DDA:  Taskforce to increase residential in the downtown
May 10, 2004
Audio file of Public Hearing of April 27, 2004, delivered in full form on CD, as a .wav file, to DDA;
edited version supplied here, about 5MB, takes about 1 hour to play
(only voices of Taskforce members or public officials are heard; last voice is that of John Hieftje, Mayor of the City of Ann Arbor)

The 3D modeling of the entire DDA is done using ESRI software so that the model works directly from existing city base map GIS files and associated database files.  The GIS is driven by the underlying database.  Hence, all information needed to do the mapping is available in the database (.dbf) files (which can be opened in Excel).  Here is some more information from the various databases associated with the variety of files (over 2000) generated in association with the various 3D models created in response to Ordinance Revision Committee (Planning Department and Commission), Taskforce, and other request (that has been ongoing over the past 2 or so years)

There are 739 buildings on 755 parcels in the DDA (some parcels have more than one building); some parcels have less than one building (a building overlaps more than one parcel), as with One North Main, Campus Inn, and Sloan Plaza.  Some of the new buildings, on vacant land or surface parking lots, also overlap more than one parcel, as in the Brown block or the Library block...and elsewhere in the yellow layer.  There are 418 parcels in the set of target parcels (see below* for definition) and 405 buildings on target parcels (again, some overlapping parcels but more frequently, there are multiple buildings on a single parcel).

Vacant or Surface Parking parcels

Parcel inventory:
Square footage background of base layer: * a target parcel is a DDA parcel that is not: public land, in an historic district, in the Allen Creek floodway, such that its centroid lies in the Allen Creek floodplain, a church parcel.


Building inventory, smaller than parcel inventory
The following table answers the following questions:
     How many square feet are there currently in the built buildings?  How many if all premiums were used?  How many if all buildings less than 6 stories were to grow to 6?
     In the target population, using building footprints, same questions as above--then, how many new square feet are brought in, in the target parcels, by such vertical add-ons?

Current All Premiums Used Six by right
All Buildings 7.5 million 13.4 million 15.6 million
Targets, only 4.9 million 8 million 9.3 million
New for targets a 3.1 million 4.4 million


May 10:
Response to public hearing in relation to 3D model buildout:

Total in this model, with expanded yellow layer reduced in height and the addition of S. University along with a reduction in the blue layer and in the N. Main layer:  5,351,209.778
Click here for virtual reality; download Cortona or Cosmo Player, first, then view in your browser.  There is the same set of viewpoints as previously available plus two new ones along South University.

Colored virtual reality model
Grayscale virtual reality model

An additional color (green) might be used to separate, visually, the Ashley/First buildings from others.  Added colors may offer certain focused clarification of the model; however, they also fragment the visualization power of the model, as a whole.  There are merits and drawbacks; the needs of individual cases will determine how many colors to use.

Animations of selected viewpoints from the Virtual Reality files; please feel free to suggest other viewpoints to put into the VR files.

Sequence of animation frames:  gray is existing followed by taller scene of April 27 followed by shorter scene of May 10.

View from South Main

View from Main and William

View from Main and Washington

View from Main and Huron, looking North

View from Main and Huron, looking West

View from Main and Huron, looking East

View along Huron looking East from the west side

View along Huron looking West from State

View along S. University looking East from the Diag

View along S. University looking West from Washtenaw

Links to similar approaches:


Solstice:  An Electronic Journal of Geography and Mathematics, Institute of Mathematical Geography, Ann Arbor, Michigan.
Volume XV, Number 1.