---
name: "topic_geometry"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/topic_geometry"
---

# topic\_geometry(1grass)

## 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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