[Geotools-devel] [JIRA] (GEOT-5198) Parsing FITTED_CS WKT with affine transformation fails with ClassCastException

Alexey Valikov (JIRA) Tue, 25 Aug 2015 00:46:48 -0700

Title: Message Title

Alexey Valikov created an issue

GEOT-5198

Issue Type:	Bug
Affects Versions:	11.1
Assignee:	Unassigned
Components:	referencing
Created:	25/Aug/15 9:44 AM
Priority:	Low
Reporter:	Alexey Valikov

I want to define a coordinate system which "rotates" an existing coordinate system (say, Google Mercator). Please see the following question on GIS StackExchange:

http://gis.stackexchange.com/questions/159037/how-to-define-a-coordinate-reference-system-with-rotation-in-geoserver/159134#159134

This can be done using the FITTED_CS CRS:

 
                                                    FITTED_CS["BPAF", 
  PARAM_MT["Affine", 
    PARAMETER["num_row", 3], 
    PARAMETER["num_col", 3], 
    PARAMETER["elt_0_0", -0.5], 
    PARAMETER["elt_0_1", -0.8660254037844386], 
    PARAMETER["elt_0_2", 1487816.0], 
    PARAMETER["elt_1_0", 0.8660254037844386], 
    PARAMETER["elt_1_1", -0.5], 
    PARAMETER["elt_1_2", 6886579.0]], 
  PROJCS["WGS84 / Google Mercator", 
    GEOGCS["WGS 84", 
      DATUM["World Geodetic System 1984", 
        SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]], 
        AUTHORITY["EPSG","6326"]], 
      PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]], 
      UNIT["degree", 0.017453292519943295], 
      AXIS["Longitude", EAST], 
      AXIS["Latitude", NORTH], 
      AUTHORITY["EPSG","4326"]], 
    PROJECTION["Mercator_1SP"], 
    PARAMETER["semi_minor", 6378137.0], 
    PARAMETER["latitude_of_origin", 0.0], 
    PARAMETER["central_meridian", 0.0], 
    PARAMETER["scale_factor", 1.0], 
    PARAMETER["false_easting", 0.0], 
    PARAMETER["false_northing", 0.0], 
    UNIT["m", 1.0], 
    AXIS["x", EAST], 
    AXIS["y", NORTH], 
    AUTHORITY["EPSG","900913"]], 
  AUTHORITY["EPSG","8011113"]]
 
                                                

Unfortunately, GeoTools fails with the class cast exception.

The reason is that when the inverse transformation is created in ProjectiveTransform, it is always ProjectiveTransform:

https://github.com/geotools/geotools/blob/aa0d0346e4bb4a5a2055559c22d2b12ded7cbd20/modules/library/referencing/src/main/java/org/geotools/referencing/operation/transform/ProjectiveTransform.java#L509

There is a createInverse(...) method, which is overridden by subclasses, but it is not called in inverse(). This is why I get a class cast exception here although the class does override the createInverse(...) method here.

The fix is trivial: use createInverse(matrix) instead of new ProjectiveTransform(matrix).

I'll provide a pull request.

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[Geotools-devel] [JIRA] (GEOT-5198) Parsing FITTED_CS WKT with affine transformation fails with ClassCastException

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