[R-sig-Geo] Issue with rgrass7 and readRAST

[Thomas Adams]

Hi Roger!

Here is what was written in
/media/teaiii/development/grass/greensboro_mercator/teaiii/.tmp/teaiii-Leopard-WS:

drwxr-xr-x 3 teaiii teaiii   4096 Sep 23  2019 ..
-rw-r--r-- 1 teaiii teaiii 131072 Jul  9 10:02 801.0.gpkg
-rw-r--r-- 1 teaiii teaiii 131072 Jul  9 10:04 466.0.gpkg
-rw-r--r-- 1 teaiii teaiii      0 Jul  9 20:32 801.0
-rw-r--r-- 1 teaiii teaiii      0 Jul  9 22:40 188.0
-rw-r--r-- 1 teaiii teaiii      0 Jul  9 22:51 222.0

And there is plenty of space on the disk drive...

Tom

On Sat, Jul 11, 2020 at 9:26 AM Roger Bivand <Roger.Bivand using nhh.no> wrote:

> Tom
>
> On Fri, 10 Jul 2020, Thomas Adams wrote:
>
> > Hi,
> >
> > I'm using R in combination with GRASS GIS 7.8.3, attempting to read a
> GRASS
> > raster file into R with the rgrass7 interface. I have done this kind of
> > thing countless times previously without problems. It's quite possible I
> am
> > running into memory issues, but my Ubuntu 18.04 Linux computer has 32 GB
> of
> > RAM.
> >
>
> I have not succeeded in reproducing this, I'm afraid. I created a location
> with cell counts to match, and ran r.out.bin first to check whether there
> were any issues writing the data to a temporary file. Then I ran the
> equivalent of your command (readRAST()), again without problems. I'm on a
> 16 GB PC, so the problem is puzzling. I'm curious about the free space on
> your
>
> /media/teaiii/development/grass/greensboro_mercator/teaiii/.tmp/
> teaiii-Leopard-WS
>
> directory. Did you check whether any output arrived there, since the error
> message is coming from r.out.bin?
>
> The error is on line 53 in raster/r.out.bin/main.c, when the system
> function fwrite() returns an error.
>
> Thanks for your patience.
>
> Roger
>
>
> > My GRASS raster file:
> >
> > Type of Map:  raster               Number of Categories: 0
> > Data Type:    CELL
> > Rows:         22663
> > Columns:      28794
> > Total Cells:  652558422
> > ~90m resolution
> >
> > Using...
> >
> > srtm <- readRAST("mozambique_srtm_patch",cat=FALSE)
> >
> > After quite some time, I get...
> >
> > Error in execGRASS("r.out.bin", flags = rOutBinFlags, input = vname[i],
> :
> >  The command:
> > r.out.bin -b -i input=mozambique_srtm_patch
> >
> output=/media/teaiii/development/grass/greensboro_mercator/teaiii/.tmp/teaiii-Leopard-WS/mozambique_srtm_patch
> > bytes=4 null=-81
> > produced an error (1) during execution:
> > Creating BIL support files...
> > Exporting raster as integer values (bytes=4)
> > ERROR: Error writing data
> > In addition: Warning messages:
> > 1: In showSRID(uprojargs, format = "PROJ", multiline = "NO") :
> >  Discarded ellps unknown in CRS definition: +proj=merc +lat_ts=0 +lon_0=0
> > +x_0=0 +y_0=0 +R=6378137 +units=m +no_defs
> > 2: In showSRID(uprojargs, format = "PROJ", multiline = "NO") :
> >  Discarded datum unknown in CRS definition
> >
> > Libraries loaded include: sp, rgrass7, rgdal, raster...
> >
> > Any thoughts?
> >
> > Best,
> > Tom
> >
> >
>
> --
> Roger Bivand
> Department of Economics, Norwegian School of Economics,
> Helleveien 30, N-5045 Bergen, Norway.
> voice: +47 55 95 93 55; e-mail: Roger.Bivand using nhh.no
> https://orcid.org/0000-0003-2392-6140
> https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en
>


-- 
Thomas E Adams, III
1724 Sage Lane
Blacksburg, VA 24060
tea3rd using gmail.com (personal)
tea using terrapredictions.org (work)

1 (513) 739-9512 (cell)

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