[geotk] [JIRA] Created: (GEOTK-115) Google projection sometime use ellipsoidal formulas instead than spherical

Martin Desruisseaux (JIRA) jira at geomatys.com
Fri Sep 3 03:53:55 EDT 2010

Google projection sometime use ellipsoidal formulas instead than spherical

                 Key: GEOTK-115
                 URL: http://jira.geotoolkit.org/browse/GEOTK-115
             Project: Geotoolkit
          Issue Type: Bug
          Components: Referencing
    Affects Versions: 3.14, 3.13, 3.12, 3.11, 3.10, 3.09, 3.08, 3.07, 3.06, 3.05, 3.04, 3.03, 3.02, 3.01, 3.00
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux
             Fix For: 3.15

In the particular case where:

* The projection is supposed to use spherical formulas despite having an ellipsoidal datum (e.g. the Google projection).
* The {{transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)}} method is invoked.
* {{srcPts == dstPts}} and {{srcOff == dstOff}}.

In such case, {{Mercator}} use ellipsoidal formulas. It is required to use spherical formulas instead.

On a related topic, conversion from Google projection to Mercator should not be the identity transform even if the projection parameters and the datum are the same, because the different formulas used by Google.

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