[GRASS-dev] GSoC - TGRASS temporal algebra status

GRASS GIS GRASS GIS developer
1

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. :slight_smile:

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,
Hamish

2

Hi Hamish,

···

2013/6/13 Hamish <hamish_b@yahoo.com>

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. :slight_smile:

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.

It is easier for us to use code.google.com at this stage of development. It is much faster than the grass svn especially the web-front-end. We can accidentally smash it without harming the grass7/addons repository. Code reviews can be requested and so on.

When the code is ready to be merged into grass7 (addons or trunk we are not sure about that) the revision control history will be transferred as well, since we are using subversion. As a side effect Thomas get familiar with subversion and is able to use the grass7 repository in the future as well.

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.

IMHO the discussion about grass7 development belongs into the trac wiki, especially the development of specific parts of the GRASS GIS temporal framework. Hence we have chosen the trac wiki. :slight_smile:

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.

We oriented the syntax of the temporal algebra on the syntax of r.mapcalc, and so the syntax of the temporal vector and raster algebra. The wiki page gives and impression what ideas are inherited from r.mapcalc.
Thomas will document this in detail when he implements the temporal algebra.

Best regards
Soeren

thanks and have fun,
Hamish

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