Kendal GIS Map Legend

John Bartram Arboretum at Kendal at Oberlin
Guide to the Geographical Information Systems (GIS) Map

The aerial image of the Kendal Campus was kindly supplied by the Lorain County Auditor’s office. The Spring 2017 aerial is the most recent high resolution image available. It has a higher resolution than Google Maps. Use the hand pointer to grab and move the map (click and hold).
Markers represent individual trees. Use your mouse or pointer to click on a marker. A dialog box will appear presenting the common name and the binary or the scientific genus-species name of the tree. Latitude and longitude are also displayed. Clicking on markers for the Heiser Circle Tree Walk also produces a clickable link to an external web site that provides additional information about the tree. Click on the markers for commemorative trees to produce information about the honoree and donor.

Here is what else you will see:

  • When you open the map, you may be asked whether it may use your current location. If you click yes, a blue dot with a light blue halo will appear showing your current location. (The halo is an estimate of the position accuracy based on cell phone signals. You can turn this feature on or off by clicking on the “show me where I am” icon on the upper left.)
  • The + and - buttons allow you to zoom in or out of the image. You should also be able to zoom with your mouse or touch pad.
  • On the upper right corner there is a small ruler. Click on this to measure the distance between points on the map.
  • Below that there is an icon that looks like a stack of papers or a book. Click to see a legend that explains map features with a box next to each feature. Check or uncheck the box to the left of the description of the feature to turn it on or off.
  • The magnifying glass-like icon is a search feature. Enter a tree number and a red circle will appear around the numbered tree.
  • Commemorative trees and trees on the Heiser Tree Walk are identified by different colored markers. Some trees are in more than one category.
  • The locations of blue bird boxes and benches were determined using the Trimble device or the Auditor’s map, respectively. Benches are marked as private (owned by Kendal residents) or Kendal (owned by Kendal). Note, some benches may be removed during the winter or for maintenance.
  • Grids and boundaries were determined by the Arboretum Committee.
  • The five semi-transparent areas were defined developed from recommendations of the Tree Commission Academy and may be used to define regions where trees are slated for evaluations and treatment on a five year cycle. The boundaries were marked using the Trimble device. You may want to turn this feature off.


The creation of a GIS map requires accurate latitude and longitude data. These were acquired by locating individual trees as defined by the Arboretum's database number on the map available on the Auditor’s web site. The Auditor's map has a tool that displays a highly accurate latitude and longitude of any clicked location. Other tree locations and the locations of bluebird boxes were measured using a Trimble Geo 7X and associated software.

The map was created using QGIS 2.18 “Las Palmas.” This is free, open-source GIS mapping software. Although more recent versions are available, this release is stable and manuals and tutorials refer to this version. See www.qgis.org for more information and links to tutorials.