#qgis

magOSM - Un service d’accès aux données vectorielles #OpenStreetMap

▻https://magosm.magellium.com/index.html

magOSM propose d’accéder à des jeux de données thématiques issus d’OpenStreetMap aux formats #WFS/#WMS. Ces données sont mises à jour quotidiennement sur la France métropolitaine. Ce service permet ainsi d’accéder directement à des couches de données vectorielles sous #QGIS ou tout autre environnement client de services OGC

#osm

Qgis2threejs plugin documentation
▻https://qgis2threejs.readthedocs.io/en/docs

Qgis2threejs plugin is a QGIS plugin, which visualizes DEM data and vector data in 3D on web browsers.

▻http://alasdairrae.github.io/madeira3d2/madeira3d2.html

https://pbs.twimg.com/media/Drv4dzfXgAASTL7.jpg:large

#qgis #three.js #carto #3D

[QGIS] czml_generator plugin | Màtyàs Gede

Il est désormais possible de représenter des relations origine-destination à l’aide de jolies lignes courbes et n 3D. L
e plugin czml_generator développé par Màtyàs Gede (alias Samanbey) permettant de générer des représentations en 3D contient en effet aussi une section sur les liens.

https://pic.infini.fr/I9tdnoak/3rEPDKdg.jpg

En savoir plus : ▻http://samanbey.github.io/czml_generator

ht @underdarkGIS via FOSS4G’2018 Korea

#QGIS #flowmap #lines #3D #cartedeflux

Archivage tag’ [Appli] Flux, mouvements - anciennement sur Scoop-it

Curation réalisée de mai 2015 à avril 2018
–-> ▻https://www.scoop.it/t/analyse-des-matrices-de-flux
(arrêtée car le service auparavant gratuit est devenu payant)

Depuis avril 2018
–-> ici même sur SeenThis
(grâce au support de VisionsCarto @fil qui a permis le transfert de ces archives : Merci !)

#flowmap #worldmap #migration #trade #cartedeflux #curation #matrice #semio #figuré #procédé #représentation #distance #QGIS #R #application #animation #réseau #worldmap #gflowiz #webmapping #geoweb #geovisualisation

[QGIS] Travelling Salesman Problem (TSP) plugin | Magdalena Węgrzyn

Attention pépite ! ht Anita Graser @underdarkGIS

Le plugin permet de cartographier les résultats de la résolution du Problème du voyageur de commerce (PVC) ou Travelling Salesman Problem (TSP à savoir l’itinéraire optimal, le plus rapide ou le plus court, entre une série de points (x,y), en revenant au point de départ.

Le plugin utilise l’API Google Maps OpenRouteService API pour calculer les distances entre les points (l’utilisateur peut fournir ses propres clés pour cette API).

La donnée d’entrée est une couche de points, le résultat est une couche de liens représentant l’itinéraire. Le fichier est enrichit par la longueur de l’itinéraire et la durée du voyage, ainsi que l’ordre des lieux visités sous une forme descriptive. L’utilisateur peut fournir ses propres clés API Google Maps ou OpenRouteService API.

>>Télécharger le plugin : _▻http://plugins.qgis.org/plugins/TSP/_

https://pic.infini.fr/hzutGygD/F4KTJa5D.jpg

#QGIS #cartographie #trajectoire #itinéraire #réseau #optimisation #représentation #voyageur_de_commerce #PVC #TSP

Making Sense of Satellite Data, An Open Source Workflow : Accessing Data, by Rob Simmons
▻https://medium.com/@robsimmon/making-sense-of-satellite-data-an-open-source-workflow-accessing-data-8f7f3c

https://cdn-images-1.medium.com/max/1600/1*Fzm8Fh0bl2SnnTyCUl38Wg.png

#tutoriel (en quatre parties) #QGIS #images_satellite

[QGIS] Mapping Emotion : Fighting school closures with QGIS

▻https://medium.com/@tomchadwin/mapping-emotion-fighting-school-closures-with-qgis-28842661bf14

#QGIS #flowmap #3D #courbes #FOSS4G2018 #liens #cartedeflux #cartographie

Une exploration plutôt intéressante de la courbure des liens OD valués ou non... même si le fait de courber ces liens pose problème.

[Qgis] Spatialiser les trajets de BlaBlaCar | Boris Mericskay 
▻https://medium.com/@BorisMericskay/spatialiser-les-trajets-de-blablacar-dune-journ%C3%A9e-1-03-2018-7fb544dae07

#QGIS #flowmap #Blablacar

L’API de BlaBlaCar (
▻https://dev.blablacar.com/api-explorer/search-api/versions/1.0
) propose un explorer en ligne permettant de récupérer à la volée des données sur le service de covoiturage le plus…

Data exploration with Data Plotly for QGIS3
▻https://anitagraser.com/2017/12/06/data-exploration-with-data-plotly-for-qgis3

Data Plotly is a new plugin by Matteo Ghetta for #QGIS which makes it possible to draw #D3.js graphs of vector layer attribute values. This is a huge step towards making QGIS a one stop shop for data exploration!Currently, there are nine different plot types:

https://underdark.files.wordpress.com/2017/12/plotly.png https://underdark.files.wordpress.com/2017/12/plotly_ternary_graph.png https://underdark.files.wordpress.com/2017/12/plotly_box_graph.png

Hand-Drawn-ish Coastal Effects – Adventures In Mapping
▻https://adventuresinmapping.com/2017/12/05/hand-drawn-ish-coastal-effects

Well, #coasts have always been especially interesting things on atlases and globes. Here are two throwback methods for giving coastal areas a bit of offset contrast and a sense of depth and abrupt texture.

https://adventuresinmapping.files.wordpress.com/2017/12/polar.jpg https://adventuresinmapping.files.wordpress.com/2017/12/neuro.jpg https://adventuresinmapping.files.wordpress.com/2017/12/161.jpg

#map #mer

#QGIS plugin to show information about objects from #OpenStreetMap

Thanks to OpenStreetMap and beautiful #Overpass API you now can get all information for a particular point with our brand-new QGIS plugin. OSMInfo shows information about objects from OpenStreetMap using Overpass API.

▻http://nextgis.com/blog/osminfo
▻https://github.com/nextgis/osminfo

http://nextgis.com/wp-content/uploads/2015/12/example11.png http://nextgis.com/wp-content/uploads/2015/12/example21.png

▻https://www.youtube.com/watch?v=30ZT5hdjhuI

#osm

#Movement data in GIS 10: open tools for #AIS tracks from MarineCadastre.gov
▻https://anitagraser.com/2017/10/28/movement-data-in-gis-10-open-tools-for-ais-tracks-from-marinecadastre-g

MarineCadastre.gov is a great source for AIS data along the US coast.

One of the advantages of creating trajectory lines is that they render many times faster than the original points.

https://underdark.files.wordpress.com/2017/10/ais_trajectories.png

With the trajectories ready, we can go ahead and start exploring the dataset. For example, we can visualize trajectory speed and/or create animations:

https://underdark.files.wordpress.com/2017/10/ais_vessel.gif

We can also perform trajectory analysis, such as trajectory generalization:

https://underdark.files.wordpress.com/2017/10/ais_flows.png

#map #QGIS

Movement data in GIS #8: edge bundling for flow maps | Free and Open Source GIS Ramblings
►https://anitagraser.com/2017/10/08/movement-data-in-gis-8-edge-bundling-for-flow-maps

https://underdark.files.wordpress.com/2017/10/us_6clusters_withinset.png

One popular approach in the data viz community to deal with this problem is edge bundling. The idea is to reduce visual clutter by generate bundles of similar edges.

Surprisingly, edge bundling is not available in desktop GIS. Existing implementations in the visual analytics field often run on GPUs because edge bundling is computationally expensive. Nonetheless, we have set out to implement force-directed edge bundling for the #QGIS Processing toolbox [0]. The resulting scripts are available at ►https://github.com/dts-ait/qgis-edge-bundling.

The main procedure consists of two tools: bundle edges and summarize. Bundle edges takes the raw straight lines, and incrementally adds intermediate nodes (called control points) and shifts them according to computed spring and electrostatic forces. If the input are 72 lines, the output again are 72 lines but each line geometry has been bent so that similar lines overlap and form a bundle.

#cartographie #visualisation #états-unis #réseaux

#Movement data in #QGIS 7: animated trajectories with TimeManager

▻https://anitagraser.com/2017/08/14/movement-data-in-gis-7-animated-trajectories-with-timemanager

https://underdark.files.wordpress.com/2017/08/along_traj.gif

In this post, we use TimeManager to visualize the position of a moving object over #time along a #trajectory. This is another example of what is possible thanks to QGIS’ geometry generator feature. The result can look like this:

#map

Straight and curved arrows with #QGIS | Anita Graser
▻https://anitagraser.com/2017/04/29/straight-and-curved-arrows-with-qgis

Missing Processing Tools in Vector Menu - #QGIS 2.16

According to ▻https://hub.qgis.org/issues/15265, the GDAL tools might get lost if you have the processing tools installed as an external plugin.

Since some time, it has become a core plugin, so no need to be in the users .qgis2/python/plugins/processing folder. You can remove that savely.

▻http://gis.stackexchange.com/questions/202111/missing-processing-tools-in-vector-menu-qgis-2-16/202227

Lizmap Web Client - Feature Frenzy #cartographie #OSM #lizmap #maps
▻https://mdouchin.github.io/lizmap-presentation/index.html#

Visualize flows with FlowMapper via #QGIS Dutch Community
▻http://www.qgis.nl/2014/10/27/stromen-weergeven-met-flowmapper/?lang=en

https://img.scoop.it/lqbhE_4ktuT4p0lMxj66Rzl72eJkfbmt4t8yenImKBVvK0kTmF0xjctABnaLJIm9#.jpg

Share your insight

Crafting Data-Driven Maps – Uber Design
▻https://medium.com/uber-design/crafting-data-driven-maps-b0835b620554

https://cdn-images-1.medium.com/max/1200/1*n5hJwlMee4H99f4JW-42CA.png

#d3.js #mapbox #qgis #cartographie #design #outils

New style : conveyor belt flows

The QGIS map style I want to share with you today was inspired by a hand-drawn map by Philippe Rekacewicz that I saw on Twitter.

https://underdark.files.wordpress.com/2016/12/resourcesharing_conveyor.png

▻https://anitagraser.com/2016/12/08/new-style-conveyor-belt-flows

#map #qgis

ping @reka :)

Graphiques linéaires géospatiaux | datamix
▻http://www.datamix.fr/2015/12/graphiques-lineaires-geospatiaux

http://www.datamix.fr/wp-content/uploads/2015/12/joydiv_v2_2012.png

Le cartographe anglais James Cheshire a édité une carte de la population mondiale en s’inspirant de ce mode de réprésentation et Ryan Brideau a eu la bonne idée de rechercher et de publier le processus permettant de jouer avec ces lignes.

#visualisation #cartographie #méthodologie #R #QGIS

▻http://www.whackdata.com/2014/08/04/line-graphs-parallel-processing-r

http://i.imgur.com/SnWymMz.png

Movement data in GIS part 3: visualizing massive trajectory datasets | Free and Open Source GIS Ramblings

►https://anitagraser.com/2016/11/07/movement-data-in-gis-3-visualizing-massive-trajectory-datasets

https://underdark.files.wordpress.com/2016/11/trajectory_generalization_2.gif

While visualizing individual trajectories is important, the real challenge is trying to visualize massive trajectory datasets in a way that enables further analysis.

1) Extracting characteristic points from the trajectories
2) Grouping the extracted points by spatial proximity
3) Computing group centroids and corresponding Voronoi cells
4) Deviding trajectories into segments according to the Voronoi cells
Counting transitions from one cell to another

#map #qgis

Guide d’utilisation de #qgis 2.8 et 2.14
▻http://si.cenlr.org/Guide_utilisation_QGis_2_14.pdf

http://si.cenlr.org/sites/si.cenlr.org/files/couv_guide_utilisation_qgis_2_14.png

#map #documentation

Binning: An Alternative to Point Maps | Mapbox
▻https://www.mapbox.com/blog/binning-alternative-point-maps

Binning is a great alternative technique for visualizing density when working with large data sets.

https://farm8.staticflickr.com/7231/7267921806_e2abda6f0a_z.jpg

#map #qgis

How to create mountain ranges in #qgis?- Digital Geography
▻http://www.digital-geography.com/create-mountain-ranges-qgis

Last time we had the task to create mountain ranges polygons for the whole world. I prepared a small tutorial referred to that.

http://www.digital-geography.com/wp-content/uploads/2016/05/clip.png

http://www.digital-geography.com/wp-content/uploads/2016/05/selection1.png

#map #elevation