Characteristic length scale of input data in distributed models: implications for modeling grain size

Journal of Hydrology
By: , and 

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Abstract

The appropriate spatial scale for a distributed energy balance model was investigated by: (a) determining the scale of variability associated with the remotely sensed and GIS-generated model input data; and (b) examining the effects of input data spatial aggregation on model response. The semi-variogram and the characteristic length calculated from the spatial autocorrelation were used to determine the scale of variability of the remotely sensed and GIS-generated model input data. The data were collected from two hillsides at Upper Sheep Creek, a sub-basin of the Reynolds Creek Experimental Watershed, in southwest Idaho. The data were analyzed in terms of the semivariance and the integral of the autocorrelation. The minimum characteristic length associated with the variability of the data used in the analysis was 15 m. Simulated and observed radiometric surface temperature fields at different spatial resolutions were compared. The correlation between agreement simulated and observed fields sharply declined after a 10×10 m2 modeling grid size. A modeling grid size of about 10×10 m2 was deemed to be the best compromise to achieve: (a) reduction of computation time and the size of the support data; and (b) a reproduction of the observed radiometric surface temperature.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Characteristic length scale of input data in distributed models: implications for modeling grain size
Series title Journal of Hydrology
DOI 10.1016/S0022-1694(99)00176-6
Volume 227
Issue 1-4
Year Published 2000
Language English
Publisher Elsevier
Contributing office(s) Earth Resources Observation and Science (EROS) Center
Description 12 p.
First page 128
Last page 139
Country United States
State Idaho
Other Geospatial Upper Sheep Creek
Online Only (Y/N) N
Additional Online Files (Y/N) N