Posts Tagged ‘openstreetmap’

  • OffMaps – Allows to use maps without Internet Connection

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    OffMaps is an application for the iPhone or iPod touch which can be downloaded via the Apple AppStore.  Online map services consume quite a bit of bandwidth and mobile internet services are often limited. Therefore many users are looking for offline solutions for map services. Map services are of particular interest if your are travelling abroad. And in this case roaming charges can be very expensive.  Also the fast access to maps at remote destinations can be enhanced.

    This video was embedded using the YouTuber plugin by Roy Tanck. Adobe Flash Player is required to view the video.

    OffMaps used the community driven map service platform OpenStreetMaps. OffMaps allows you to access maps and location bookmarks and stores Openstreetmap snapshots directly on the device for any area and zoomlevel. It also has two modes:

    • an online and
    • an offline mode.

    Whenever possible OffMaps will use the online mode, but this can be configured. In online mode you can pan and zoom normally through the world map. Map images that have not been cached will automatically be loaded and saved to the cache for later offline use. You can also search for locations around the world, add bookmarks and preload whole areas in a zoom range of your liking. Of course you can view your own location too.
    In offline mode you can only view maps of areas that you have previously seen or preloaded. You can view your current location and bookmarks, but can’t use the search as this requires the large CloudMade database that is only available online. You can even add local bookmarks by tapping the map at any location.

    screen-en-1 screen-en-3

    Features:

    • Maps with cache and download function
    • Online Search for places, cities and features
    • Bookmarks (offline and online) with internal search
    • Display of own current location with accuracy indicator
    • Map scale in kilometres or miles

    Storage Space of Offline maps by cities:

    City Most detailed -1 zoomlevel -2 zoomlevels
    Barcelona, ES ~37 MB ~10 MB ~3 MB
    Berlin, DE ~125 MB ~35 MB ~8 MB
    Boston (incl. Cambridge), USA ~50 MB ~13.1 MB ~5 MB
    London (center), UK ~30 MB ~9 MB ~3 MB
    New York (incl. Jersey City), USA ~170 MB ~45 MB ~12 MB
    Paris, FR ~60 MB ~15 MB ~4 MB
    San Francisco, USA ~75 MB ~20 MB ~6 MB

    At the most detailed zoomlevel the screen covers approx. 300 meters in width, at the medium details approx. 600 meters and at the “Important streets” level it covers approx. 1km in width.

    [via offmap.net]

  • Cloudmade – An alternative Javascript mapping API

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    CloudMade was founded by Steve Coast and Nick Black in 2007 to provide services around open mapdata. Steve Coast is also the founder of OpenStreetMap (OSM), one of the most prominent source for free map data based on the wiki idea. Therefore there is a strong relationship between OpenStreetMap and CloudMade, with the aim to “continue the democratization of geo data and to expand access to open geo data through a range of simple yet powerful tools and APIs.

    The current version of their APIs allows developers to integrate OpenStreetMap data into mobile and web-based applications. The major differences between most of similar services (beginning with Google Maps API), the CloudMade team highlights to be free from restrictive licencing.

    Currently their APIs are closed pre-Alpha and is only available to registered users. To take part on this program you can sign up. They follow a bottom up approach and try to reduce complexity in terms to use geographical tools.

    [via CloudMade]

  • Open Street Maps as Shapefile for your GIS

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    The German company Geofabrik is specialized to neogeography and open geospatial data. Now they provide the download of OpenStreetMaps as daily updated shapefiles

    The data on their server are regional hierarchical structured. All shapefiles are based on OpenStreetmap-raw data. This XML-based file format dist described  in the OpenStreetMap-Wiki at OSM Protocol Version 0.5.

     

    But not all layers of the available OSM data is converted special layers can be requested as additional service.

    OSM data is available under Creative Commons Attribution-Share Alike 2.0-License.

    [via Mapperz]

  • 4 Years OpenStreetMap – Details & Interviews

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    Two years ago OpenStreetMap (OSM) was completely unknown in the german-speaking community and central Europe. Today several places in the world have already very detailed and sophisticated maps, produced by volunteers. People uses GPS devices or local knowledge to make existing maps more detailed.

    Frustration about the high prices for geospatial data was the motivation for Steve Coast to start the OpenStreetMap project in 2004. Four years later the project developed from an idea to a world-wide map, where thousands of people are participating. Everyone can use the map for free, to embed it on the own web site.

    In the past every five months the user doubled, and in the end of 2009 there should be ten times more users than today. And these users will add 200.000 km per day, so the estimations. Indeed, OpenStreetMap is more than a simple streetmap. The map includes information about roads and their environment as well as Points Of Interest (POIs). Questions like, “Where is the next postal office?”, “Where is the next toilette?”, or “Where can I find the next WiFi Access Point?” can be answered. How this can look like shows the POI Control. This web site used OpenStreetMap and analyzes stored POIs.

    Of courses some places, especially important towns, are very detailed while other parts are more or less empty. If inhabitants didnt know about OpenStreetMap this can also be seen on the map. For example parts of Spain are not collected. In the USA freely available TIGER data was integrated in OpenStreetMap.

    This picture shows a comparison of the city Villach, Austria (pop. 58000) in Google Maps and OSM.

    One other important service is routing. An important service which uses OpenStreetMap data is OpenRouteService.org as reported in June.

    Following I have summarized important issues form an interview with Frederik Ramm about OSM:

    Q: There is Google Maps. Why is there also OpenStreetMaps?

    Ramm: Google Maps doesn’t offer their data. You can view their maps, but you can not render maps in your own style. You also cannot put your own routing algorithms on to of the map or calculate the density of letter-boxes for German towns. Google has maps – OpenStreetmap has geodata. That’s an enormous difference. Everyone can participate; a corrected error, a new build road can be found within hours on the map. And finally OpenStreetMap has a free licence, you can use the data for all of your own projects. With Google Maps you cannot do this.

    Q: Google has introduced Map Maker and Pedestrian routing recently. Is this a reaction to the OpenStreetMap project, which does not only concentrate on vehicles? Or only a logical improvement?

    Ramm: Map Maker a Google services which is based on a technique, that was used for internal data acquisition in India. Google would like to buy map data simply form agencies but for a lot of areas there are simple no useful data available. With Map Maker Google tries to fill these gaps. But we see it relaxed. Google will encourage a lot of people for this project and OpenstreetMap will also benefit. For pedestrian routing it is similar.

    Q: Where are the strenghts of the OpenStreetMap project?

    Ramm: Free accessibility of data is an enormous potential for creativity. Every few weeks there is somebody who has worked on a software fir OSM. One further strength is that everyone can participate and provide her/his expert knowledge about a local region. The community is the core of the project. Competitors are driving their surveying vehicles. With this technique you cannot get the secret paths between two house blocks.

    Q: And where are the weaknesses?

    Ramm: There is no complete worldwide coverage. Yet. Further, the community is fixed on map visualisation. This leads to missing Information. There is also no mechanism which can evaluate the completeness and correctness of the data.

    Q: What’s about mobile devices?

    Ramm: At this years ‘State of the Map’-Konferenz Nick Whitelegg has introduced Freemap Mobile, a J2ME-application for hikers. A complete editor for a mobile platform is not available but moving map and routing works for a lot of applications. Navit is one example which works with the Nokia N810, but also with other Windows mobile devices. Definitively, there is potential.

    [via Golem.de]

    Written and submitted from Home, using my 802.11g WiFi network.

  • Opensource, OpenLS and OpenStreetMaps for a OpenRouteService

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    Open Source GIS solutions gain more and more attention in the Geoinformation sciences community over the past years. Now there are numerous usable and stable Open Source libraries and tools for spatial data management, customization and visualisation available. Open Source in general has a very strong relation to topic of Interoperability and Open GI Standards (e.g., Standards specified by the Open Geospatial Consortium (OGC)).

    The OpenRoutingService.org initiative has worked on the OGC Specification “Open Location Services” (OpenLS) Before the implementation of OpenRoutingService.org several other services based on open standards have been realized. In near futures these implementations should be available at http://www.freeOpenLS.org.

    Since April 8th of this year OpenRoutingService.org is accessible online. The services uses free geodata from OpenStreetMaps (OSM) and provides routing functionality based on the OGC LopenLS Route Service Specification. The plan is to provide routing based on OSM also for other software systems or as web service. Currently the service is enhanced in case of functionality, because until now it is limited to Germany. The area of Germany in OSM covers more than 600.000 streets, which must be transformed into topological graphs for the routing module. During this transformation more then 1.3 million features are generated.

    They have tested the performance with different routing-libraries (geotools, pgrouting) and algorithms (Dijkstra, A*).

    One further interesting feature of OpenRoutingService.org is the “Avoid Area” function. Here the user can enter an area (e.g, dangerous area), which is excluded in the routing process.

    [via: Zur Kopplung von OpenSource, OpenLS und OpenStreetMaps in OpenRouteService.org (Neis, P., Zipf, A.)]

    Written and submitted from Home, using my 802.11g WiFi network.