[R-sig-Geo] raster CRS changes on tis own

[Agustin Lobo]

Sorry I forgot my session info:
> sessionInfo()
R version 2.15.2 (2012-10-26)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
 [7] LC_PAPER=C                 LC_NAME=C
LC_ADDRESS=C               LC_TELEPHONE=C
LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] rgdal_0.7-5   raster_2.0-12 sp_0.9-99

loaded via a namespace (and not attached):
[1] grid_2.15.2     lattice_0.19-30 tools_2.15.2

Agus

On Tue, Nov 13, 2012 at 10:41 AM, Agustin Lobo <alobolistas at gmail.com> wrote:
> Hi!
> I modify the CRS of a raster object:
>> vinedomosaicMCA03 <- brick(paste(mosdir,"mosaico_envi.dat",sep="/"))
>> proj <- CRS("+init=epsg:3042")
>> proj
> CRS arguments:
>  +init=epsg:3042 +proj=utm +zone=30 +ellps=GRS80
> +towgs84=0,0,0,0,0,0,0 +units=m +no_defs
>> projection(vinedomosaicMCA03) <- proj
>> vinedomosaicMCA03
> class       : RasterBrick
> dimensions  : 1486, 1162, 1726732, 6  (nrow, ncol, ncell, nlayers)
> resolution  : 0.170881, 0.170881  (x, y)
> extent      : 578587.4, 578785.9, 4722025, 4722279  (xmin, xmax, ymin, ymax)
> coord. ref. : +init=epsg:3042 +proj=utm +zone=30 +ellps=GRS80
> +towgs84=0,0,0,0,0,0,0 +units=m +no_defs
> data source : /media/Iomega_HDD/UAVetal/vinedo/Clara_final/mosaico_envi.dat
> names       : mosaico_envi.1, mosaico_envi.2, mosaico_envi.3,
> mosaico_envi.4, mosaico_envi.5, mosaico_envi.6
>
> But then, after a reordering, the CRS changes again on its own:
>> vinedomosaicMCA03v2 <- subset(vinedomosaicMCA03,c(3,1,2,4,5,6))
>> vinedomosaicMCA03v2
> class       : RasterStack
> dimensions  : 1486, 1162, 1726732, 6  (nrow, ncol, ncell, nlayers)
> resolution  : 0.170881, 0.170881  (x, y)
> extent      : 578587.4, 578785.9, 4722025, 4722279  (xmin, xmax, ymin, ymax)
> coord. ref. : +proj=utm +zone=30 +ellps=WGS84 +towgs84=0,0,0,0,0,0,0
> +units=m +no_defs
> names       : mosaico_envi.3, mosaico_envi.1, mosaico_envi.2,
> mosaico_envi.4, mosaico_envi.5, mosaico_envi.6
> min values  : NA, NA, NA, NA, NA, NA
> max values  : NA, NA, NA, NA, NA, NA
>
> The correct CRS is conserved if I write to GTiff:
>> projection(vinedomosaicMCA03v2) <- proj
>> vinedomosaicMCA03v2
> class       : RasterStack
> dimensions  : 1486, 1162, 1726732, 6  (nrow, ncol, ncell, nlayers)
> resolution  : 0.170881, 0.170881  (x, y)
> extent      : 578587.4, 578785.9, 4722025, 4722279  (xmin, xmax, ymin, ymax)
> coord. ref. : +init=epsg:3042 +proj=utm +zone=30 +ellps=GRS80
> +towgs84=0,0,0,0,0,0,0 +units=m +no_defs
> names       : mosaico_envi.3, mosaico_envi.1, mosaico_envi.2,
> mosaico_envi.4, mosaico_envi.5, mosaico_envi.6
> min values  : NA, NA, NA, NA, NA, NA
> max values  : NA, NA, NA, NA, NA, NA
>
>> writeRaster(vinedomosaicMCA03v2,file="mosaico_enviv2",overwrite=T,format="GTiff")
> class       : RasterBrick
> dimensions  : 1486, 1162, 1726732, 6  (nrow, ncol, ncell, nlayers)
> resolution  : 0.170881, 0.170881  (x, y)
> extent      : 578587.4, 578785.9, 4722025, 4722279  (xmin, xmax, ymin, ymax)
> coord. ref. : +proj=utm +zone=30 +ellps=GRS80 +units=m +no_defs
> data source : /media/Iomega_HDD/UAVetal/vinedo/RNavarra/mosaico_enviv2.tif
> names       : mosaico_enviv2.1, mosaico_enviv2.2, mosaico_enviv2.3,
> mosaico_enviv2.4, mosaico_enviv2.5, mosaico_enviv2.6
> min values  : 0, 0, 0, 0, 0, 0
> max values  : 175, 224, 179, 199, 196, 204
>
> But it is modified if I write to ENVI format:
>
>> writeRaster(vinedomosaicMCA03v2,file="mosaico_enviv2",overwrite=T,format="ENVI")
> class       : RasterBrick
> dimensions  : 1486, 1162, 1726732, 6  (nrow, ncol, ncell, nlayers)
> resolution  : 0.170881, 0.170881  (x, y)
> extent      : 578587.4, 578785.9, 4722025, 4722279  (xmin, xmax, ymin, ymax)
> coord. ref. : +proj=utm +zone=30 +datum=NAD27 +units=m +no_defs
> +ellps=clrk66 +nadgrids=@conus, at alaska, at ntv2_0.gsb, at ntv1_can.dat
> data source : /media/Iomega_HDD/UAVetal/vinedo/RNavarra/mosaico_enviv2.envi
> names       : mosaico_enviv2.1, mosaico_enviv2.2, mosaico_enviv2.3,
> mosaico_enviv2.4, mosaico_enviv2.5, mosaico_enviv2.6
> min values  : 0, 0, 0, 0, 0, 0
> max values  : 175, 224, 179, 199, 196, 204
>
>
> Is this a bug in raster or rgdal, or am I doing something wrong?
>
> Agus