Tree Inventory

In May 2009, the city completed a comprehensive tree inventory. The tree inventory provided the species, size, diameter, geo-coded location, condition and maintenance needs of all city managed street trees and park trees in mowed areas. The tree inventory data was added as a layer on the city’s geographic information system (GIS) and integrated with the asset management software Cityworks, which enables the City to manage trees in the same manner it manages other City assets.

The City began its inventory of all city managed trees in the right-of-way and city parks in February 2009 as the first step in developing the City's first urban and community forest management plan. The City contracted with the Davey Resource Group, a Division of the Davey Tree Expert Company to conduct the inventory.

Snapshot of the Tree Inventory- based on the original May 2009 inventory data

40,749 Street Trees

6,610 Park Trees (in mowed areas)

8,853 Potential Planting Sites

843 Stumps

TOTAL: 57,055

Pie chart depicting urban forest diversity by genus

Accesing the Tree Inventory
The tree inventory can be accessed by going through the mapAnnArbor website or downloading the data through GoogleEarth. Both MapAnnArbor and GoogleEarth provide the inventory in a map-based format.

MapAnnArbor website

MapAnnArbor is partnership between the City of Ann Arbor and Washtenaw County.

1. Click on this URL or paste in your browser window: http://gisapp.ewashtenaw.org/mapannarborx/Viewer.html?Viewer=A2Trees

2. The red tool box in the upper right corner below the search box will open tabs to help navigate around the site, add other layers to the map, print/edit the map and do analysis.

3. To zoom in you can either scroll with the mouse wheel, click on the “+” or “-“ buttons in the top left corner or use zoom in/out in the “Getting Around” tab.

4. To search- type in an address in the “Search for map features” in the upper right corner.

5. To pan around the map (make sure the i- Point Identify tool is not selected)- place your mouse pointer on the map and click and drag in the direction you would like to move.

6. Once you see the tree you are interested in you can either right click on the tree and select “What’s Here” or go to the “Getting Around” tab and click on the “i- Point Identify” tool and move your mouse over the tree and select it. This will provide basic information on the tree, for more detailed information click on “View Additional Details.”

Google Earth

Download and install the free Google Earth software.
Right click the map files (below) and save them to your computer. The names of the files correspond to the seven areas of the city depicted in the break-out map.
Open Google Earth on your computer.
In the upper left corner, click on File, then Open, and then navigate to the map files you downloaded in Step 2. Select and add one or more files. You can add one file if you're only interested in viewing a certain area of the city, or you can add all seven files for a comprehensive view of Ann Arbor's urban forest.

Google Earth Map Files
Central (A2TreeC)                    East (A2TreeE)
Northeast (A2TreeNE)              Northwest (A2TreeNW)
Southeast (A2TreeSE)             Southwest (A2TreeSW)
West (A2TreeW)

Map of tree break-out areas

Additional Tree Inventory Information

Tree inventory data as provided to the city by The Davey Resource Group in May 2009 (25 MB Microsoft Excel Spreadsheet). Please note: this version does not contain any changes (including planting or removals) to the tree inventory that have occurred since May 2009.
Tree Inventory Analysis report (276 page pdf)
Tree Inventory Definitions (pdf)
Calculated Public Tree Values and Benefits (pdf)

Any questions regarding the tree inventory or data can be directed to Kerry Gray, Urban Forestry and Natural Resources Planning Coordinator at 734-794-6430 x 43703 or kgray@a2gov.org.

Last Update: November 23, 2011