[R-sig-Geo] a problem with readOGR

[Roger Bivand]

On Fri, 18 Jan 2013, Pascal Oettli wrote:

> Hello,
>
> To me, the following works:
>
> setwd("D:/mydirectory/")
> carte = readOGR(getwd(),layer="COMMUNE")

Yes, thanks for the reports. In the changes made for 0.8-*, an attempt is 
made for the ESRI Shapefile driver to read the LDID byte in the *.dbf file 
to indicate which character set is used for encoding. The current code is:

con <- file(paste(dsn, .Platform$file.sep, layer, ".dbf", sep=""), "rb")

which will fail if dsn is the shapefile itself, but pass if dsn is the 
data source name (the directory in which the shapefiles are placed). I'll 
try to patch this so that both ways of reading shapefiles work again, and 
report back when the fix is committed. The failure was in ogrInfo() inside 
readOGR() - running traceback() after the error would show this.

Best wishes,

Roger

>
> HTH,
> Pascal
>
> Le 18/01/2013 08:35, Julien Salanié a écrit :
>> Hello,
>> 
>> I was working on a script (which was working perfectly). For some reason
>> I updated my packages and readOGR() is not working anymore. I was able
>> to read those data before. I decided to reinstall everything, and it is
>> still not working. Does anyone has the same problem. Here is the code,
>> the warning and session info :
>> 
>> CODE:
>> setwd("D:/mydirectory");
>> carte = readOGR("COMMUNE.shp",layer="COMMUNE");
>> 
>> COMMUNE.shp .dbf. and all other required files are in D:/mydirectory. I
>> was able to build the map before the problem arised.
>> 
>> WARNING:
>> [8] ERREUR:
>> impossible d'ouvrir la connexion
>> 
>> That is : "Impossible to open connection".
>> 
>> SESSION INFO:
>>   > sessionInfo();
>> R version 2.15.2 (2012-10-26)
>> Platform: x86_64-w64-mingw32/x64 (64-bit)
>> 
>> locale:
>> [1] LC_COLLATE=French_France.1252 LC_CTYPE=French_France.1252
>> LC_MONETARY=French_France.1252 LC_NUMERIC=C
>> LC_TIME=French_France.1252
>> 
>> attached base packages:
>> [1] splines   grid      stats     graphics  grDevices utils datasets
>> methods   base
>> 
>> other attached packages:
>>    [1] mgcv_1.7-22     sfsmisc_1.0-23  spdep_0.5-56 coda_0.16-1
>> deldir_0.0-21   maptools_0.8-22 foreign_0.8-52 nlme_3.1-107
>> Matrix_1.0-9    boot_1.3-7
>> [11] rgdal_0.8-3     lattice_0.20-13 geoR_1.7-4 sp_1.0-5
>> Rcmdr_1.9-3     car_2.0-15      nnet_7.3-5 MASS_7.3-22
>> 
>> loaded via a namespace (and not attached):
>> [1] LearnBayes_2.12     RandomFields_2.0.59 splancs_2.01-32 tcltk_2.15.2
>> 
>> 
>> Thank you very much for your help. Best regards. Julien
>> 
>> 
>> 
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>> 
>
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-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
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