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Time periods for this study were determined based on the significance of hydrological
changes in
the urban landscape. For example, the map "Early Republic" begins in 312 B.C.,
the year that the
first Roman aqueduct was built.
Some timeline maps cover several hundred years
while others cover a period of only a few years.
This reflects the amount of documented activity. For example, little activity
has been documented for
the medieval period. Therefore the entire 900 years is covered in only three
maps. The 50 year period
from 1572 - 1622 was one of the most active in terms of changes to the Roman
waterscape and is
covered by three timeline maps, each referring to the pontificate of an individual
pope.
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This site is still under construction and is proceeding chronologically. Please be patient.
When a user selects one of the timeline maps, several viewing options pop up in the main window.
The option for JPEG displays a large image file which is the most useful tool for online viewing and
analysis. A JPEG can be downloaded, edited, printed, and shared in many different programs and contexts.
In addition the user can identify typo-logical elements such as fountains, marshes, rivers, etc. by simply
pointing to the object to be identified. The object name is displayed in the lower left corner of the browser
window. What's more, by clicking the element, the user can automatically search the Rome Archive for
more information on that particular item.
The option for the Colada Applet allows the user to zoom in and out of map areas by pressing the
plus and minus keys on the keyboard. Additionally, pressing the home key displays the map in its default view.
The Colada Applet is highly data intensive JAVA based applet that requires a high speed internet connection,
or a great deal of patience.
The option for Virtual Reality or X3D displays the selected map on
top of a three-dimensional topographical model of the city. X3D is the ISO standard XML-based file format for
representing 3D computer graphics, the successor to the Virtual Reality Modeling Language (VRML). Netscape and Internet
Explorer alone will not allow you to view X3D, but it may be viewed using one of various plug-ins.
The user can make connections and gain familiarity with water systems
much more readily by seeing the topography of the city in relief than by simply viewing a two-dimensional
topographical map.
All of these viewing methods provide the option to view the selected maps with an overlay
of the
contemporary city streets or of the contemporary topography.
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