFeatureInfoResponse.java:279)
.....
Caused by: org.opengis.coverage.CannotEvaluateException: Can't evaluate a value
for coordinate (28,593, 42,74).
at
org.geotools.coverage.grid.GridCoverage2D.toPoint2D(GridCoverage2D.java:561)
at
org.geotools.coverage.grid.GridCoverage2D.evaluate(GridCoverage2D.java:532)
at
org.vfny.geoserver.wms.responses.featureInfo.AbstractFeatureInfoResponse.execute(AbstractFeatureInfoResponse.java:268)
... 53 more
Caused by: org.opengis.referencing.operation.TransformException: Bursa wolf
parameters required.
at
org.geotools.geometry.TransformedDirectPosition.setSourceCRS(TransformedDirectPosition.java:205)
at
org.geotools.geometry.TransformedDirectPosition.transform(TransformedDirectPosition.java:255)
at
org.geotools.coverage.grid.GridCoverage2D.toPoint2D(GridCoverage2D.java:559)
... 55 more
Caused by: org.opengis.referencing.operation.OperationNotFoundException: Bursa
wolf parameters required.
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperationStep(DefaultCoordinateOperationFactory.java:1072)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperationStep(DefaultCoordinateOperationFactory.java:1136)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperationStep(DefaultCoordinateOperationFactory.java:881)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperationStep(DefaultCoordinateOperationFactory.java:965)
at
org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperation(DefaultCoordinateOperationFactory.java:243)
at
org.geotools.referencing.operation.BufferedCoordinateOperationFactory.createOperation(BufferedCoordinateOperationFactory.java:254)
at
org.geotools.geometry.TransformedDirectPosition.setSourceCRS(TransformedDirectPosition.java:203)
... 57 more
-----------------------------------
The workaround could be substituting this line of code in
AbstractFeatureInfoResponse.execute method:
double[] pixelValues = coverage.evaluate(position,
(double[]) null);
with this one:
double[] pixelValues = null;
if (requestedCRS != null) {
final CoordinateReferenceSystem targetCRS =
coverage.getCoordinateReferenceSystem2D();
TransformedDirectPosition arbitraryToInternal = new
TransformedDirectPosition(requestedCRS, targetCRS, new
Hints(Hints.LENIENT_DATUM_SHIFT,Boolean.TRUE));
try {
arbitraryToInternal.transform(position);
} catch (TransformException exception) {
throw new
CannotEvaluateException(exception.getLocalizedMessage());
}
Point2D point2D =
arbitraryToInternal.toPoint2D();
pixelValues = coverage.evaluate(point2D,
(double[]) null);
}
else
pixelValues = coverage.evaluate(position,
(double[]) null);
This version allows to leverage on a LENIENT_DATUM_SHIFT Hint.
Daniele
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