[R-sig-Geo] Problems reading shapefiles in R

Felipe Carrillo mazatlanmexico at yahoo.com
Tue Apr 12 00:19:18 CEST 2011 

So far I have only used your package(s) once or twice to help somebody with a 
question. My type of work doesn't require the use of that software but if 
sometime I am required to use it, I will take the time to report 
bugs if found. Right now, I am too busy to make a reproducible example for you 
but again, coincidence or not the error messages dissapeared when I removed that 
package from my library. This list might be diffrent than the R list because I 
see this kind of advice there without complaints. I will try to watch what I 
suggest from now on..Good job with you packages though.
 
Felipe D. Carrillo
Supervisory Fishery Biologist
Department of the Interior
US Fish & Wildlife Service
California, USA
http://www.fws.gov/redbluff/rbdd_jsmp.aspx




----- Original Message ----
> From: Roger Bivand <Roger.Bivand at nhh.no>
> To: Felipe Carrillo <mazatlanmexico at yahoo.com>
> Cc: Manuel Spínola <mspinola10 at gmail.com>; r-sig-geo at r-project.org
> Sent: Mon, April 11, 2011 12:54:43 AM
> Subject: Re: [R-sig-Geo] Problems reading shapefiles in R
> 
> On Sun, 10 Apr 2011, Felipe Carrillo wrote:
> 
> > Mr Bivand, that's not unmotivated advice and I am not trying to mislead 
>anybody. That exact thing that Manuel is describing happened to me and it 
>got fixed by removing the rgeos package from my library.
> 
> Then please respect the implicit contract in all use of open source software! 
>Please inform the maintainer of the packages (me) with a fully reproducible 
>case, so that we may benefit from your discovery by identifying and removing the 
>cause.
> 
> As I stated, both rgeos and maptools are thoroughly tested on multiple 
>platforms, so your diagnosis seems unlikely, but the way you repay those who 
>write and maintain the software you benefit from is by documenting and reporting 
>irregularities.
> 
> Until I receive your reproducible case, I will assert that your problem is 
>caused by something else, specific to your platform and installation, and that 
>your advice is inappropriate with repect to the problem reported by the original 
>poster:
> 
> library(maptools)
> dir <- system.file("shapes", package="maptools")
> file.copy(paste(dir, "sids.shp", sep="/"), td)
> file.copy(paste(dir, "sids.shx", sep="/"), td)
> sids <- readShapeSpatial(paste(td, "sids.shp", sep="/"))
> sids <- readShapeSpatial(paste(td, "sids", sep="/"))
> sids <- readShapePoly(paste(td, "sids.shp", sep="/"))
> library(rgdal)
> sids <- readOGR(td, "sids")
> 
> (missing DBF file) reproduce the error messages correctly (maptools 0.8-6). I 
>get a different error message from rgdal (0.6-36) with GDAL 1.8.0, but as we 
>have neither the output of sessionInfo() from the original poster, not the 
>version information printed by rgdal on load, the difference may be from a 
>different version of GDAL. Would the original poster see different error 
>messages after running update.packages()?
> 
> Roger
> 
> >  
> > Felipe D. Carrillo
> > Supervisory Fishery Biologist
> > Department of the Interior
> > US Fish & Wildlife Service
> > California, USA
> > http://www.fws.gov/redbluff/rbdd_jsmp.aspx
> > 
> > 
> > 
> > 
> > ----- Original Message ----
> >> From: Roger Bivand <Roger.Bivand at nhh.no>
> >> To: Felipe Carrillo <mazatlanmexico at yahoo.com>
> >> Cc: Manuel Spínola <mspinola10 at gmail.com>; r-sig-geo at r-project.org
> >> Sent: Sun, April 10, 2011 12:15:51 PM
> >> Subject: Re: [R-sig-Geo] Problems reading shapefiles in R
> >> 
> >> On Sun, 10 Apr 2011, Felipe Carrillo wrote:
> >> 
> >> > Manuel:
> >> > As a test, delete the rgeos package from your library and run one of the
> >> > commands again. You can always install the package back if you need it.
> >> 
> >> Please do not give unmotivated advice on the list, as it will mislead. There 
>is no interaction between rgeos and functions for reading vector objects - if 
>you believe otherwise, please report this with a reproducible case. Bad advice 
>is worse than no advice.
> >> 
> >> The obvious place to check is:
> >> 
> >> list.files(path="C:/ProyectosRespacial/ICE/SIG_Biotica_PHED",
> >>   pattern="AI_BIOTICA_010411_CRTM05")
> >> 
> >> which must show at least:
> >> 
> >> "AI_BIOTICA_010411_CRTM05.dbf" "AI_BIOTICA_010411_CRTM05.shp" 
>"AI_BIOTICA_010411_CRTM05.shx"
> >> 
> >> for "AI_BIOTICA_010411_CRTM05" to be a shapefile. The error messages show 
>that "AI_BIOTICA_010411_CRTM05.dbf" is missing, so please check that it is 
>present first.
> >> 
> >> Hope this clarifies,
> >> 
> >> Roger
> >> 
> >> >  
> >> > Felipe D. Carrillo
> >> > Supervisory Fishery Biologist
> >> > Department of the Interior
> >> > US Fish & Wildlife Service
> >> > California, USA
> >> > http://www.fws.gov/redbluff/rbdd_jsmp.aspx
> >> >
> >> >
> >> >
> >> >
> >> > ----- Original Message ----
> >> >> From: Manuel Spínola <mspinola10 at gmail.com>
> >> >> To: r-sig-geo at r-project.org
> >> >> Sent: Sun, April 10, 2011 9:54:20 AM
> >> >> Subject: [R-sig-Geo] Problems reading shapefiles in R
> >> >>
> >> >> Dear list members,
> >> >>
> >> >> I am trying to read a shapefile in R using 3 different methods and all 
of
> >> >> them failed:
> >> >>
> >> >>> ai_biotica <- readOGR(dsn="C:/ProyectosRespacial/ICE/SIG_Biotica_PHED",
> >> >> layer="AI_BIOTICA_010411_CRTM05")
> >> >> Error in ogrInfo(dsn = dsn, layer = layer, input_field_name_encoding =
> >> >> input_field_name_encoding) :
> >> >>
> >> >>         GDAL Error 4: Unable to open
> >> >> 
>C:/ProyectosRespacial/ICE/SIG_Biotica_PHED\carretera_interamericana_CRTM05.shx
> >> >> or
> >> >>
> >> > 
>C:/ProyectosRespacial/ICE/SIG_Biotica_PHED\carretera_interamericana_CRTM05.SHX.
> >> >>
> >> >>> nc1 <-
> >> >> 
>readShapePoly("C:/ProyectosRespacial/ICE/Shapefiles/AI_BIOTICA_010411_CRTM05.shp",
>
> >> 
> >> >> ,
> >> >> proj4string=CRS("+proj=tmerc +lon_0=-84 +lat_0=0 +x_0=500000 +k=0.9999
> >> >> +datum=WGS84"))
> >> >> Error in read.dbf(filen1) : unable to open DBF file
> >> >>
> >> >>
> >> >>> ai_biotica <- readShapeSpatial("AI_BIOTICA_010411_CRTM05")
> >> >> Error in read.dbf(filen1) : unable to open DBF file
> >> >>
> >> >> I will appreciate any input on the problem.
> >> >>
> >> >> Best,
> >> >>
> >> >> Manuel Spínola
> >> >>
> >> >>
> >> >>
> >> >> --
> >> >> *Manuel Spínola, Ph.D.*
> >> >> Instituto Internacional en Conservación y Manejo de Vida Silvestre
> >> >> Universidad Nacional
> >> >> Apartado 1350-3000
> >> >> Heredia
> >> >> COSTA RICA
> >> >> mspinola at una.ac.cr
> >> >> mspinola10 at gmail.com
> >> >> Teléfono: (506) 2277-3598
> >> >> Fax: (506) 2237-7036
> >> >> Personal website: Lobito de río 
> > <https://sites.google.com/site/lobitoderio/>
> >> >> Institutional website: ICOMVIS <http://www.icomvis.una.ac.cr/>
> >> >>
> >> >>     [[alternative HTML version deleted]]
> >> >>
> >> >>
> >> >
> >> > _______________________________________________
> >> > R-sig-Geo mailing list
> >> > R-sig-Geo at r-project.org
> >> > https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> >> >
> >> 
> >> -- 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
> > 
> 
> -- 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
>

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