Hi,
I was using GeoTiffReader from GT2 to parse a GeoTiff file when I came
accross the exception at the end of this message.
Now, according to section 2.6.1 of the GeoTiff specification (http://www.remotesensing.org/geotiff/spec/geotiff2.6.html#2.6
), when the ModelTransformationTag is not available
and there is a single ModelTiePoint, the transformation from between
model space and raster space can be derivied using the information
from the tie point and the ModelPixelScale data.
The matrix representing the transformation is shown at the
aforementioned link.
However, the method createUserDefinedProjectionParameter() in
GeoTiffMetadata2CRSAdapter.java is not creating the proper
transformation according that section of the GeoTiff specification.
Instead, that method
is choking because no ProjCoordTransGeoKey is available in the GeoTiff
file even though there is sufficient information available for
deriving what the projection should be.
The simplest solution is to compute the matrix representation of the
user-defined transformation and create the proper ProjectionCRS object
based on that.
However, before I submit a patch, I need to know if I'm on the right
path. Am I missing anything from the specification ?
Thanks,
Romeo
org.geotools.data.DataSourceException: GEOTIFF Module Error Report
GeoTiffMetadata2CRSAdapter
::createUserDefinedProjectionParameter(String name):User defined
projections must specify coordinate transformation code in
ProjCoordTransGeoKey
ModelPixelScaleTag: [0.0048042791094009985,0.004804279109400998,0.0]
ModelTiePointTag: (1 tie points)
TP #0: [0.0,0.0,0.0] -> [-2.760058348350874,8.505976163194468,0.0]
ModelTransformationTag: NOT AVAILABLE
GeoKey #1: Key = 1, Value = null
GeoKey #2: Key = 1024, Value = 1
GeoKey #3: Key = 1025, Value = 1
at org.geotools.gce.geotiff.GeoTiffReader.<init>(GeoTiffReader.java:
256)
at GeoTiff.TiffTags$GetImageTask.displayImage(TiffTags.java:234)
at GeoTiff.TiffTags$GetImageTask.run(TiffTags.java:154)
at java.lang.Thread.run(Thread.java:637)
Caused by:
org.geotools.coverage.grid.io.imageio.geotiff.GeoTiffException:
GEOTIFF Module Error Report
GeoTiffMetadata2CRSAdapter
::createUserDefinedProjectionParameter(String name):User defined
projections must specify coordinate transformation code in
ProjCoordTransGeoKey
ModelPixelScaleTag: [0.0048042791094009985,0.004804279109400998,0.0]
ModelTiePointTag: (1 tie points)
TP #0: [0.0,0.0,0.0] -> [-2.760058348350874,8.505976163194468,0.0]
ModelTransformationTag: NOT AVAILABLE
GeoKey #1: Key = 1, Value = null
GeoKey #2: Key = 1024, Value = 1
GeoKey #3: Key = 1025, Value = 1
at
org
.geotools
.coverage
.grid
.io
.imageio
.geotiff
.GeoTiffMetadata2CRSAdapter
.createUserDefinedProjectionParameter(GeoTiffMetadata2CRSAdapter.java:
1140)
at
org
.geotools
.coverage
.grid
.io
.imageio
.geotiff
.GeoTiffMetadata2CRSAdapter
.createUserDefinedPCS(GeoTiffMetadata2CRSAdapter.java:695)
at
org
.geotools
.coverage
.grid
.io
.imageio
.geotiff
.GeoTiffMetadata2CRSAdapter
.createProjectedCoordinateSystem(GeoTiffMetadata2CRSAdapter.java:297)
at
org
.geotools
.coverage
.grid
.io
.imageio
.geotiff
.GeoTiffMetadata2CRSAdapter
.createCoordinateSystem(GeoTiffMetadata2CRSAdapter.java:234)
at
org.geotools.gce.geotiff.GeoTiffReader.getHRInfo(GeoTiffReader.java:308)
at org.geotools.gce.geotiff.GeoTiffReader.<init>(GeoTiffReader.java:
235)
... 3 more
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