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Remote Sens. 2012, 4(9), 2635-2660; doi:10.3390/rs4092635

Flux Measurements in Cairo. Part 2: On the Determination of the Spatial Radiation and Energy Balance Using ASTER Satellite Data

Institute of Meteorology, Climatology and Remote Sensing, Department of Environmental Sciences, University of Basel, Klingelbergstrasse 27, CH-4056 Basel, Switzerland
Current Address: Department of Remote Sensing, Institute of Geography, University of Wuerzburg, Campus Hubland Nord -86-, D-97074 Wuerzburg, Germany
Author to whom correspondence should be addressed.
Received: 18 June 2012 / Revised: 3 September 2012 / Accepted: 5 September 2012 / Published: 13 September 2012
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This study highlights the possibilities and constraints of determining instantaneous spatial surface radiation and land heat fluxes from satellite images in a heterogeneous urban area and its agricultural and natural surroundings. Net radiation was determined using ASTER satellite data and MODTRAN radiative transfer calculations. The soil heat flux was estimated with two empirical methods using radiative terms and vegetation indices. The turbulent heat fluxes finally were determined with the LUMPS (Local-Scale Urban Meteorological Parameterization Scheme) and the ARM (Aerodynamic Resistance Method) method. Results were compared to in situ measured ground data. The performance of the atmospheric correction was found to be crucial for the estimation of the radiation balance and thereafter the heat fluxes. The soil heat flux could be modeled satisfactorily by both of the applied approaches. The LUMPS method, for the turbulent fluxes, appeals by its simplicity. However, a correct spatial estimation of associated parameters could not always be achieved. The ARM method showed the better spatial results for the turbulent heat fluxes. In comparison with the in situ measurements however, the LUMPS approach rendered the better results than the ARM method. View Full-Text
Keywords: energy balance; radiation fluxes; turbulent heat fluxes; remote sensing energy balance; radiation fluxes; turbulent heat fluxes; remote sensing

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Frey, C.M.; Parlow, E. Flux Measurements in Cairo. Part 2: On the Determination of the Spatial Radiation and Energy Balance Using ASTER Satellite Data. Remote Sens. 2012, 4, 2635-2660.

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