Abstract
Using Plot vs. GIS-Derived Environmental Variables to Evaluate Bird Habitat Track: Modeling Author(s): Jennifer Rechel It has become commonplace to substitute 30m resolution GIS-derived environmental variables for plot sampled habitat variables. However, this approach ignores the problems associated with generalized geospatial data in a GIS layer when analyzing and mapping habitat data for birds with territories and movements at scales finer than 30m. Habitat variables include elevation, aspect, slope, dominant vegetation type, understory vegetation, presence of water, and extent of local disturbances. The objective is to quantify differences among TM (30m), and IKONOS (1-4m) satellite imagery and plot-level data. Measurements at 84 bird plots (160 vegetation plots) are used to calibrate the image-based variables to improve habitat mapping at broader scales. Plot-level data is best to evaluate and map bird habitat use at local sites. IKONOS and TM spectral responses should be developed separately for each major habitat type and then combined with the plot-level data for landscape level avian habitat use and mapping studies. Jennifer Rechel USDA Forest Service Forest Fire Laboratory 4955 Canyon Crest Drive Riverside , CA 92507-6071 US Phone: 951-680-1541 E-mail: jrechel@fs.fed.us |
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