OpenStreetMap louis liu
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OpenStreetMap (OSM) is a collaborative project to create a free editable map of the world. Users can add and edit map data by uploading GPS traces or extracting information from other sources like aerial imagery. This data is stored in a central database and can be viewed and edited by anyone on a web map or using desktop editors. The map is rendered from the database using open source tools and can be used freely under an open license. Developers contribute by improving the tools, database, rendering system, and applications that make up the OSM project.
OpenStreetMap louis liu
- 1. The technical overview of Open Street Map 劉俊宏 [email protected]
- 3. OpenStreetMap (OSM) follows a similar concept as Wikipedia does, but for maps and other geographic facts. This information then gets uploaded to OpenStreetMap's central database from where it can be further modified, corrected and enriched by anyone who notices missing facts or errors about the area.
- 4. Anyone can freely download and use the full information for any purpose they like under an open source license.
- 7. Slippy Map, the map viewer. Potlatch, the online map editor. Export, export map data to xml data, image, or embedded html. Mapper system Account setting, query other mappers' information, sending/receiving messages, upload GPS traces, writing diaries...
- 8. Slippy Map Base Layer: Mapnik The default map. Osmarender The alternative map. Cycle Map The map for cycling. NoName Fine ways without naming. Overlays Data View OSM data and it's edit history.
- 9. The Major Component of OSM system
- 10. Data Source
- 11. GPS traces, the major data source of OSM.
- 12. Upload GPS Traces http://www.osm.org/traces/tag/Taiwan If you do not want your GPX points to be seen by anybody else, DO NOT upload tracks. ` Must be GPX (gziped or flat) file format. GPX trace file should consist of track points with valid time stamp.
- 13. Other data source Yahoo! Aerial Imagery Yahoo! have agreed to let OSM use their aerial imagery for the purposes of tracing. It is possible to sketch in the road layout for large expanses of urban areas, without going there. Cirerone Mapped Taipei with Yahoo! Aerial Imagery. Open Aerial Map The site is currently offline.
- 14. Convert from other open map data TIGER Tiger, Topologically Integrated Geographic Encoding and Referencing system data for US streets, produced by the US Census Bureau, is a public domain data source. AND Automotive Navigation Data donated the entire streetmap of the netherlands.
- 15. DO NOT Copy from copyrighted map!
- 16. Basic Element Node Nodes consist of latitude and longitude. Nodes are needed to define a way, but a node can also be a stand alone unconnected point. Standalone nodes should always have at least one Tag. Nodes forming part of a way open do not have tags themselves.
- 17. Way A way is an ordered interconnection of at least 2 nodes that describe a linear feature such as a street, railway, river … Ways should be split into shorter sections if different properties exist. Nodes can be members of multiple ways. Area (Closed way) Areas are not separate elements, they are merely closed ways that represent an area.
- 18. Relation A relation can group other elements together, nodes, ways and maybe even other relations. Relations can be used to represents things like cycle routes, bus routes, turn restrictions, boundaries....
- 19. Tag A property attached to a node, way, area or relation. These properties are Key-Value pairs describing the element.
- 20. To ensure that applications and other users of the OSM data can interpret the tags in a meaningful way it is recommended but not required to follow certain tagging standards documents. http://wiki.osm.org/wiki/Map_Features http://wiki.osm.org/wiki/Tw:Taiwan_road_tagging http://wiki.osm.org/wiki/tagwatch
- 21. Key Value highway tertiary ref TC-26 name Dama Rd. name:zh 大馬路 is_in Waipu Township, Taichung County is_in:zh 台中縣外埔鄉
- 22. Editor
- 23. Potlatch A Flash based online Map editor, you can found at “Edit”tab on home page. Potlatch is intended as as an easy-to-learn editing environment for drawing ways and adding metadata to existing ways.
- 24. Merkaartor OSM Editor for UNIX, Windows and OS X. Map view near- WYSIWYG, anti- aliased, with road names. Live connection to your GPS.
- 25. JOSM Java OpenStreetMap Editor JOSM is a feature-rich editor. Highly configurable and extensible via plug- ins. Can work off-line using download data files. Work with local photo and GPX files. It's POWERFUL but Not Easy to learn.
- 26. Edit map with GPS tag image.
- 27. Using Yahoo! Aerial Image as background.
- 28. ArcGIS Editor for OpenStreetMap http://martenhogeweb.blogspot.com/ 2010/07/ announcing-arcgis-editor-for.html http://tinyurl.com/2wgmhu5
- 29. API and Back End System
- 30. OSM API OpenStreetMap has an API for fetching and saving from/to OpenStreetMap database. The API is the server component to which REST requests are addressed. The REST requests take the form of HTTP GET, PUT, POST, and DELETE messages. Any payload is in XML form, using the MIME type "text/xml" and UTF-8 character encoding.
- 31. All of the calls to the API which update, create or delete data have to be made by an authenticated and authorized user. Authentication works by using HTTP Basic authentication using an user name and password or by using OAuth.
- 32. ADD/REMOVE/UPDATE elements. Download data inside a given bounding box. Query history of elements. Retrieving GPS points/traces. .....
- 33. Changesets To make it easier to identify related changes the concept of changesets is introduced. Every modification of one or more of the elements has to reference an open changeset. Changesets are specifically not atomic - elements added within a changeset will be visible to other users before the changeset is closed.
- 34. Changesets facilitate the implementation of rollbacks. By providing insight into the changes committed by a single person it becomes easier to identify the changes made, rather than just rolling back a whole region.
- 35. Current Version is 0.6. http://wiki.osm.org/wiki/API_v0.6 For testing: http://api06.dev.openstreetmap.org
- 36. OSM API Server The Rails port is the current version of OSM's server code - API, web front end and everything that runs on www.openstreetmap.org. Runs on Unix-like systems.
- 37. Planet.osm a snapshot of the OpenStreetMap database. the latest revision of the nodes, ways, relations and changesets an XML formatted .osm file. http://planet.openstreetmap.org/ Current file size: 8.3GB (Bzip2 compressed, 2010 04/12) Extrats: partical area of planet.osm Osmosis and other tools can handle it.
- 38. Rendering System
- 39. Mapnik http://mapnik.org/ Mapnik is a open source toolkit for rendering maps. OSM uses Mapnik to render 256 × 256 pixels tiles. Use Postgres as data backend and import osm data source to db with osm2sql. A template.xml controls style sheet. It's need several hours to generate Taiwan nearby tiles.
- 40. mod_tile and rendered An Apache module which is responsible for requesting tiles. renderd - A rendering daemon which calls mapnik and writes the map tiles to the filesystem If the tiles are already rendered then Apache will serve them efficiently from the filesystem.
- 41. Tile@Home We all heart SETI@Home. A Distributed tile render system. There are many people who run the client software on their computers that ask what map- tile to render and contribute their results back to the server. Osmarender and http://informatinofreeway.org/ uses T@H.
- 42. Play with planet.osm and render style sheet to meet your need.
- 43. OpenCycleMap.org
- 44. Mapper Community
- 45. wiki.openstreetmap.org Mediawiki is OSM's document system. News. Instructions for Mapping. License information and other issues. Development information. Wiki project pages for mapping different countries or cities. References for map features (tags). A voting system.
- 46. Contact other mappers Mail List OSM-talk, talk-tw, osm-dev...... Send Message Send message in http//osm.org. Discussion in wiki's “talk page” Join local mapper group Map Party is fun!
- 47. Open Street Map and Open Source Develop tools, Database, rendering tools... are all open source software. OSM's applications and sites are also open sourced. Fetch the source code: svn co http://svn.openstreetmap.org/
- 48. Why use open source Use open source software to process open data. Standing on Shoulders of Giants. Save data in open file format. Free from proprietary format. Users won't buy 'professional tool' to use the open geography data.
- 49. To Be A Mapper Wiki is your friend Beginner's Guide Map Features Editing Standards and Conventions Mapping techniques Join local mapper group
- 50. 2010 08/07 Map Party @Tainan http://registrano.com/events/b2daeb
- 51. To Be A Developer Wiki is your friend #OSM-dev list. Read The Find Manual. Read The Find Source Code. Observe develop tools' license. Do NOT break OSM license and policy. Ask the community for help!
- 52. Thank you for participation