Geograph IL

What if you could hold Illinois in the palm of your hand?

Geograph IL is the Illinois version of the first GIS (geographical information system) for the iPhone.

Seismological risk, significant earthquakes, and congressional districts of Illinois
Unlike Google Maps, Geograph IL is completely self-contained, which means that it is always available, even without any cellular or wireless coverage. It can be used in the field, in the middle of nowhere. It can of course take full advantage of the iPhone's built-in GPS receiver (this is more limited on the iPod).
Surficial material, railroads and USGS quads near Springfield
Geograph IL contains a selection of geographical information in its internal database. By default, it comes with 30 different layers. Each layer can be individually shown or hidden, moved up or down, and made more or less transparent. This allows an almost infinite number of possible displays.

In addition, a number of extra layers can be downloaded right from the application, extending the capabilities of the application even further.

Aquifers, mineral resources and townships of northeastern Illinois

Each feature of most layers has additional information which can be displayed by tapping the feature. This brings up a list of all the data in all the displayed layers at that point.

The user can then select the desired layer and get all the available information. For instance, tapping an area of the Congressional District layer brings up a screen similar to the following:

With Geograph IL, you can finally access data that is relevant to you without needing access to a computer or a network.

Geograph IL can also generate high-resolution maps that you can download to your computer. The following shows the terrain of the Chicago region with roads, state house districts and Chicago neighborhoods superimposed (difficult to believe it was actually generated on an iPhone, isn't it?):