On Thu, 22 Oct 2009, Lukas Quehl wrote:
Hi, I have a problem with transferring vector maps from GRASS into R.
The "readVECT6" function is not working. I always get the message
"Fehler in vInfo(vname) : Vector information not found"
("Fehler"=Error). I did everything exactly as described in "Using
R-GRASS Interface". It is neither working with my own data nor with the
spearfish data. Other commands like "readRAST6" or "system(...)" are
working, at least the ones I tried. I have no clue how to fix this or
what I should do differently. Thank you for any help. Sincerely Lukas
I guess one of my messages got through, since you've included useful
information. vInfo() expects the output of v.info to be in English,
otherwise it cannot be parsed. Change to an English locale and it will
work.
By the way, does anyone know of a non-localised way of retrieving the
information needed - vInfo for bugsites returns:
points lines boundaries centroids areas islands faces
90 0 0 0 0 0 0
kernels
0
but if the points are called "Punkte", all bets are off!
Without this information, it is not possible to distinguish between vector
types for composing the v.out.ogr command parameters.
Will:
v.info -t bugsites
or
execGRASS("v.info", flags="t", parameters=list(map="bugsites"))
return English-parsable information irrespective of locale - it looks
like it does? If someone can confirm, I'll patch vInfo() to suit.
Roger
PS: Sorry if you already got this message, I had some problems with the spam
filter of my other e-mail address and therefore sent the message twice
System: Linux OpenSuse 10.3
GRASS 6.4.0RC5 (spearfish60):~ > R
R version 2.9.0 (2009-04-17)
Copyright (C) 2009 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
library(spgrass6)
Lade nötiges Paket: sp Lade nötiges Paket: rgdal
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 1.6.1, released 2009/05/11
Path to GDAL shared files:
Loaded PROJ.4 runtime: Rel. 4.6.1, 21 August 2008
Path to PROJ.4 shared files: (autodetected)
Lade nötiges Paket: XML
GRASS GIS interface loaded with GRASS version: 6.4.0RC5
and location: nc_spm_08
sessionInfo()
R version 2.9.0 (2009-04-17) i686-pc-linux-gnu
locale:
LC_CTYPE=de_DE.UTF-8;LC_NUMERIC=C;LC_TIME=de_DE.UTF-8;LC_COLLATE=de_DE.UTF-8;LC_MONETARY=C;LC_MESSAGES=de_DE.UTF-8;LC_PAPER=de_DE.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=de_DE.UTF-8;LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] spgrass6_0.6-9 XML_2.6-0 rgdal_0.6-19 sp_0.9-44
loaded via a namespace (and not attached):
[1] grid_2.9.0 lattice_0.17-22
test<-readVECT6("elev_lid792_bepts")
Fehler in vInfo(vname) : Vector information not found
traceback()
3: stop("Vector information not found") 2: vInfo(vname)
1: readVECT6("elev_lid792_bepts")
execGRASS("g.list",parameters=list(type="vect"))
---------------------------------------------- vector files available in mapset
<PERMANENT>:
P079214 elev_lid792_bepts poi_names_wake
... ... ...
#lists all available vector maps
execGRASS("v.info",parameters=list(map="elev_lid792_bepts"))
+----------------------------------------------------------------------------+
| Layer: elev_lid792_bepts |
| Mapset: PERMANENT |
| Location: nc_spm_08 |
| Datenbank: /home/lukas/grassdata |
| Titel: Rural area (in tile 792), bare earth lidar point cloud (p |
| Maßstab: 1:1 |
| Kartenformat: native |
| Name des Erzeugers: helena |
| Organisation: NC OneMap |
| Quelldatum: Mon Nov 6 14:11:59 2006 |
|----------------------------------------------------------------------------|
| Typ der Karte: Vektor (Level: 2) |
| |
| Anzahl Punkte: 118716 Anzahl Flächen: 0 |
| Anzahl Linien: 0 Anzahl Inseln: 0 |
| Anzhal Grenzen: 0 Anzahl faces: 0 |
| Anzahl Zentroid: 0 Anzahl Kerne: 0 |
| |
| Karte ist 3D: Yes |
| Anzahl der dblinks: 0 |
| |
| Projektion: x,y |
| N: 221229.985 S: 219580.011 |
| E: 639529.99 W: 637740.009 |
| B: 88.514 T: 134.493 |
| |
| Digitalisierungs-Schwellwert: 0 |
| Kommentare: |
| |
+----------------------------------------------------------------------------+
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [email protected]
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