Hello!
For the purposes of rendering a single-band grid coverage I am first
normalizing it to sample value range [0, 1]. I am using the DivideByConst JAI
operator which has served my well up until now.
The coverage samples are typically quite small, in the range of [0.0,
0.0035993857840289434]. I simply do:
Operations.DEFAULT.divideBy(coverage, new double[]{normalizationValue});
… where normalizationValue is 0.0035993857840289434 (I use the extrema operator
to find this value).
Should be straightforward I think but when I invoke the operator it throws an
exception saying:
SEVERE [se.havochvatten.symphony.exception.SymphonyWSExceptionMapper] (default
task-101) java.lang.IllegalArgumentException: Range [-∞ .. ∞] is not valid.:
java.lang.IllegalArgumentException: Range [-∞ .. ∞] is not valid.
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.Category.<init>(Category.java:324)
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.Category.<init>(Category.java:283)
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.processing.OperationJAI.deriveCategory(OperationJAI.java:840)
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.processing.OperationJAI.deriveSampleDimension(OperationJAI.java:789)
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.processing.OperationJAI.deriveGridCoverage(OperationJAI.java:573)
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.processing.OperationJAI.doOperation(OperationJAI.java:302)
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.processing.CoverageProcessor.doOperation(CoverageProcessor.java:575)
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.processing.CoverageProcessor.doOperation(CoverageProcessor.java:598)
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.processing.Operations.doOperation(Operations.java:759)
at
deployment.symphony-ws-1.2.0-SNAPSHOT.war//org.geotools.coverage.processing.Operations.divideBy(Operations.java:177)
I am using GeoTools 26.5.
I can see that the code on
org.geotools.coverage.Category.<init>(Category.java:324) explicitly checks for
this case the min or max value if the range is infinity, but not sure why the
range is deemed [-inf, inf], nor why my specific use case seems unsupported.
[Havochvatten]
Tobias Gerdin
Systemutvecklare, Konsult
Enheten för systemutveckling
Gullbergs Strandgata 15, 411 04 Göteborg
Box 11930, SE-404 39 Göteborg
tobias.ger...@havochvatten.se
www.havochvatten.se<https://www.havochvatten.se/>
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