wiki:Grass7/VectorLib

Version 50 (modified by martinl, 15 years ago) ( diff )

v.segment

Vector library in GRASS 7

Table of Contents

  1. File-based spatial index
  2. OGR interface
    1. Direct OGR read access
    2. Direct OGR write access
  3. Redesign support structures
  4. 3D vector data support

See:

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):

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. E.g. 

# 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

Redesign support structures

Reduce memory requirements particularly for points and lines. See ticket:542.

TODO

3D vector data support

TODO

See also:

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