Hi, I wanted to confirm that there is still no straightforward way to pass region.id values to a GWT file when using write.sn2gwt, as this post from two years ago suggests: http://www.mail-archive.com/r-sig-geo at stat.math.ethz.ch/msg02209.html GeoDa needs the particular region.id values to, for example, make histograms from weight files. It seems that these are passed fine for GAL files with write.nb.gal, but not GWT files. Does anyone know of a work-around? Thanks, John
write.sn2gwt and lost region.id
3 messages · Roger Bivand, pota0011 at umn.edu
On Fri, 29 Oct 2009, pota0011 at umn.edu wrote:
Hi, I wanted to confirm that there is still no straightforward way to pass region.id values to a GWT file when using write.sn2gwt, as this post from two years ago suggests: http://www.mail-archive.com/r-sig-geo at stat.math.ethz.ch/msg02209.html GeoDa needs the particular region.id values to, for example, make histograms from weight files. It seems that these are passed fine for GAL files with write.nb.gal, but not GWT files. Does anyone know of a work-around?
I'll try to implement this - which version of GeoDa and/or OpenGeoDa are you using? I think the revision works for classic GeoDa, but OpenGeoDa cannot open GWT files that it itself has created when the IDs are not 1, ..., N. Best wishes, Roger
Thanks, John
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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
I'm mostly working with classic GeoDa. It uses the legacy GWT format when creating/opening GWT files with Rec_Num 1,..N IDs. However, write.sn2gwt always uses the new format with the "shpfile" and "ind" fields, even though it doesn't pass region.ids. So it seems to me that one has to edit the header file to the old format by deleting everything by the number of IDs, before classic GeoDa can read the file. It would be great if write.sn2gwt could either pass the region.ids or alternatively have an option for creating the GWT file in legacy format. At least that's how I'm understanding things; let me know if there is something I'm missing. Thanks, John
On Oct 30 2009, Roger Bivand wrote:
On Fri, 29 Oct 2009, pota0011 at umn.edu wrote:
Hi, I wanted to confirm that there is still no straightforward way to pass region.id values to a GWT file when using write.sn2gwt, as this post from two years ago suggests: http://www.mail-archive.com/r-sig-geo at stat.math.ethz.ch/msg02209.html GeoDa needs the particular region.id values to, for example, make histograms from weight files. It seems that these are passed fine for GAL files with write.nb.gal, but not GWT files. Does anyone know of a work-around?
I'll try to implement this - which version of GeoDa and/or OpenGeoDa are you using? I think the revision works for classic GeoDa, but OpenGeoDa cannot open GWT files that it itself has created when the IDs are not 1, ..., N. Best wishes, Roger
Thanks, John
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