[GRASS-dev] Improving of GRASS GIS Errata proposal

Hello all devs,
following recent movement into providing a greater transparency on
GRASS GIS analysis trustworthiness, I have created a first draft of
GRASS GIS errata framework proposal.
https://trac.osgeo.org/grass/wiki/RFC/5_Errata

Everyone is invited to improve it and provide feedback to prepare
final proposal.

At the moment there are two recent cases of GRASS GIS modules
providing reasonably looking but incorrect analysis results. They both
can be used as use-cases while evaluating need of such framework and
its content:
https://trac.osgeo.org/grass/ticket/2917
https://trac.osgeo.org/grass/ticket/2969

WBR,
Māris.

On Sat, Mar 26, 2016 at 7:25 AM, Maris Nartiss <maris.gis@gmail.com> wrote:

Hello all devs,
following recent movement into providing a greater transparency on
GRASS GIS analysis trustworthiness, I have created a first draft of
GRASS GIS errata framework proposal.
https://trac.osgeo.org/grass/wiki/RFC/5_Errata

Everyone is invited to improve it and provide feedback to prepare
final proposal.

At the moment there are two recent cases of GRASS GIS modules
providing reasonably looking but incorrect analysis results. They both
can be used as use-cases while evaluating need of such framework and
its content:
https://trac.osgeo.org/grass/ticket/2917
https://trac.osgeo.org/grass/ticket/2969

I believe there is a third candidate:
https://trac.osgeo.org/grass/ticket/2820

v.surf.idw had 2 problems:

from the ticket:

Ok, found part of the problem: distance was always left as dy*dy +
dx*dx without ever taking the square root. This obviously changes the
weights as 1/10 is closer to 1/100 than 1/100 is to 1/10000...

The second is more difficult to describe, both fixed in r67211

Using the -n flag gave correct results, otherwise the results were
always wrong. The bug is present in GRASS 7.0.0 to 7.0.2.

Anna

WBR,
Māris.
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Hi Māris, devs,

(sorry for the delay on this)

On Sat, Mar 26, 2016 at 12:25 PM, Maris Nartiss <maris.gis@gmail.com> wrote:

Hello all devs,
following recent movement into providing a greater transparency on
GRASS GIS analysis trustworthiness, I have created a first draft of
GRASS GIS errata framework proposal.
https://trac.osgeo.org/grass/wiki/RFC/5_Errata

This is a great draft!

Everyone is invited to improve it and provide feedback to prepare
final proposal.

At a first glance I have no substantial suggestions at all.
Other devs, please check the RFC5 proposal.

At the moment there are two recent cases of GRASS GIS modules
providing reasonably looking but incorrect analysis results. They both
can be used as use-cases while evaluating need of such framework and
its content:
https://trac.osgeo.org/grass/ticket/2917
https://trac.osgeo.org/grass/ticket/2969

agreed, along with the v.surf.idw mentioned by Anna:
https://trac.osgeo.org/grass/ticket/2820

Others?

Best,
Markus