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Project report "Busboîtescartesmaps"
2009-10-25 17:49:23 - by Nicolas Malevé

More than time for a project report on Busboîtescartesmaps project that took place last November.

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The project proposed to the participants to drift within Brussels using the post boxes as elements to create their itinerary. The walks were conducted by several guides (Peter Westenberg, Christina Clar and Natasha Roublov, Lottie Child) who imagined different experiments to understand space and urbanism differently.

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Walking blindfolded
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Ears enhancement

This project was the occasion to make a first software prototype, using the Tresor’s toolbox, to record the meanderings of people in the city.

Here follows a series of notes explaining the first steps of the project.

The scenario goes like this. We select a series of spots in Brussels. These spots correspond to the postboxes spread in the center of the city. Their locations cover a wide range of places and environments, you can find them near schools, streets with heavy traffic, dead end streets, parks, etc.

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Postboxes as anchors for a walk

A group of people go in the city with an audio recorder and a GPS and visit the spots. The clocks of the GPS and the recorders are synchronised. The GPS records all the time the tracklogs of the people and the audio device capture the sound for the whole duration of the walk. When they come back after the walk, the GPS data and the audio data are copied on a computer. By comparing the time code of the GPS track and the start time of the audio track, we can extract audio segments based on location. we can extract the audio recorded by the walkers when they were nearby the spots.

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The software captures the audio fragments recorded near the postboxes

These audio segments can then be placed on a digital map where the visitors can listen to them. The interface allow them listen to the chaos of all the sounds they have recorded near the spots or to select the sounds one by one, turn them on and off.

Samples:
Some walks have concentrated on the atmospheric sound, recording the ambient atmosphere( ie. pool_atmosphere_long.ogg), or interacting with it (scratching the surface with shoes ie. scratching_the_ground.ogg).
Other guides gave instructions like describing aloud what one was seeing (STE-003-workingcopy_00m_43s_40h__01m_25s_90h.mp3, STE-003-workingcopy_35m_43s__38m_59s_40h.mp3, STE-003-workingcopy_09m_01s_80h__10m_37s_60h.mp3, STE-003-workingcopy_51m_30s__55m_28s_60h.mp3,STE-003-workingcopy_15m_55s_50h__19m_37s.mp3,STE-003-workingcopy_23m_17s_40h__27m_52s_90h.mp3)
Etc etc.

Interface:

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The spots are displayed and all sounds played

By default, the software lets you listen to the ’mumbling’(all_walk-5.ogg,all_walk-0.ogg) of the whole last walk, or to select individual takes within this.

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The user can filter the sounds and select the walks

Using the menu, you can chose a walk or chose a date or a guide.

Software in use:
openstreetmap, setting the coordinates
gpsbabel, can extract data from a gps unit. can also select data by region and time
sox, given a start time, it can cut audio fragments for a certain duration
mp3splt, cuts an mp3 file in segments
gstreamer allows for playing audio files concurrently
perl, php and java to glue the elements.

The software prototype has been developed by Ivan Monroy Lopez and Nicolas Maleve. The pre-alpha soon available for download.

Où ? Ici, avec OSM !
2008-10-30 16:32:28 - by Pierre Huyghebaert

Pour répondre à une question récente (« Où se passera la semaine de workshop Busboitescartesmaps ? À Recyclart. ») d’une manière plus cartographique, utilisons Openstreemap dont la qualité ne cesse de progresser !

En utilisant le rendu Mapnik (proposé par défaut) :


View Larger Map

En utilisant le rendu OSmarender (proposé en alternative) :


View Larger Map

Et pour pousser plus loin la découverte de la modification de rendu à partir d’une base de donnée GIS : http://tile.openstreetmap.nl/ panman/styledit/

Bruxelles Social
2008-08-18 13:01:00 - by Pierre Huyghebaert

Le site Bruxelles Social offre la visualisation sur cartes de nombre d’acteurs sociaux à Bruxelles, avec une base de données très riche allant des structures d’hébergement jusqu’au agences de logements par exemple. Basé sur Urbis et développé par le CIRB, la navigation requiert -pour l’instant- l’utilisation de trois fenêtres : requête, carte et fiche détaillée.

software commit visualisations
2008-07-22 11:02:46 - by Nicolas Malevé


Codeswarm by Michael Ogawa.

«This visualization, called code_swarm, shows the history of commits in a software project. A commit happens when a developer makes changes to the code or documents and transfers them into the central project repository. Both developers and files are represented as moving elements. When a developer commits a file, it lights up and flies towards that developer. Files are colored according to their purpose, such as whether they are source code or a document. If files or developers have not been active for a while, they will fade away. A histogram at the bottom keeps a reminder of what has come before.»

http://vis.cs.ucdavis.edu/ ogawa/codeswarm/

The code:
http://code.google.com/p/codeswarm/
http://code.google.com/p/codeswarm/wiki/GeneratingAVideo

It is worth looking also to the VIDI group of which Ogawa is a member.
http://vidi.cs.ucdavis.edu/publications
http://vis.cs.ucdavis.edu/...treemaplayout-final.pdf

Thanks Wendy for the info.

Desktop GIS for Linux, a series
2008-01-28 21:36:32 - by Nicolas Malevé

The Linux Journal is publishing the first issue of a series about Linux and GIS desktop publishing.

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The Udig software

Thanks, Eric!

Statistiques qui poussent depuis les profondeurs enfuies des bases de données souterraines
2007-09-25 23:26:46 - by Pierre Huyghebaert

Hans Rosling, expert suédois en statistique et médecine, est le promoteur très efficace de Gapminder, une intéressante interface de production de statistiques animées, récement rachetée par Google... Son graphisme assez rudimentaire rends peu justice à la finesse de ses critères et à la justesse de ses choix, mais c’est accessoire. Après avoir essayé le système, il faut voir Monsieur Rosling commenter live avec exhaltation les chiffres évoluants simultanément année par année aux très branchées conférences Ted de Monterey (BMW-powered). Et voir comment en 2006 puis en 2007 il insiste avec une vigueur communicative et visuelle sur les articulations sensibles des données qu’il manipule est plutôt ravigorant ! Irrésistible et bien sur culte.

"Nocturne, of Chopin, so beautiful music. But few people will appreciate the music if I just show them the notes. Most of us need to listen to the music to understand how beautiful it is. But often that’s how we present statistics ; we just show the notes we don’t play the music."

2006 :

2007 :