[R] Problem with adding a raster and a brick

[Michael Sumner]

This is now fixed in development on RForge, you can try it out by
installing from there, or from the Github mirror with
devtools::install_github("rforge/raster/pkg/raster").

(To get fixes into raster email the maintainer directly - you might not get
a response but it'll be addressed).

Cheers, Mike.


On Thu, 24 May 2018 at 20:08 Michael Sumner <mdsumner using gmail.com> wrote:

>
>
>
> On Thu, 24 May 2018 at 18:41 Mark R Payne <markpayneatwork using gmail.com>
> wrote:
>
> Hi,
>
> I seem to be having a problem adding the following two raster objects
> together - one is a rasterLayer, the other is a rasterBrick. The extent,
> resolution, and origin are the same, so according to my understand it
> should work. The objects look like so:
>
> > obs.clim
> class : RasterLayer
> dimensions : 60, 200, 12000 (nrow, ncol, ncell)
> resolution : 0.5, 0.5 (x, y)
> extent : -70, 30, 50, 80 (xmin, xmax, ymin, ymax)
> coord. ref. : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
> data source :
> /home/mpayne/Documents/Predictability_engine/scratch/Bluefin/HadISST/
> obs_climatology.nc
> names : sst
> z-value : 1988-02-15
> zvar : sst
>
> > mdl.anom
> class : RasterBrick
> dimensions : 60, 200, 12000, 1 (nrow, ncol, ncell, nlayers)
> resolution : 0.5, 0.5 (x, y)
> extent : -70, 30, 50, 80 (xmin, xmax, ymin, ymax)
> coord. ref. : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
> data source :
>
> /home/mpayne/Documents/Predictability_engine/scratch/Bluefin/DCPP-hindcasts/IPSL-CM5A-LR/B.realmean/IPSL-CM5A-LR_S19610101_L000000_realmean_
> anom.nc
>
> names : X1961.08.16
> Date : 1961-08-16
> varname : tos
>
> When I try to add them together, I get the follow error:
>
> > mdl.val <- obs.clim + mdl.anom
> Error in .readRowsNetCDF(x = x, row = row, nrows = nrows, col = col, ncols
> = ncols) :
> no slot of name "band" for this object of class ".MultipleRasterData"
> >
>
> I can reproduce, with netcf-file-backed bricks. I would try
>
> obs.clim[[1]] + mdl.anom[[1]]
>
> or
>
> readAll(obs.clim) + readAll(mdl.anom)
>
> those differ mainly in what will happen to multi-layer versions of the
> files, the first will give just the first layer. The key is breaking the
> file-read-delay, both objects have no data in memory but the add operation
> invalidates and causes read to occur - but with a bug - (I will check in
> dev raster and report if necessary).
>
> FYI, R-Sig-Geo is generally a better forum for spatial stuff:
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>
> Cheers, Mike.
>
>
> I get the same error if I treat mdl.anom as a raster, or if they are both
> bricks. Any suggestions what could be going wrong? Installation details
> below
>
> Best wishes,
>
> Mark
>
> > R.version
> _
> platform x86_64-pc-linux-gnu
> arch x86_64
> os linux-gnu
> system x86_64, linux-gnu
> status
> major 3
> minor 4.2
> year 2017
> month 09
> day 28
> svn rev 73368
> language R
> version.string R version 3.4.2 (2017-09-28)
> nickname Short Summer
> >
> > packageDescription("raster")
> Package: raster
> Type: Package
> Title: Geographic Data Analysis and Modeling
> Version: 2.6-7
> Date: 2017-11-12
>
> > packageDescription("ncdf4")
> Package: ncdf4
> Version: 1.16
> Date: 2017-04-01
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> <http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
> --
> Dr. Michael Sumner
> Software and Database Engineer
> Australian Antarctic Division
> 203 Channel Highway
> Kingston Tasmania 7050 Australia
>
> --
Dr. Michael Sumner
Software and Database Engineer
Australian Antarctic Division
203 Channel Highway
Kingston Tasmania 7050 Australia

	[[alternative HTML version deleted]]