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September 04 2013

How To Infer Topology

How To Infer Topology
http://bost.ocks.org/mike/topology

As its name implies, #topojson is a topological geospatial data format. In contrast to a geometry, where each shape is encoded with separate (and often redundant) arrays of coordinates, a topology encodes sequences of coordinates in line fragments called arcs that can be shared. The main benefit of a topology is that it improves shape simplification by avoiding artifacts that would be caused by simplifying shapes independently. It also enables applications like #map coloring and selective meshing, and makes the format more compact by removing redundant coordinates.

Mike Bostock explique le principe de fonctionnement de l’algo utilisé dans TopoJSON 1.4.0.

#geojson

August 12 2013

Simple, fast map data editing | MapBox

Simple, fast map data editing | MapBox
http://www.mapbox.com/blog/geojsonio-announce

We are trying to make it easier to draw, change, and publish #maps. Some of the most important geospatial data is the information we know, observe, and can draw on a napkin. This is the kind of #data that we also like to collaborate on, like collecting bars that have free wifi ✎ or favorite running routes.

http://geojson.io aims to fix that. It’s an an open source project built with #MapBox.js, #GitHub's powerful new Gist and #GeoJSON features, and an array of microlibraries that power import, export, editing, and lots more.

#données #cartographie #interface

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