[GRASS-user] New modules in svn add-on: r.area and r.convergence

[Jarosław Jasiewicz]

Hi

I added new two modules to svn add-on.

r.area

Simple module available in almost every raster processing GIS 
application. Calculates area size of clumped areas and ascribe these 
values to these areas. Also allow remove small areas with size lower 
than treshold. All that functionality can be attempted with  few 
existing grass commands (r.to.vect, v.db.addcolumn, v.to.db v.to.rast, 
r.mapcalc sequentially) but I spend less time programing this module 
than performing this set of operation (on rather huge map with over 
100000 cluped areas)

r.convergence

specializing module reworked from SAGA. Calculate convergnece index for 
given area based on DEM. Good wor detecting geomorphological lineaments. 
It use different method for slope-aspect calculation than SAGA (but the 
same as in GRASS r.slope.aspect), also can work in lat-long projections.

As always any comments, tests, suggestions and critics are welcome

Jarek