[GRASS-user] v.external and region bounding box

[Jón Eiríksson]

 Don't know if this helps, but for GSHHS world map

I have used (in 6.4.2)

ogr2ogr -clipsrc xmin ymin xmax ymax GSH_f_L1_clipped.shp GSH_f_L1

to clip before importing, then

v.in.ogr dsn=GSH_f_L1_clipped out=GSH_f_L1_clipped

Jon

 
Þann fimmtudagur 18 Október 2012 10:10 GMT, skrifaði Pietro <peter.zamb at gmail.com>: 
 
> Hi all,
> 
> I have imported the Openstreetmap data of Italy[0] into a
> Postgis/Postgres, using imposm[1].
> Below are reported the table size in postgis:
> 
>          Name         | Type  | Owner |  Size   |
>  ---------------------+-------+-------+---------|
>  osm_buildings        | table | osm   | 805 MB  |
>  osm_landusages       | table | osm   | 202 MB  |
>  osm_mainroads        | table | osm   | 105 MB  |
>  osm_minorroads       | table | osm   | 447 MB  |
>  osm_motorways        | table | osm   |  12 MB  |
>  osm_railways         | table | osm   |  12 MB  |
> 
> I'm using GRASS7. I connected this layers using:
> 
> v.external dsn="PG:dbname=osm" layer=osm_*
> 
> Even if my region is pretty small, around 9km x 14km, GRASS it's very
> slow to load and show the data into the MapDisplay, It seem like all
> the vector features are loaded without take into account the region.
> 
> If I open the same layers with QGIS, with almost the same region
> dimension it's very fast to load/show the data, probably QGIS load
> only the features that are in the bounding box.
> 
> How can I say to v.external to load only the geometry features that
> are in the region boundingbox?
> 
> Should I do this manually, making new tables?
> 
> Pietro
> 
> 
> ps: v.external return a Segmentation fault when I try to build the
> pseudo-topology for the osm_buildings:
> 
> GRASS 7.0.svn (UTM32_WGS84):~ > v.external dsn="PG:dbname=osm"
> layer=osm_buildings --overwrite
> WARNING: Vector map <osm_buildings> already exists and will be overwritten
> Building topology for vector map <osm_buildings at dtm_lidar>...
> Using external data format 'PostgreSQL' (feature type 'geometry')
> Building pseudo-topology over simple features...
> Registering primitives...
> Segmentation fault
> 
> [0] http://download.geofabrik.de/openstreetmap/europe/italy.osm.pbf  ~530 Mb
> [1] http://imposm.org/docs/imposm/latest/
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