Articles | Volume 13, issue 5
Hydrol. Earth Syst. Sci., 13, 663–674, 2009
https://doi.org/10.5194/hess-13-663-2009

Special issue: Advances in land surface hydrological processes – field...

Hydrol. Earth Syst. Sci., 13, 663–674, 2009
https://doi.org/10.5194/hess-13-663-2009

  27 May 2009

27 May 2009

Physically based retrieval of crop characteristics for improved water use estimates

K. Richter1 and W. J. Timmermans2 K. Richter and W. J. Timmermans
  • 1Department of Agricultural Engineering, University of Naples "Federico II", via Università 100, 80055 Portici (Na), Italy
  • 2International Institute for Geo-information Sciences and Earth Observation, Dept. of Water Resources, P. O. Box 6, 7500 AA Enschede, The Netherlands

Abstract. The increasing scarcity of water from local to global scales requires the efficient monitoring of this valuable resource, especially in the context of a sustainable management in irrigated agriculture. In this study, a two-source energy balance model (TSEB) was applied to the Barrax test site. The inputs of leaf area index (LAI) and fractional vegetation cover (fCover) were estimated from CHRIS imagery by using the traditional scaled NDVI and a look-up table (LUT) inversion approach. The LUT was constructed by using the well established SAILH + PROSPECT radiative transfer model. Simulated fluxes were compared with tower measurements and vegetation characteristics were evaluated with in situ LAI and fCover measurements of a range of crops from the SPARC campaign 2004. Results showed a better retrieval performance for the LUT approach for canopy parameters, affecting flux predictions that were related to land use.