[Proj] proj4 specifications for a rotated latlon grid on a sphere?

[Hermann Peifer]

Indeed, I forgot to mention this switch. Sorry.

 From my .bash_history, I see that I have also been using: 
+to_meter=.0174532925199 (which has the same effect, if I remember 
correctly).

Hermann


On 2012-08-14 5:51, Mikael Rittri wrote:
> That's interesting, Hermann, I didn't know about ob_tran.
>
> After some googling, I found an older post, also by you, where
> you also used the flag
>
>      -m 57.2957795130823
>
> which seems to be needed to get degrees instead of radians.
>
> See
>
> http://lists.maptools.org/pipermail/proj/2011-October/005906.html
>
> and
>
> http://lists.maptools.org/pipermail/proj/2011-October/005913.html
>
> and also
>
> http://lists.maptools.org/pipermail/proj/2010-June/005234.html
>
>
> On the related topic, here is a reference saying that meteorological
> long/lat data on a sphere needs no datum shift to WGS84:
>
> http://www.ie.unc.edu/cempd/projects/mims/spatial/grids_ellipsoids_map_proj.html
>
>
> Regards,
>
> Mikael Rittri
> Carmenta
> Sweden
> http://www.carmenta.com
>
> -----Original Message-----
> From: proj-bounces at lists.maptools.org [mailto:proj-bounces at lists.maptools.org] On Behalf Of Hermann Peifer
> Sent: Tuesday, August 14, 2012 1:50 AM
> To: PROJ.4 and general Projections Discussions
> Subject: Re: [Proj] proj4 specifications for a rotated latlon grid on a sphere?
>
> On 2012-08-13 12:19, Martin Ivanov wrote:
>> Dear PROJ4 users,
>>
>> I have a rotated latitude-longitude grid with coordinates of the north
>> pole POLE_LAT=39.25 and POLE_LON=-162.
>> The data are on a sphere with radius 6371 km. Is it possible to define
>> proj4 specifications for this grid...
>
> You could try:
> +proj=ob_tran +o_proj=latlon +o_lon_p=-162 +o_lat_p=39.25 +lon_0=180
>
> Hermann
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj
>