2004 UC Proceedings Abstract
 Web-Based Map-Algebra Challenges: A Polygon Solution Track: Application Development Author(s): Wolfgang Grunberg, Noah Lerman, Michael Haseltine, Barron Orr, Aaryn Olsson, John Dale ArcIMS is optimized for rendering vector and static spatial data, but is less suited for manipulating raster and dynamic data through grid calculations. This issue was a central challenge in the strategic model of human and climate interactions with wildfire developed in the EPA Star Grant-funded "Wildfire Alternatives" (WALTER) project. To overcome this constraint, a polygon ArcSDE layer that imitates grid cells was employed as the foundation for all model inputs and outputs. This "grid-polygon" layer matches the minimum mapping unit of the original raster input layers. The grid-polygon cell attribute tables stored in the model database are joined through ArcIMS with the ArcSDE layer's business table. This setup permits the use of map algebra to calculate cell values on-the-fly so that user-specified parameters can be passed on and used by the Web application for the model. Model results are then rendered in ArcIMS by using database driven color maps. Wolfgang Grunberg The University of Arizona Arizona Remote Sensing Center 1955 E. Sixth St., Suite 205 Tucson , AZ 85719 US Phone: 520-621-5694 Fax: 520-621-3816 E-mail: grunberg@email.arizona.edu Noah Lerman The University of Arizona Arizona Remote Sensing Center 1955 E. 6th Street, Suite 205 Tucson , AZ 85719 US Phone: 520-621-5694 E-mail: nmlerman@email.arizona.edu Michael Haseltine The University of Arizona Arid Lands Information Center 1955 E. 6th Street, Suite 205 Tucson , AZ 85719 US Phone: 520-621-8576 E-mail: haseltin@u.arizona.edu Barron Orr The University of Arizona Arizona Remote Sensing Center 1955 E. 6th Street, Suite 205 Tucson , AZ 85719 US Phone: 520-626-8063 E-mail: barron@ag.arizona.edu Aaryn Olsson The University of Arizona Arizona Remote Sensing Center 1955 E. Sixth St., Suite 205 Tucson , AZ AZ 85719 US Phone: 520-621-8560 E-mail: aaryn@ag.arizona.edu John Dale The University of Arizona Arizona Remote Sensing Center 1955 E. Sixth St., Suite 205 Tucson , AZ AZ 85719 US Phone: 520-621-5694 E-mail: jcd@downinthedesert.com |
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