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.
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| Seismological risk, significant earthquakes, and congressional districts of Illinois |
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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).
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| Surficial material, railroads and USGS quads near Springfield |
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HOW DOES IT WORK? |
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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.
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| Aquifers, mineral resources and townships of northeastern Illinois |
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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.
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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:
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With Geograph IL, you can finally access data that is relevant to you
without needing access to a computer or a network.
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