Opened 8 years ago

Last modified 8 years ago

#3876 new enhancement

UTM class to support other TM based national grids

Reported by: Polarbear Owned by: team
Priority: normal Milestone:
Component: Core Version:
Keywords: UTM, national grids Cc:


It would be good if support for national TM projections could be considered in the generic UTM implementation currently going on.

This might be as simple as providing an interface for some core parameters.

E.g. I successfully hacked the current UTM 33 stub by using 8.0 as the centre meridian, and suddenly all my Irish TM references were orthogonal...

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Change History (3)

comment:1 Changed 8 years ago by stoecker

Well, theoretically setting the meridian is already implemented, only currently the values are ignored when initializing the class. I had no time yet to fix that issue. Mainly it is to read and use the first value of the list given as argument (including validity checks).

comment:2 Changed 8 years ago by Polarbear

currently in, the zone and the UTMScaleFactor are wired at the beginning of the
class implementation, while the UTMCentralMeridianDeg is computed from the zone.

National TMs can have scale factors, central meridians and true/false origins different
from UTM, for example

As I assume the core calculation is the same I thought all parameters could be kept adjustable.

In other words, keeping the generic TM calculation separate from the UTM specifics.

comment:3 Changed 8 years ago by stoecker

See getPreferences() and setPreferences() at end of file (the two with TODO's inside). Currently only zone is handled as prefs (or not yet handled - TODO), others could be added. They will be presented in preferences dialog when UTM is choosen.

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