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September 04 2013

How To Infer Topology

How To Infer 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.


August 12 2013

Simple, fast map data editing | MapBox

Simple, fast map data editing | MapBox

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. 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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