[GRASS-user] r.plane azimuth confusion

[Maris Nartiss]

Hello,

that's strange. I used 6.3.0 (Gentoo portage) and I got different
results with spearfish60 dataset:
azimuth=90 - dips to east;
azimuth=180 - dips to south.
It's not counter-clockwise as help page suggests and not same results You got.

Can You make same checks with spearfish dataset?

Maris.


2008/7/14, Roger Mason <rmason at esd.mun.ca>:
> Hello,
>
> I'm using r.plane to specifiy the orientation of geological boundaries
> as part of a method of producing fake geological maps.
>
> According to the documentation for r.plane the azimuth is taken
> counter clockwise from north.  If I specify azimuth=90 and, say,
> dip=40 then I expect to produce a plane dipping west.  If the top of
> the produced map is north that means the dip is towards the left of a
> printed page.  This is indeed what I get.
>
> When I specify azimuth=180 and dip=40 I expect to get a plane dipping
> due south, which would be towards the bottom of the page if the top of
> the page is north.  However, in this case the plane dips towards the
> top of the page.  This seems inconsistent with the first example.
>
> Am i misunderstanding something or is there an inconsistency?
>
> Thanks,
>
> Roger
>
> Grass 6.3.0
> Gentoo linux
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>