[Geotools-devel] [jira] (GEOT-4627) NetCDF reader applies an incorrect affine transformation

Wed, 04 Dec 2013 00:10:06 -0800

Issue Type: Bug Bug
Assignee: Simone Giannecchini
Components: coverage, unsupported
Created: 04/Dec/13 2:06 AM
Description:

When doing a read without any parameters using NetCDFReader, the reader still applies an affine transformation, while it should just return the data untouched.
A side effect of this transformation is an exception when the yScale of said transformation is negative, which occurs in a lot of gridToWorld transforms.

I traced back part of the problem to this todo:

// TODO: Check for center/corner anchor point
            request.setDomainSubset(requestedRasterArea, ReferencedEnvelope.reference(requestedBoundingBox));



and in setDomainSubset:




final GridToEnvelopeMapper mapper = new GridToEnvelopeMapper(
                new GridEnvelope2D(rasterArea), new ReferencedEnvelope(worldArea));
        mapper.setPixelAnchor(PixelInCell.CELL_CORNER);
        this.gridToWorldTransform = (MathTransform2D) mapper.createTransform();





So this code assumes that netcdf uses cell corners, while other parts seem to use cell centers to map pixels to coordinates.
Project: GeoTools
Priority: Major Major
Reporter: Jeroen Dries
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