GRASS GIS 8.4.2 Reference Manual: Topic geometry - GRASS GIS Manual
Author: GRASS Development Team

## Topic: geometry

i.image.mosaic | Mosaics several images and extends colormap.
r.patch | Creates a composite raster map layer by using known category values from one (or more) map layer(s) to fill in areas of "no data" in another map layer.
r.thin | Thins non-null cells that denote linear features in a raster map layer.
v.delaunay | Creates a Delaunay triangulation from an input vector map containing points or centroids.
v.drape | Converts 2D vector features to 3D by sampling of elevation raster map.
v.edit | Edits a vector map, allows adding, deleting and modifying selected vector features.
v.extrude | Extrudes flat vector features to 3D vector features with defined height.
v.fill.holes | Fill holes in areas by keeping only outer boundaries
v.hull | Produces a 2D/3D convex hull for a given vector map.
v.in.region | Creates a vector polygon from the current region extent.
v.mkgrid | Creates a vector map of a user-defined grid.
v.overlay | Overlays two vector maps offering clip, intersection, difference, symmetrical difference, union operators.
v.parallel | Creates parallel line to input vector lines.
v.patch | Creates a new vector map by combining other vector maps.
v.perturb | Random location perturbations of vector points.
v.report | Reports geometry statistics for vector maps.
v.segment | Creates points/segments from input vector lines and positions.
v.select | Selects features from vector map (A) by features from other vector map (B).
v.split | Splits vector lines to shorter segments.
v.to.3d | Performs transformation of 2D vector features to 3D.
v.to.lines | Converts vector polygons or points to lines.
v.to.points | Creates points along input lines in new vector map with 2 layers.
v.type | Changes type of vector features.
v.voronoi | Creates a Voronoi diagram constrained to the extents of the current region from an input vector map containing points or centroids.

See also the corresponding keyword geometry for additional references.

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