Evangelism/Firefox3.5/35Days/Articles/geolocationDemo: Difference between revisions

Evangelism/Firefox3.5/35Days/Articles/geolocationDemo (view source)

Revision as of 13:14, 9 June 2009

989 bytes added , 9 June 2009

→‎Geolocation API and free data providers

Rldhont

19

edits

@@ Line 8: / Line 8: @@
 [http://3liz.org/geolocation/ Geolocation API Demo with OpenLayers, OpenStreetMap and GeoNames]
-The demo draws a map centered on the position given by the navigator.
+The demo draws a map centered on the position given by the navigator. But if you want to see where the navigator geolocalize you: ''Don't forget to click "Share location"''. The position is drawn with a red Marker.
-''Don't forget to click "Share location".''
-Ok, that's the basis of the Geolocation.
+With the position, the navigator gives an accuracy. The demo uses it to determine an extent to zoom to, and draws a cyan point representing it.
-But there are several data available in the Internet you can use to make your user happier, and some, are free (as a speech).
-You can see several information displayed around your location, like the names of cities, villages, lake, parks, ... all these information are from the GeoName service. If you click on the name, you'll see more information from Wikipedia. The map itself is free too (thanks OpenStreepMap).
+But wich is interesting with the position and its accuracy, is to provide geo-localized information to the user, and we can find free geo-localized information on internet.
+The first one is the base layer of the map in the demos : OpenStreetMap. It's a project to create and provide free geographic data such as street maps to anyone who wants them. In the demo you can see if free geographic data are available around you.
+The next one is wikipedia's articles. In some articles, like [http://en.wikipedia.org/wiki/Mountain_View,_California Mountain View] or [http://en.wikipedia.org/wiki/Montpellier Montpellier], you can find coordinates, and GeoNames provides a web service to query wikipdeia's articles with geo-localised parameters like an extent. In the demo, you can discover wikipedia's article around you.
+The last one is directly GeoNames information. GeoNames is a geographical database covers all countries and contains over eight million placenames that are available for download free of charge and provides web services to query this database. In the demo you can discover some information provides by GeoNames like cities, village, lake, parks, hotels wich you can find around you.
 The layer mechanism is powered by OpenLayers. A free Javascript library.