Talk:GRASS Community Sprint Prague 2012

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Martin Landa

  • OSGeo4W GRASS package configuration: added libLAS support ( - r51677 & r51679
  • various wxGUI fixes
  • implement saving list of executed commands in wxGUI - r51798
  • wxGUI about window issues - r51830
  • wxGUI vector/raster importer: updated list of formats (db/protocol): 'PostGIS WKT Raster driver', 'CouchDB', 'WFS','GeoRSS'

Markus Metz

  • R-tree made n-dimensional (from 3D) for temporal GIS support - esp. r51799

Markus Neteler

  • Fundraising for this Community Sprint (with great help from Arnulf Christl)
  • PSC composition discussion
  • fix r.lake segfault for seed map (r51752) together with Markus Metz
  • backport of wxGUI language selector (.bat file update yet missing for Windows) - together with Luca Delucchi
  • Lidar DEM based example added to r.lake
  • Testing QGIS-Sextante-GRASS integration:

Anna Kratochvilova

  • wxGUI/digitizer: add help button to digitizer toolbar (r51742)
  • wxGUI: fix histogram tool (the one using the d.histogram) (r51753)
  • wxNviz: revert changes in zexag and improve its behaviour for latlon projections (r51695)
  • wxGUI: fixes for d.rast.num and d.rast.arrow

Milena Nowotarska

  • WinGRASS bug hunting
  • translation

Vaclav Petras

Nikos Alexandris

Luca Delucchi

  • create
  • translation status in about gui r51838 r51840 r51844 r51845
  • several improvements in About GUI (translation status, used language, improvement font's styles)
  • Some improvement into not finish yet

Stepan Turek

  • - improved support of WMS 1.3.0 standard and added more examples into manual (r51700)
  • worked on feature for interactive inserting of coordinates into parameter field
  • worked on improvement of mouse events handlers unregistration from map window
  • discussed GSoC project with mentors
  • studied WxGui code
  • thanks to Václav, Anna and Martin for help

Soeren Gebbert

  • Presentation and demonstration of the new temporal GIS framework
  • Implementation of scaled time axis for space time voxel cubes r51779
  • Discussion and specification of the new Python GRASS API with Pietro Zambelli and other GRASS developer
  • Discussion about a better integration of the temporal GIS framework modules in the GRASS GUI with Martin Landa
  • Bug hunting [1], [2] and tests writing for the 3D raster library
  • Discussion and specification of the new GRASS toolbox approach
  • Moved the ilist functions and struct from vector lib to gis lib [[3]

Helena Mitasova

  • discussed adjustments in wxnviz and future work on visual analytics in space-time cube with Anna
  • explored potential for collaborations in FOSS4G education and OSGeo research and edu lab with Martin,
  • clarified some wxgui zoom-region issues with Martin
  • sanbox for NCSU students
  • discussed updates for PSC membership with Markus
  • reviewed the new website status and evaluated possibilities to move forward
  • discussed situation with libLAS and lasTools

Wishes for the Community Sprint

  • Visual Guide to GRASS GIS modules: scratch a collection of per-module dedicated||or tutorial/task oriented, simple, minimalistic yet attractive, bullet-proof visual examples
    • exemplify what GRASS modules do rather than how they do it, thus different than the manuals -- rephrase title?
      • make use of existing grass modules list(s), like (this old) GRASS GIS 6.3 Command list (PDF document)
        HB: A version for GRASS 6.4 is here. How to advertise it better? The script to make it is in SVN, see tools/
      • visuals should clearly refer to both commands (CLI) and (their) respective menu entry (in GUI)
      • ignore modules which cannot be visualised?
    • check if (and some-how) task-oriented visual examples could be build out of per-modules examples
    • setup specific styling rules (?)
      • only one descriptive sentence per module or task
      • visuals clearly refer to both commands (CLI) and (their) respective menu entry (in GUI)
      • limited caption(s) describing visuals
    • end-up with some independent and beautiful TeXy PDF
    • visually enrich existing manuals and/or grass-wiki
    • or consider Sphinx
    • Random examples
      • Important concepts in GRASS-GIS' raster processing workflow
Understanding the concept of computational region -- (1) North Carolina DEM 500m (elev_state_500m), (2) basins derived from the DEM by r.watershed (threshhold=50K), (3) a selected basin within which grass raster modules will operate
      • combination of r.slope.aspect, r.buffer2 (grass70) and r.blend
r.blend -- combined streams, buffered streams and aspect
  • Review of the python + ctypes example scripts.
The examples given in the code for doc/python/, and on the Ctypes wiki page have so far for me all been broken in some way or another. Either grass7 API in grass6 example, typos, incomplete, etc. have made almost all of them fail out of the box. As this is teaching code we should make sure it's perfect :-). See also bug in trac about possible memory leak in r.example.
  • Extend r.colors documentation by an example for a user-generated logarithmic color table.
+ 'r.colors -e' example may be of more interest, even if many people don't know about it.
+ an example of the 'd.legend use=0.001,0.01,0.1,1,10,100' trick with log scale color rules
  • I (Hamish) recently added support for Alessandro Frigeri's Planetary ellipsoid list (trunk/lib/gis/ to the wx location wizard, but it is still buggy, and I think I broke e.g. "airy" too. any python experts able to help? tx.
  • In the wiki, Template:AddonCmd could use an update for GRASS 7 entries. The page layout is a bit different (different pages for different groups), so either a new Template:AddonCmd7 is needed, or a bunch of fancy logic added to e.g. the way than man pages can have their version added as a "|version=" with Template:Cmd.
(ML) This template points to GRASS AddOns page. To implement this wish we would need separate wiki pages, eg. GRASS 6 AddOns and GRASS 7 AddOns. Or the template could also point to the source code - something like [GRASS_Addons#<module>] ([trac/addons/grass<version>/<module> src]).
We also have AddOns/GRASS7, so the structure is totally confused. We need to keep AddOns as landing pages as it has been highly cited
  • Enhance Template:wikipedia so that alternate names can be given (like with Template:Cmd), mainly to avoid having to use "_" for spaces in the presented link-text.

Testing by power users

(Power) users from all over the world are kindly invited to assist with testing of new and existing functionality. To collect results and notes, we set up an interactive, collaborative editing tool which works in real-time:

Please check


Discuss role and current composition of GRASS-PSC

Discussion about GRASS PSC:

  • Every year members are requested to confirm to continue their work in the PSC.
  • After the Community Sprint 2012, the Chair will request updates to the RFC1 from the PSC members.
  • Answer within five business days needed.
  • In case of no continuation/no answer, a member is replaced in order to refresh the PSC.
  • To be eligible for PSC membership, a person should have a demonstrated and substantial involvement in GRASS GIS (operation of the PSC is defined at RFC1).


  • Discuss Google Summer of Code (two students are here)
  • Discuss GRASS 6.4.3 and 7.0 release schedule
  • Define make a manual test procedure for users to simplify testing before new releases, write this up in the wiki (example)


Improve Web site or use CMS


  • Document tips & tricks for GRASS compilation with the wxGUI
there is Compilation on MS-Windows
  • Discuss new GRASS Book 4th edition in conjunction with the GRASS GIS 7.0 release in early 2013




  • continue the Android compilation (needs especially the elimination of XDR in rast and rast3d)

QGIS-Sextante-GRASS interface

Update the GDAL-GRASS interface to GRASS 7

Rules Based programming and Agent Based Modelling

  • Tutorial/Documentation on g.infer
  • r.agent in GRASS 7

Time series

Automated command use statistics

  • modify g.parser to write out the list of used commands (without parameters) into a text file for simple, automated command use statistics
HB: I've already written a script to do this. (a while ago, I'll have to dig it out)

Mobile: inventory of mobile and touch implementations

Cloud computing

  • cluster usage best practices

GSoC 2012

  •* front end, WMS
  • Python API
  • Image Segmentation


Model integration

GRASS modules fixes

Signal handling

  • The Python based scripts should catch CTRL-C to avoid that clutter is left behind & that ugly traceback messages are printed to the terminal.

Suggestion by Anne Ghisla (yet not working... ):

Index: lib/init/
--- lib/init/   (revision 51604)
+++ lib/init/   (working copy)
@@ -30,7 +30,12 @@
 import subprocess
 import re
 import platform
+import signal
+# catch user-sent CTRL-C
+signal.signal(signal.SIGINT, lambda a,b:cleanup())
+signal.siginterrupt(signal.SIGINT, False)
 # Variables substituted during build process
 if os.environ.has_key('GISBASE'):
     gisbase = os.environ['GISBASE']

  • Currently if vector creation modules fail to create/import they still leave behind the empty skeleton of a map, so you need to use --o for the next time. It would be nice if cleanup could occur. This doesn't happen (visibly) with raster maps as they are composed in $MAPSET/.tmp/ and only moved into the main $MAPSET elements once everything is finished. Vector maps on the otherhand write to the MAPSET in-place.

Fix wxGUI problems

Add a "change language" option in GRASS GUI

Implement the diff provided here:

Fix several issues

A. Clerici: please fix:

  • ticket
  • ( Anna Kratochvilova) - r51824, r51825, r51827. ticket
  • wxGUI bugs (GRASS6.4.2RC3 under Fedora 16):
    • ( Anna Kratochvilova) - r51753, r51772, r51773. In the 'Create histogram of raster map' function, the style pie and the Color for text and axes options are not working. The options run fine on the tcltk GUI and in command line mode.
    • In the 'Add scalebar and north arrow', the scale can be modified only once and the option can't be re-entered nor the scale can't be deleted. Also in this case there are no problems with the tcltk GUI.
    • ( Anna Kratochvilova) - r51824, r51825, r51827. The option 'Add raster cell arrows' seems not to work properly. It seems that the arrows in the Map Display cannot zoomed in. It can be checked by the following steps:
      • Load and display the aspect (Spearfish) map; Open the d.rast.arrows panel through the GUI button and choose the same map aspect. Click Apply: the Map Display appears green as expected for the very high resolution; Choose 10 for the 'Draw arrow every Nth grid cell:' option and none as 'Color for drawing grid or “none”' option. The arrows are displayed on the cells of aspect map; To make the arrows visible choose slope as 'Raster map containing values used for arrow length:' and 10.0 as 'Scale factor for arrows'. Zoom in a very small area: the cells of aspect map are enlarged, but the density of arrows remains the same; The direction is correctly the same for all arrows inside the same cell but it seems that instead of having an arrow each 10 aspect cells, there is an arrow each 10 pixel of the screen (with tcltk GUI the procedure works fine)
  • Improve the GRASS 7 wx0..6 monitors
    • Some improvements done by Vaclav Petras


Optionally, have all-in-one GUI window (requested by many new users!):

Current wxGUI layout with detached window components
Proposal for wxGUI layout modification (Recomposition of existing toolbars, mapview and menus by simple rearrangement into one frame)

Proposed solution: wxLayoutAlgorithm(), see WxGUI#What_others_do

Optionally, a minimalistic cointegration of a map display and the command console. See also this post in grass-user Re: [GRASS-user] replacement for d.mon in GRASS 7.0?

alt text

work on for GRASS7

Saving History

  • when using the wxGUI, it needs to write back to the shell history
`cat wxgui_history.log >> $MAPSET/.bash_history`
Since the wxGUI shell quoting is not perfect, maybe it is better not to write directly to real shell history, but maintain its own in ~/.grass7/history.

Digitizing toolbar

  • missing string "Select vector map" from the drop-down widget on digitizing toolbar
on winGRASS, nightly build of 24th May
  • after editing vector objects and saving, the changes are not applied on the map. Must be some refresh problem.
  • Highlighting problem
objects selected in the attribute table are not highlighted on the map
objects selected ton the map are not highlighted in the attribute table.
  • Bounding box of a layer broken after deletion of some objects with broken geometry, also displaying of the attribute table broken with a message that the map layer is not a vector one,
closing the layer from the layer tree also not possible
after closing GRASS6.4.3 and reopening the project, the layer is restored with all the changes applayed.

Attribute manager

  • Editing attribute table broken
cannot delete a row, permission denied
different than selected row dissapears after not succesful row deletion but is back after refreshing the table.
  • Not able to insert a value into a table, permision to the temp file denied.
  • Too small area for displaying the table data after connecting a table to the vector map.
Add a table to the vector layer in wxGUI GRASS6.4.3 with: Show attribute table > Manage layers tab.
Go to Browse data tab, the area to thisplay the attributes is extreemly small and cannot be stretched.
After closing the table manager and reopening, the area is normal wide again.
  • SQL simple select "explodes" if selecting a string attribute without quotes

Map Display


  • Solve module description string duplication in both grassmods.po and grasswxpy.po files.
    • Before fixing this problem in code, please find a way to automagically copy the translated strings to the proper .po files for all the languages.
    • The problem is that the wxGUI menustrings are copied into grasswxpy_XX.po while the strings are already translated in
  • Add current "language" output into "about" panel
  • Add new tab about "languages statistics" into "about" panel
  • Improvment "about" panel style

Project file

  • Find a way to successfully open a project file made in GRASS6.4 in GRASS7.
Due to changes (e.g. removal of some flags, e.g. -o flag of d.rast), the project file is not opened in a correct way. The user can see the layers in the layer tree, but they cannot be displayed in the map canvas. A warning would help.
  • add version into file tags

Python coding hints

Notes for the organizers

See Talk:GRASS_Community_Sprint_Prague_2011#Notes_for_the_organizers

Not to forget about the next time

First day:

  • presentation of participants

First or second day:

  • group photo