How-To Code Your Own GRASS extension

Want to write your own GRASS code? Read on!

Code examples

For a beginner, the usual approach is to find a similar module and use that as a template.

• Template for raster module: source:grass/trunk/doc/raster/r.example/
  • example for pixel oriented raster module: source:grass/trunk/raster/r.patch
  • example for pixel oriented time series raster module with segmentation: source:grass/trunk/raster/r.series
  • example for full map oriented raster module with segmentation: source:grass/trunk/raster/r.cost
  • example for statistics oriented raster module: source:grass/trunk/raster/r.resamp.stats
• Template for vector module: source:grass/trunk/doc/vector/v.example/
  • example for vector module with database support: source:grass/trunk/vector/v.extract/
  • example for topology oriented vector module: source:grass/trunk/vector/v.edit/
  • Shell script templates: please take a look at existing scripts at source:grass/branches/develbranch_6/scripts/
  • Python script templates: please take a look at existing scripts at source:grass/trunk/scripts/

Of course all existing modules and libraries are examples to look at.

GRASS Programmer's Manual

​GRASS Programmer's Manual

Further notes

• Submitting rules
• See ​https://grasswiki.osgeo.org/wiki/Development (should be moved to this trac wiki)

Good programmer? Yes!

If so (or willing to become a good programmer), please check HowToContribute.