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how vector maps work Vladimir Agafonkin

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April 2008

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a typical GIS talk

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rain.in.ua

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so I’m doing maps now, how hard could this be?

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maps huh? •a bunch of square pictures •drag them with a mouse •put some icons on top

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PFF

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Let’s build a mapping library from scratch!

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no way you could do that

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creating a web map in 2008

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You’re wasting time

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building from scratch; didn’t tell anyone

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Web Maps Lite

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born as a protest against bloat, clutter and complexity

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the number one mapping library in the world* *because the guy didn’t know shit about maps

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•extremely lightweight and simple •extremely easy to get started •huge community, tons of plugins •stable as a mountain •works everywhere (i.e. legacy browsers)

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raster tiles era

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OpenLayers

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• maps as background • mostly static • top-down, north-oriented • a rigid set of zoom levels • some simple vectors/icons on top • conceptually the same as 14 years ago Web maps status quo:

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Mapbox vision for maps: living, breathing, fluid, rich, powerful experiences that make you feel connected to the world Games did it for decades; why not maps?

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Evolution of The Elder Scrolls 2002 2006 2011

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Evolution of web maps 2002 2006 2011

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Digital maps before: exclusively web tech Digital maps now: native mobile apps + web

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Browsers before: display a bunch of text and images Browsers now: anything is possible

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vector maps raster maps

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let’s build a vector maps platform from scratch!

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vector maps era

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maps.me

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why vector maps?

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smooth zoom and rotation

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3D features

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full control over data presentation in real time

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any object on the map can be interactive

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data-driven styling

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real-time data analysis

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mourner.github.io/ road-orientation-map

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performance: rendering millions of features

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visual map editor

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mapbox.com/studio

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less bandwidth

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simulation vs cartography?

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github.com/mapbox/ mapbox-gl-js (JS) github.com/mapbox/ mapbox-gl-native (C++14) iOS, Android, QT, Node, OSX, Linux, Windows

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why isn’t WebGL everywhere yet?

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Let’s build something with OpenGL!

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OpenGL — 3D API?

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OpenGL is a low-level 2D API

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OpenGL: a technology for drawing triangles really fast

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drawing lines

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anti-aliasing

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6 triangles

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vertex attributes

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2 triangles

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line joins & line caps

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drawing polygons

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drawing polygons

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github.com/mapbox/earcut (JS) github.com/mapbox/earcut.hpp (C++)

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drawing text

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font textures

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unicode-intervals /Arial Regular/0-255.pbf /Arial Regular/256-511.pbf /Arial Regular/512-767.pbf

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SDF signed distance fields

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github.com/mapbox/potpack

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mapbox/tiny-sdf

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mapbox/ mapbox-gl-rtl-text icu4c C + Emscripten = JavaScript coming soon: WebAssembly

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placing labels

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mourner/rbush mourner/rbush-knn mourner/kdbush mourner/flatbush mourner/geokdbush mourner/geoflatbush

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loading and processing data

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mapbox/pbf (JS) mapbox/protozero (C++)

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6-7 times faster than JSON.parse Protocol Buffers: 3-4 times smaller than JSON (gzip)

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github.com/mapbox/ vector-tile-spec

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mapbox/geojson-vt (JS) mapbox/geojson-vt-cpp (C++)

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mapbox/supercluster (JS) mapbox/supercluster-hpp (C++)

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mapbox/polylabel (JS, C++)

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main thread (UI) processing loading data web workers processing loading data processing loading data

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continuous testing

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1082 render tests

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mapbox/pixelmatch (JS) mapbox/pixelmatch-cpp (C++)

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AppVeyor

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hey, what’s there on the server side?

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the essence of software engineering is mitigation of complexity

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vastly bigger scope, same goal: let people build amazing maps

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Díky moc! agafonkin.com