Map Basics For Noob
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Map Basics For Noob

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A presentation for Intridea Teahour.

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Map Basics For Noob Map Basics For Noob Presentation Transcript

  • Map Basics For NoobBy Andy Wanghttps://github.com/yorzi/map-basics-for-noob
  • Newbie?
  • Core Concepts1. GIS2. Map projections3. Coordinate systems4. Zoom levels5. Layers6. Spatial databases03
  • 1. Geographic Information System“GIS refers to any system dealing with the recording, analysis, or displayof data that is related to a location.”http://www.esri.com/what-is-gishttp://www.uwyo.edu/smtc/edparc/_docs/_arcview_tips/basicgisconcepts.pdf04
  • Sample project:http://globalreligiousfutures.org/05
  • 2. Map projections“Projections refer to the method used for representing a three-dimensional object like the Earth on a two-dimensional surface like asheet of paper or a computer screen.”https://github.com/mbostock/d3/wiki/Geo-Projectionshttp://en.wikipedia.org/wiki/Map_projectionhttp://www.jasondavies.com/maps/transition/06
  • Mercator projection“A transverse Mercator projection is mathematically the same as astandard Mercator, but oriented around a different axis.”07
  • Robinson projection“adopted by National Geographic Magazine in 1988 but abandoned bythem in about 1997 for the Winkel Tripel.”08
  • 3. Coordinate systemsProjections refer to the method used for representing a three-dimensional object like the Earth on a two-dimensional surface like asheet of paper or a computer screen.http://en.wikipedia.org/wiki/Geographic_coordinate_system09
  • Latitude and Longitude of the Earth10
  • 4. Zoom levels“A zoom level is a predefined scale at which a map is rendered.OpenStreetMap, Google Maps, and most other online maps zoom levelsare scaled such that the entire world fills a 256x256 pixel tile at zoomlevel 0, and doubles in width & height at each subsequent zoom level.”http://wiki.openstreetmap.org/wiki/Zoom_levels11
  • 12
  • 5. Layers“Data on different themes are stored in separate “layers”. As each layeris geo-referenced layers from different sources can easily be integratedusing location. Layer can be used to build up complex models of the realworld from widely disparate sources.”see some layer related charts.13
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  • 6. Spatial databases“A spatial database is a database that is optimized to store and querydata that is related to objects in space, including points, lines andpolygons.”http://en.wikipedia.org/wiki/Spatial_databasehttp://www.spatial.cs.umn.edu/Book/slides/ch1revised.ppt16
  • Postgres + Postgishttps://gist.github.com/yorzi/434502217
  • Quick Show-offs
  • Mapbox/TileJson + Wax + OpenLayerhttp://mapbox.com/wax/connector-ol.html19
  • Mapbox + D3https://gist.github.com/yorzi/543312520
  • D3 + SVGhttp://www.schneidy.com/Tutorials/MapsTutorial.html21
  • jVectorMaphttp://jvectormap.com/examples/usa-unemployment/22
  • Resources on Mapshttp://mapbox.com/mapbox.js/api/v1.0.0/http://mapbox.com/wax/http://modestmaps.com/http://leafletjs.com/http://jvectormap.com/tutorials/getting-started/https://github.com/mapbox/tilestreamhttp://openlayers.org/23
  • Resources on GIShttp://www.esri.com/http://lib.stanford.edu/gis/http://www.gislounge.com/gis-essentials/24
  • Thank You!