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ANALYTICAL TOOLS INTERFACE FOR LANDSCAPE ASSESSMENTS (ATTILA) ARCVIEW EXTENTION
Citation:
Ebert, D W., T G. Wade, J. Harrison, AND D. H. Yankee. ANALYTICAL TOOLS INTERFACE FOR LANDSCAPE ASSESSMENTS (ATTILA) ARCVIEW EXTENTION. Presented at Towson University GIS Conference, Towson, MD, March 25-26, 2002.
Impact/Purpose:
The primary objectives of this research are to:
Develop methodologies so that landscape indicator values generated from different sensors on different dates (but in the same areas) are comparable; differences in metric values result from landscape changes and not differences in the sensors;
Quantify relationships between landscape metrics generated from wall-to-wall spatial data and (1) specific parameters related to water resource conditions in different environmental settings across the US, including but not limited to nutrients, sediment, and benthic communities, and (2) multi-species habitat suitability;
Develop and validate multivariate models based on quantification studies;
Develop GIS/model assessment protocols and tools to characterize risk of nutrient and sediment TMDL exceedence;
Complete an initial draft (potentially web based) of a national landscape condition assessment.
This research directly supports long-term goals established in ORDs multiyear plans related to GPRA Goal 2 (Water) and GPRA Goal 4 (Healthy Communities and Ecosystems), although funding for this task comes from Goal 4. Relative to the GRPA Goal 2 multiyear plan, this research is intended to "provide tools to assess and diagnose impairment in aquatic systems and the sources of associated stressors." Relative to the Goal 4 Multiyear Plan this research is intended to (1) provide states and tribes with an ability to assess the condition of waterbodies in a scientifically defensible and representative way, while allowing for aggregation and assessment of trends at multiple scales, (2) assist Federal, State and Local managers in diagnosing the probable cause and forecasting future conditions in a scientifically defensible manner to protect and restore ecosystems, and (3) provide Federal, State and Local managers with a scientifically defensible way to assess current and future ecological conditions, and probable causes of impairments, and a way to evaluate alternative future management scenarios.
Description:
Geographic Information Systems (GIS) have become a powerful tool in the field of landscape ecology. A common application of GIS is the generation of landscape metrics, which are quantitative measurements of the status or potential health of an area (e.g. ecological region, watershed or county). The generation of these metrics can be a complex, lengthy undertaking, requiring substantial GIS expertise. The U.S. EPA, in cooperation with TVA, has developed a user friendly interface to facilitate this process. ATTILA is an easy to use ArcView extension that calculates many commonly used landscape metrics. By providing an intuitive interface, the extension provides the ability to generate landscape metrics to a wide range of users, regardless of their GIS knowledge level.
Four groups of metrics are included in the extension: landscape characteristics, riparian characteristics, human stresses and physical characteristics. Each group has a dialog to accept user input on which metrics to calculate and what input data to use. Once metric values have been calculated, the extension provides four output display options. Areas may be ranked by individual metric values or by an index made up of two or more metrics. Bar charts or histograms may also be displayed.