Geospatial technologies have emerged over the last 15 years as one of the key tools used by environmental scientists (NRC 2006). In fact, educators have recognized that coupling geospatial technologies with environmental science topics and scientific data sets opens the door to local and regional scientific investigations (McInerney 2006). In this article, the authors describe the use of geographic information system (GIS) technologies and computer modeling to engage students in determining the economic and ecological value of trees in their neighborhoods while participating in the Urban Tree Project. (Contains 2 figures.)