[GRASS-dev] GSoC - TGRASS temporal algebra status

Hamish hamish_b at yahoo.com
Thu Jun 13 02:29:53 PDT 2013

Thomas wrote:
> in the last weeks Soeren and I worked intensively on the 
> concept for the temporal algebra in GRASS. I created a wiki
> page with an overview of our concept open for discussion:
> http://trac.osgeo.org/grass/wiki/Grass7/TemporalGISAlgebra

Hi Thomas, I'm (really) glad to see that you will hit the
ground running. :)

> Additionally I uploaded a first version of the new created
> module v.mapcalc to my GSoC project page at code.google:
> https://code.google.com/p/grass-gis-temporal-algebra/

I would ask that you develop your code in either the grass-addons
or grass-sandbox svn repo, so that when it comes time to merge
your finished product(s) it can be done with full changelog
history, and that we may provide peer support as we see the
commits pass by in the regular way.

for the wiki I don't really mind where it lives, as long as
it's stable and so will still exist years from now for reference.

> This module provides an algebra for overlay and buffer
> functions on vector map layers based on PLY (Python Lex-Yacc)
> and PyGRASS.
> In the next step, we will develop the temporal algebra and
> combine the vector algebra with it to derive the temporal
> vector algebra module t.vect.mapcalc.

seeing that it seems to share much with r.mapcalc, it would
be good to document on the wiki/help pages where its syntax
diverges from r.mapcalc, and document in the code which design
decisions were inherited directly from r.mapcalc.

thanks and have fun,

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