Coordinate Reference Systems created from the EPSG database have a wrong
BursaWolf ppm parameter
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Key: GEOT-3482
URL: http://jira.codehaus.org/browse/GEOT-3482
Project: GeoTools
Issue Type: Bug
Components: core referencing
Reporter: Julien
Priority: Critical
The parsing of the EPSG database has an issue for BursaWolf parameters: the ppm
(the last parameter) is interpreted as being in microradians and having to be
converted into arc seconds, although it is unitless. Thus systems created from
the EPSG database which contain a Position Vector Transformation will have a
ppm parameter equal to ppm_EPSG * 10e-6 / (1 / 3600.0 * Pi / 180)) instead of
just being ppm_EPSG.
This can be verified by creating a system from the EPSG database, exporting it
to WKT and taking a look at the last parameter of the TOWGS84 tag.
According to my analysis, this is due to a mistake in the code of
setBursaWolfParameter in AbstractEpsgFactory and DirectEpsgFactory:
if (code >= 8605) {
if (code <= 8607) target = SI .METER;
else if (code <= 8710) target = NonSI.SECOND_ANGLE;
else if (code == 8611) target = Units.PPM;
}
Code 8611 effectively corresponds to the code of the ppm parameter. But because
8611<=8710, the target for the ppm parameter is always interpreted as
NonSI.SECOND_ANGLE (the line "else if (code == 8611) target = Units.PPM;" is
never executed).
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