New Digital Globe Imagery in ArcGIS Online
In chapter 3 of our book The GIS Guide to Public Domain Data, we discuss the increasing resolution, types, and ways to access sources of imagery and the implications of these changes for data users. Last week, imagery and for the continental United States and 60cm imagery for large parts of Western Europe arrived on the ArcGIS Online platform.
According to the announcement, http://blogs.esri.com/esri/arcgis/2012/12/20/digitalglobe-imagery-for-the-united-states-and-western-europe-added-to-the-world-imagery-map/, this is the first of several planned releases of new imagery from DigitalGlobe that will include Europe and many other parts of the world.
Another very useful feature is that with the Identify tool in ArcMap or the ArcGIS Online Content Viewer, or even inside the ArcGIS Online map viewer, the resolution, collection date, and source of the imagery can be obtained at the location on which you click. The metadata applies only to the best available imagery at that location. You may need to zoom in to view the best available imagery. The service was updated on the following servers: services.arcgisonline.com and server.arcgisonline.com. If you have previously used the World Imagery map, you may need to clear your cache in order to see the updates. For example, in the area in which I am examining in San Francisco, the popup indicates that the imagery is from 26 October 2010 and is at 30 cm resolution.