The GRASS 6/7 vector format is very similar to the previous GRASS 4.x (5.0/5.3) vector format. … See more

GRASS vector maps are stored in an arc-node representation, consisting of curves called arcs. An arc is stored as a series of x,y,z coordinate pairs. Two consecutive x,y,z pairs … See more

There are two levels of read access to the vector data: 1. Level Oneprovides simple access to the vector feature information. There is no access to topology information at this level… See more

Note: "layer" was called "field" in earlier version. In GRASS, a "category" or "category number" is a vector feature ID used to link geometry to attributes which are stored i… See more

For a user-centric view about attribute management, see the explanations in the GRASS GIS Wiki. The attribute data are stored in external database. Connection with the dat… See more

Feature types
Feature types are defined in include/vect_dig_defines.h, see the list below: 1. GV_POINT 2. GV_LINE 3. GV_BOUN… See more