[R-sig-Geo] long 0-360, shift to -180 to 180

[Andy Bunn]

Ah. That's perfect. Thanks Mike. Raster is a potent library!

> -----Original Message-----
> From: Michael Loranty [mailto:mloranty at whrc.org]
> Sent: Thursday, March 10, 2011 5:59 AM
> To: r-sig-geo; Andy Bunn
> Subject: Re: [R-sig-Geo] long 0-360, shift to -180 to 180
> 
> Hi Andy,
> 
> I think the rotate function in the raster package might be what you're
> looking for.
> 
> Hope things are well with you.
> 
> -Mike
> 
> dat <- matrix(data = 1:100, nrow=360, ncol = 360)
>  > bar <-
> raster(dat,xmn=0,xmx=356.25,ymn=-87.159094555863,ymx=87.159094555863,
> +              crs="+proj=longlat +datum=WGS84")
>  > bar
> class       : RasterLayer
> filename    :
> nrow        : 360
> ncol        : 360
> ncell       : 129600
> min value   : 1
> max value   : 100
> projection  : +proj=longlat +datum=WGS84
> extent      : 0, 356.25, -87.1591, 87.1591  (xmin, xmax, ymin, ymax)
> resolution  : 0.9895833, 0.4842172  (x, y)
> 
>  > bar2 <- rotate(bar)
>  > bar2
> class       : RasterLayer
> filename    :
> nrow        : 360
> ncol        : 360
> ncell       : 129600
> min value   : 1
> max value   : 100
> projection  : +proj=longlat +datum=WGS84
> extent      : -178.125, 178.125, -87.1591, 87.1591  (xmin, xmax, ymin,
> ymax)
> resolution  : 0.9895833, 0.4842172  (x, y)
> 
> 
> On Mar 10, 2011, at 6:00 AM, r-sig-geo-request at r-project.org wrote:
> 
> >
> > Message: 18
> > Date: Wed, 9 Mar 2011 16:18:17 -0800
> > From: Andy Bunn <Andy.Bunn at wwu.edu>
> > To: "r-sig-geo at r-project.org" <r-sig-geo at r-project.org>
> > Subject: [R-sig-Geo] long 0-360, shift to -180 to 180
> > Message-ID:
> >
> 	<7E6EA3F4372E474F8F3F850DD262FDA9125D914C82 at ExchMailbox3.univ.dir
> .wwu.edu
> > >
> >
> > Content-Type: text/plain; charset="us-ascii"
> >
> > I have a raster with longitude data over 0 to 360.
> >
> > bar <- raster(t(foo[,,
> > 1]),xmn=0,xmx=356.25,ymn=-87.159094555863,ymx=87.159094555863,
> >              crs="+proj=longlat +datum=WGS84")
> >
> > I'd like to shift those longitudes to -180 to 180. I tried paying
> > with the +long_wrap argument to crs but to no avail. Can somebody
> > help? I'll need to overlay and extract data from the negative side
> > (e.g., 100W or -100) and it would be nice to have the coordinates
> > the same.
> >
> > Thanks in advance,
> > Andy
> >
> >
> >> -----Original Message-----
> >> From: r-sig-geo-bounces at r-project.org [mailto:r-sig-geo-bounces at r-
> >> project.org] On Behalf Of Tom Gottfried
> >> Sent: Wednesday, March 09, 2011 1:40 PM
> >> To: r-sig-geo at r-project.org
> >> Subject: Re: [R-sig-Geo] predicting values from variofit function
> >>
> >> Hi Anna,
> >>
> >> Am 09.03.2011 21:25, schrieb Anna Gretschel:
> >>> Dear List,
> >>>
> >>> I have fitted a spherical function to my variogram using
> >> "variofit(...)"
> >>> from GeoR. Now I would like to predict some data with the function
> >>> "predict(object,...)" from package stats.
> >>
> >> Note that predict() is a generic function (see
> >> http://cran.r-project.org/doc/manuals/R-intro.html#Object-
> orientation)
> >> .
> >> I don't think there is a method in geoR that does what you want.
> >>
> >>> Does anyone know wether this
> >>> works and if it does how to do it?
> >>
> >> The package gstat has a method for objects of class gstat (see ?
> >> gstat,
> >> ?predict.gstat and the ASDAR book). You can coerce your variogram
> fit
> >> from geoR to the respective class used in package gstat with
> >> as.vgm.variomodel(). You can do kriging with krige.conv() from geoR
> >> too.
> >> But I think you have more options in gstat.
> >>
> >> regards,
> >> Tom
> >>
> >>>
> >>> Thanks a lot!
> >>> Anna
> >>>
> >>> _______________________________________________
> >>> R-sig-Geo mailing list
> >>> R-sig-Geo at r-project.org
> >>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> >>
> >> _______________________________________________
> >> R-sig-Geo mailing list
> >> R-sig-Geo at r-project.org
> >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> >
> >
> >
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> > End of R-sig-Geo Digest, Vol 91, Issue 10
> > *****************************************
> >
> 
>