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TitleSpatial Variability in Soil Moisture Pasture Fields Using ERS-1 SAR: Implications for Streamflow Modelling
AuthorSoulis, E D; Seglenieks, F; Pultz, T J; Kouwen, N; Rotunno Filho, O C
SourceInternational Symposium, Geomatics in the Era of RADARSAT (GER'97), Ottawa, Canada, May 25-30; 1997 p. 8
Alt SeriesEarth Sciences Sector, Contribution Series 20042212
AbstractPasture fields are attractive as repeatable targets for index fields to estimate the distribution of soil moisture in a basin. The Grand River '93 experiment was conducted to investigate the relationship between backscatter in ERS-1 imagery and soil moisture in pasture fields. A subset of 28 fields, distributed over a 50 km by 60 km area, was sampled for each of 8 daytime overpasses. Within scene correlations are poor but between scene results are significant. An adjusted r 2 of 0.849 was achieved using daily averages. Target angle of incidence effects needed to be included. Acceptable accuracy for hydrological modelling required averaging results to an effective resolution of about 20 km, which is appropriate for many water resources applications.

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