On Mon, 2008-10-13 at 17:07 -0700, Hamish wrote: > Nikos Alexandris wrote: > > Dear All, apologies for the cross-posting but I have trouble to work > > with a BIG shapefil (~160MB). I already used that shapefile in the past > > without problems. But now I can't use it. > > ? what changed? did you install a new version of GDAL/OGR? > I use 400mb shapefiles without problem.. > > > > In GRASS: I (almost) managed to import in GRASS this BIG shapefile but > > the process *stucks* somewhere at "breaking intersections" point (...it > > was running for 10 hours). I broke the process and the file was in > > GRASS' database. I run v.build but it still is problematic. I can't get > > anything on-display. > > It just takes a long time when lines are very long and unbroken. It > eventually gets there. > > See Radim's vector TODO: > http://trac.osgeo.org/grass/browser/grass/trunk/doc/vector/TODO#L242 > > and search the archives for the "Florida Coastline" problem. > > > the v.in.ogr spatial= option might help. > > > > In QGIS: when I try to load directly the shapefile (not the GRASS > > vector) my system freezes!! I haven't seen my linuxbox frozen since I > > don't remember when. What could cause such behaviour? > > Is there anyway to get the shapefile fixed out of GRASS? > > once loaded into GRASS you can run the v.split command to split the long > lines, then it is much faster (at least for other grass commands). > > > Hamish
Hamish and all, back to this "old" post. ******** Attemp 1 ******** # using gdal 1.5.3, grass6_devel # import shapefile v.in.ogr dsn=... out=... # buffer overflow error (or segfault --- I can't recall). ******** Attemp 2 ******** # using gdal-1.6.0beta2, grass6_devel # importing the usual way v.in.ogr dsn=coastlines.shp out=coastlines_longtime -ew --o Projection of input dataset and current location appear to match Layer: coastlines WARNING: Column name changed: 'AREA' -> 'area' WARNING: Column name changed: 'PERIMETER' -> 'perimeter' [...] Importing map 181148 features... ----------------------------------------------------- Building topology for vector map <global_coastlines_longtime>... Registering primitives... 181386 primitives registered 9764427 vertices registered Building areas... 100% 181386 areas built 181386 isles built Attaching islands... 100% Attaching centroids... 100% Number of nodes: 181386 Number of primitives: 181386 Number of points: 0 Number of lines: 0 Number of boundaries: 181386 Number of centroids: 0 Number of areas: 181386 Number of isles: 181386 Number of areas without centroid: 181386 ----------------------------------------------------- WARNING: Cleaning polygons, result is not guaranteed! 100% Building topology for vector map <global_coastlines_longtime>... Number of nodes: 181386 Number of primitives: 181386 Number of points: 0 Number of lines: 0 Number of boundaries: 181386 Number of centroids: 0 Number of areas: - Number of isles: - ----------------------------------------------------- Break polygons: ^[^[----------------------------------------------------- Remove duplicates: ----------------------------------------------------- Break boundaries: # file get's imported and, as it can be seen from the output "breaking polygons" and "removing duplicates" is successful # the "^[^[" characters was me pressing something to check whether the system is still running or not # breaking boundaries is still there even after more than 30 hours! ******** Attemp 3 ******** # v.in.ogr -c ## takes some time but is successful # v.split (vertices=3) ## I have really no idea which number is appropriated depending on what. ### it works # v.clean tool=break ## never ends or it might need more than 2-3 days!? I can open the file with QGIS preview (unstable) but not with QGIS 0.11.0. The latter freezes the whole system, as I have reported in my first post about this. Regards, Nikos _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
