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NACIS 2013: Cartography for a Changing Map
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mapbox
October 11, 2013
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NACIS 2013: Cartography for a Changing Map
Presented at NACIS 2013 in Greenville, SC.
mapbox
October 11, 2013
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Transcript
Cartography for a Changing Map AJ Ashton, MapBox
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Global • All the data OpenStreetMap has to offer, and
more • Multiscale: 20+ Web Mercator zoom levels • Multiple label language options
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Scalable • Cloud servers that get added and dropped constantly
can’t be too “heavy” • Tiles should load just as fast with 10 users as with 10,000 users • Apply different styles to the same underlying data
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Up to date • Currently sync with OSM every 5
minutes • We want this to be even faster • The world is always changing
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Global + Scaleable + Up to date A challenging combination
Global + Scaleable + Up to date + Make it
look good
Keeping up with OSM
OSM Changes 1.5 million changes per day over 1000 changes
per minute http://osmstats.altogetherlost.com
Most changes are small, but some have big consequences
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Cartography for a changing map: Simple things
Generalize
Normalization Cleaning OSM data for consistency
Cartography for a changing map: Not-so simple things
aka. Automatic manual tweaks
City labels
City labels • Custom list of scaleranks (based on Natural
Earth) and label direction hints • Fuzzy spatial & fuzzy text join function between incoming OSM data + our list
Airport labels/icons
Cartography for a changing map: Working with tiles
Tiles are small & static 256x256 pixels not a lot
to work with
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Tiles don’t know about other tiles
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The terrifying chaos label problem
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No perfect solutions Only mitigation strategies
Consistent ordering ORDER BY scalerank, population DESC, osm_id
De-duplicate at the data level GROUP BY ST_SnapToGrid(geom)
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