wiki:Grass7/VectorLib

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Version 57 (modified by martinl, 15 years ago) ( diff )
cosmetics

Vector library in GRASS 7

See:

source:grass/trunk/doc/vector/TODO

File-based spatial index

Done in r38385 and r39148

OGR interface

Direct OGR read access

Capability to read OGR layers directly without linking them via v.external. Example:

v.info map=~/shapefiles/@OGR layer=busstopsall
v.extract input=PG:dbname=nc_spm_08@OGR layer=busstopsall where="STREET_1 = 'William Moore Dr.'" output=b1

List of modules which supports direct OGR read access ((*) indicates work in progress):

v.info (r39161), v.db.connect (r39538), v.extract (r39621), v.db.select (r39556), v.buffer (r39809), v.category (r39812), v.class (r39813), v.clean (r39814), v.delaunay (r39821), v.dissolve (r39822), v.distance (r39823), v.drape (r39826), v.extrude (r39827), v.generalize (r39828), v.hull (r39829), v.kcv (r39832), v.neighbors (r39834), v.normal (r39839), v.out.ascii (r39881), v.out.dxf (r39882), v.out.ogr (r39883), v.out.pov (r39884), v.out.svg (r39885), v.overlay (r39895), v.parallel (r39896), v.pertrub (r39897), v.qcount (r39898), v.report (r39905), v.sample (r39906), v.segment (r39907), v.reclass (r39908), v.random (r39909), v.rast.stats (r39910), v.select, v.split, v.surf.idw, v.surf.rst, v.to.3d, v.to.db, v.to.points, v.to.rast, v.to.rast3, v.transform, v.type, v.univar, v.what (r40188)

Direct OGR write access

Capability to write OGR layers directly without need to store data in the native vector format and then exporting data using v.out.ogr. Example:

# input: GRASS data
# output: PostGIS database
v.extract map=obce where="NAZEV = Solany" output=PG:dbname=gisdb@OGR olayer=obce

# input: PostGIS layer, ESRI Shapefile
# output: PostGIS database
v.select ainput=PG:dbname=gisdb@OGR alayer=zeleznice \
 binput=shps@OGR blayer=obce operator=intersects \
 output=PG:dbname=gisdb@OGR olayer=obce_zelez

List of modules which supports direct OGR write access ((*) indicates work in progress):

v.edit

Redesign support structures

Reduce memory requirements particularly for points and lines. See #542.

TODO

3D vector data support