readVECT6 temporary failure
On Wed, 2 Apr 2008, Facundo Mu?oz wrote:
Hello list,
i've been dealing all day with this, and i can't find the problem.
It suddenly begun to happen.
Im working with GRASS 6.2.3 under CygWin, and with R 6.2.2 with the
latest libraries (in fact, while trying to solve this problem, i removed
all R versions, and reinstalled the latest. But is still failing).
This is it:
i start GRASS, and open the location i'm working with.
then i start R from GRASS console, load spgrass6 library, and i transfer
a vector map:
GRASS> r --no-save
R> library(spgrass6)
R> medidas <- readVECT6("medidas")
everything goes fine so far.
Is there a stray *.dbf file in the temporary directory? OGR with the ESRI
Shapefile driver does not like extra *.dbf or other irregularities.
In situations like this, just side-step readVECT6, use
system("r.out.ogr ...") to an arbitrary directory, and readOGR() from
there. There are multiple components operating, so complete control is not
possible, but I have seen problems with stray *.dbf files before that were
hard to debug.
Roger
but if i try to transfer some other vector map, it fails. In fact, if i just try to export a vector map to the temporary directory used by readVECT then: v.out.ogr input=ejes_1 type=line,boundary dsn=/home/usuario/grassdata/Valencia/geo_info/.tmp/facundo olayer=mmtest layer=1 format=ESRI_Shapefile ERROR 4: Unable to open /home/usuario/grassdata/Valencia/geo_info/.tmp/facundo/medidas.shx or /home/usuario/grassdata/Valencia/geo_info/.tmp/facundo/medidas.SHX. ERROR 4: Failed to open shapefile /home/usuario/grassdata/Valencia/geo_info/.tmp/facundo/medidas.shp. It may be corrupt. No se puede abrir el origen de datos OGR '/home/usuario/grassdata/Valencia/geo_info/.tmp/facundo' Note that while i tried to write a file called mmtest, the error talks about de previously wwritten file: medidas Besides, i can write fine to any other directory. So i go see what's going on in there, and i verify that after the first transfer is done there remains those files medidas.dbf and medidas.shp, which are responsible of the failure, since if i remove them manually, the failure stops. the problem arises only after de use of readVECT6. If i try to export a map to that directory it doesn't "hang" the directory. it looks as if the use of readVECT6 blocked the directory. Thank you in advance. Departament d'Estad?stica i Investigaci? Operativa Universitat de Val?ncia (Estudi General) Facultat de Matem?tiques, Dr. Moliner 50, 46100 Burjassot, Spain. (+34) 96 354 3987, fax: (+34) 96 354 3238 e-mail: Facundo.Munoz at uv.es
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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: Roger.Bivand at nhh.no