The Lincoln Institute of Land Policy contains an extensive section of GIS resources for 120 cities around the world as part of their Atlas of Urban Expansion: http://www.lincolninst.edu/subcenters/atlas-urban-expansion/Default.aspx
These data include:
- Two urban land cover maps, one circa 1990 and one circa 2000;
- The administrative boundary shapefile;
- Two maps of the urban landscape categories, one circa 1990 and one circa 2000; rectified satellite imagery.
- The map of new development categories (infill, extension, leapfrog).
These data sets are excellent tools for research and teaching. Associated metrics, papers, and books are explained on the site as well. The other resources at the Lincoln Institute are worthwhile to investigate, on the topics of planning and urban form, valuation and taxation, and international studies.
As we state in our book The GIS Guide to Public Domain Data, areas around the world where not long ago it was very difficult for data users to obtain data are now opening up some of their data archives. One example is in Abu Dhabi, whose government is an extensive user of GIS technology. The Environment Agency Abu Dhabi recently launched an “Enviro-Portal”, announced during the Esri Middle East and Africa User Conference on GIS Technology solutions at the Abu Dhabi National Exhibition. This portal (http://enviroportal.ead.ae) offers access to environmental data such as geology, soils, flora, fauna, marine habitats, and protected zones within Abu Dhabi.
Some of the links offer historical data back to the 1990s. The site is available both in Arabic and in English. The “browse” function offers a straightforward way of offering the data, similar to a view of folders on one’s own computer. The metadata on the site is quite useful, and the data areavailable in a variety of formats, depending on the data type, from design files to shapefiles and geodatabases. On the “Download” tab, data users can download data by providing an email address. The site also offers a map gallery, from which the data user can search by theme but it also offers very helpful searching by polygon, line, or point buffer, shown in the image below.
As with any data portal, unique features of this portal require the data user to spend some time getting comfortable with the features and options. However, the wealth of data themes here makes it worth spending time with, and for a fascinating and rapidly changing part of the planet.
Interesting article published by the BBC on the next big frontier for the Internet – the Internet of Things. This next stage in the evolution of the Internet allows us to access and control an increasingly diverse network of devices and sensors, such as personal fitness monitors and many household items. There are applications available now for remotely controlling central heating systems, recording TV and video when we’re not at home, and keeping friends and families informed of our whereabouts. The Ford Motor Company recently announced a new initiative using their in-car connectivity system and an interface to a mobile tracking application, allowing drivers to share their location with friends and family directly from their cars using their smartphones and voice commands.
The early days of the Internet were all about people exchanging information. Now the technology has evolved to integrate many physical devices, allowing us to use the information collected by these devices to manage our lives more effectively. Almost inevitably, with many such innovations the attendant concerns of privacy and location tracking are raised. If I use my smartphone to adjust the central heating in my home to come on/switch off at certain times, and that information is stored on a network and accessed by others or my phone is stolen, that information could potentially be used by someone trying to gain access to the house when no one is in.
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.