[GRASS-user] "Select shapes from image"[->Gimp]/tracing in GRASS ?

peter.loewe at gmx.de peter.loewe at gmx.de
Fri Jul 3 06:55:02 EDT 2009


can the following "semi-interactive edge tracing on raster" task be realized using the current GRASS modules ?

* Data: A raster map (think: Landsat RGB, Corinne landcover or alike)
* Input: The user provides two points, both being located on/near a border between two areas in the raster map (entered via the GUI).
* Task: "Some combination of GRASS modules" derives a shortest path (a subset of pixels, not a vector) between the two given points which is plotted along the contrast changes of the raster data.
In Gimp, a similar functionality goes by the name "Select shapes from image".

Can we do such a task with GRASS ?


Dr. Peter Löwe
<peter.loewe at gmx.de>

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