GRASS Vector Attributes

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Q: How to edit GRASS Attributes?

A: Some commands allow specification of attributes, shown as: attr=string|cat|double|coords|dim

The meanings of these terms:

  • string: text label attribute
  • cat: vector ID number (cat: category, saved in both geometry file as well as attribute table)
  • integer: integer precision attribute
  • double: double precision attribute
  • ...
  • coords: vertex coordinates
  • dim: number of dimensions (2D, 3D etc)

Modification of attributes

Special cases

Two categories (with slash in the middle) can be assigned to a single vector feature in a single layer. This can happen e.g. when importing overlapping polygons:

91/230
73/99
196

See also