OGR interface in GRASS 7

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:

Scenario 1

Use parameters output for output OGR datasource and olayer for OGR layer. 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

Scenario 2

Use v.external.out

Tasks

• Attribute table (write) access for OGR-linked vectors (direct or linked by v.external)

Changes in vector library

• write_ogr.c​

Changes in modules

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

• v.edit