Re: Low latitude RTP / RTE transformation

Lester,

Its is well known that the Reduction-To-Pole operators simply do not 
work at low latitudes (~10-15 deg) and the problem of an RTE is also 
harder than the RTP.
For cases like this, or others like for instances the interpolation with 
break lines, it is normally necessary that one of the developers has a 
personal interest in the problem so that the result ends up in GMT. That 
was what happened with grdredpol and it may happen again, but in an 
uncertain future.
However, things could go much faster if someone had open source code to 
contribute (but not GPL'de one).

Joaquim

> Hello,
>
> With GMT5 we now have a proper RTP transform tool (GRDREDPOL) for 
> performing both the classic (constant field vector) and differential 
> (variable field vector) for working on large areas. However, RTP at 
> low latitudes is unstable and the results are skewed.
>
> Would it be feasible to include either a low-latitude correction for 
> the RTP and/or a separate "Reduce-to-Equator RTE" program?
>
> Cheers
> Lester
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