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

[Roger Bivand]

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)?

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