Opened 8 years ago

#37 new defect

Datums with 7 parameter transformations does not work

Reported by: cjpersson Owned by:
Priority: major Milestone: FUTURE
Component: core library Version:
Keywords: Cc:

Description

All predefined datums that are defined with 7-parameter transforms gives completely wrong results when projecting. This applies to the datums IRE65, NZGD49 and OSGB36. This also means that all CRSs defined with with these datums fails conversions. This for instance includes the British National Grid systems.

The problem comes from that internally the last 4 parameters should be converted to different units than they are defined in (sek->rad, 1->1/1M). This is done if conversion parameters are defined with the +towgs84 parameter but not for predefined datums.

I have enclosed a patch that does conversions for datums.

Attachments (1)

datumbugfix.patch (2.2 KB ) - added by cjpersson 8 years ago.
Patch that fixes 7-parameter transforms for datums.

Download all attachments as: .zip

Change History (1)

by cjpersson, 8 years ago

Attachment: datumbugfix.patch added

Patch that fixes 7-parameter transforms for datums.

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