warning at creating SpatialPolygonsDataFrame and error at saving through rgdal
On Mon, 29 Nov 2010, Agustin Lobo wrote:
Hi! I create a SPDF with a function HypNAr = meta2sppol() that ends up with: sitios <- 1:length(noms) row.names(datos) <- sitios SpatialPolygonsDataFrame(dummy, data=datos, match.ID = T) but get: Warning message: In data.row.names(row.names, rowsi, i) : some row.names duplicated: 2 --> row.names NOT used
The message is coming from data.frame() in base package. Do debug(meta2sppol) debug(data.frame) HypNAr = meta2sppol() and see what happens inside the data.frame() call that creates datos, which is where the warning is issued (it may be inside a coercion method call, such as as.data.frame()); open: https://svn.r-project.org/R/trunk/src/library/base/R/dataframe.R and search for "some row.names duplicated". That is, the problem is in your own function. Please also note that providing a reproducible example is crucial to getting precise assistance, and usually the exercise of writing such an example reveals the cause, thus solving the problem more quickly. Roger
I do not understand, as I define the row names as a sequence of integers, how can they be duplicated? I can plot the SPDF and the data slot is correct, but when I try to save as shapefile:
writeOGR(HypNAr,dsn="HypNAr",layer="HypNAr",driver="ESRI Shapefile",verbose=T)
Error in writeOGR(HypNAr, dsn = "HypNAr", layer = "HypNAr", driver = "ESRI Shapefile", : GDAL Error 1: Invalid index : -1 Calls: writeOGR -> .Call In addition: There were 11 warnings (use warnings() to see them) Is this error related to the previous warning? Thanks! Agus
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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