[R-sig-Geo] Sleuthing X windows bug in Ubuntu Gutsy

[Tim Keitt]

On Sat, Mar 29, 2008 at 10:01 AM, Tim Keitt <tkeitt at gmail.com> wrote:
>
> On Sat, Mar 29, 2008 at 8:41 AM, Roger Bivand <Roger.Bivand at nhh.no> wrote:
>  > On Fri, 28 Mar 2008, Tim Keitt wrote:
>  >
>  >  > I'm trying to see if I can track down a bug in X windows that causes
>  >  > it to crash when plotting (I believe) very small filled polygons (or
>  >  > it may have to do with large numbers of polygons). I first noticed
>  >  > this running QGIS. Loading a PostGIS layer with ~3K polygons will
>  >  > cause X to abort. I can load the layer if I have already zoomed into a
>  >  > smaller region of the coverage. Once I try to zoom out to the full
>  >  > extent, X dies.
>  >  >
>  >  > So I tried loading the polygons into "sp" using "readOGR" which works
>  >  > great. I could then plot the polygons, no problem. But when I called
>  >  > "spplot" which I believe fills the polygons, same problem. X crashes.
>  >  >
>  >  > Can anyone confirm this behavior? Try plotting a large number of
>  >  > polygons with spplot and also try very small polygons (less than a
>  >  > pixel size). I can send around the shapefile if anyone is interested.
>  >  > It contains GSHHS coastlines for Micronesia.
>  >
>  >  I can't reproduce any problems on
>  >
>  >  http://www.census.gov/geo/cob/bdy/co/co00shp/co99_d00_shp.zip
>  >
>  >  library(rgdal)
>  >  usc <- readOGR(".", "co99_d00")
>  >  # OGR data source with driver: ESRI Shapefile
>  >  # Source: ".", layer: "co99_d00"
>  >  # with  3489  rows and  9  columns
>  >  plot(usc, col=rainbow(52)[usc$state1])
>  >  spplot(usc, "STATE", col.regions=rainbow(52))
>  >
>  >  and:
>  >
>  >  $ xdpyinfo
>  >  name of display:    :0.0
>  >  version number:    11.0
>  >  vendor string:    The X.Org Foundation
>  >  vendor release number:    60802000
>  >  X.Org version: 6.8.2
>  >  ...
>  >  screen #0:
>  >    dimensions:    1280x1024 pixels (361x271 millimeters)
>  >    resolution:    90x96 dots per inch
>  >    depths (7):    16, 1, 4, 8, 15, 24, 32
>  >
>  >  Could you please make your file available - maybe there is something
>  >  particular about it? Is there way of asking X which driver it is using
>  >  (here nvidia proprietary for Legacy GPU version (1.0-71xx series), full
>  >  details in /proc/driver/nvidia)?
>
>  I'll put the file someplace where it can be downloaded.

OK. It is at http://www.keittlab.org/~tkeitt/melanesia.tgz. I just
confirmed loading this file into QGIS 0.9.2-rc2 reproduces the X
crash. I'll test the same under Hardy shortly (requires a chroot).

THK

>
>  This has happened on my desktop using both nvidia and vesa drivers and
>  on my laptop with the intel driver.
>
>  THK
>
>
>  >
>  >  Roger
>  >
>  >  >
>  >  > THK
>  >  >
>  >  >
>  >
>  >  --
>  >  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
>  >
>  >
>
>
>
>
>
> --
>  Timothy H. Keitt, Assistant Professor
>  University of Texas at Austin http://www.keittlab.org/
>  Contact info and schedule at http://www.keittlab.org/~tkeitt/
>  Please support open document formats http://opendocument.xml.org/
>



-- 
Timothy H. Keitt, Assistant Professor
University of Texas at Austin http://www.keittlab.org/
Contact info and schedule at http://www.keittlab.org/~tkeitt/
Please support open document formats http://opendocument.xml.org/