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United States Department of Agriculture

Agricultural Research Service

Title: Effects of GIS Derived Spatial Parameters at Various Resolutions on Watershed Analysis and Agnps Pollution Model Output

item Finn, Michael - USGS
item Bosch, David
item Usery, E - UNIV. OF GA
item Varanka, Dalia - USGS
item Krupinski, Timothy - USGS

Submitted to: International Geoscience and Remote Sensing Symposium Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: March 25, 2005
Publication Date: July 25, 2005
Citation: Finn, M.P., Bosch, D.D., Usery, E.L., Varanka, D., Krupinski, T. 2005. Effects of gis derived spatial parameters at various resolutions on watershed analysis and agnps pollution model output [abstract]. In: Proceedings of the IEEE International Geoscience and Remote Sensing Symposium, Soeul, Korea.

Technical Abstract: Researchers often generate digital geospatial data layers at various resolutions, and resample or aggregate to different raster pixel sizes to support environmental models at particular scales. Current efforts revolve around quantifying the significance that automatically generated spatial parameters at various resolutions have on the physical, chemical, and hydrologic model output. Using data from the Little River watershed in Georgia the impact of resampling on sediment, nitrogen, nutrients outputs was examined. This assessment of the effects of resolution on model output indicates that resolution and resampling of geospatial datasets contribute to the variance of output values from the AGNPS pollution model and that automated parameter generation for the AGNPS pollution model impacts the analyses of water quality and watershed investigations. Potentially, investigators can use these results to guide data collection efforts to minimize costs and to maximize efficiency.

Last Modified: 4/22/2015
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