[en] The Belgian Crop Growth Monitoring System (B-CGMS) uses the 1km²-resolution imagery of NOAA-AVHRR and SPOT-VEGETATION to improve its yield estimates. The pre-processed images are converted to fAPAR and combined with meteorological data (irradiance, temperature) to daily growth values by means of the Monteith approach. The regional means of the cumulative monthly growth numbers are calibrated against official harvest statistics by means of crop-specific neural networks. The quality of the yield estimates varies with the importance of the crop: the R²-values for winter wheat, sugar-beets and fodder maize are respectively 60%, 48% and 36%. The final yield forecasts will be better, because the B-CGMS integrates the image-based yield estimates with the assessments of the agromet-model and of the technological trend function. The technique of linear unmixing seems promising but in its actual state it is too unpredictable to be included in an operational scheme.
Disciplines :
Agriculture & agronomy
Author, co-author :
Eerens, Herman
Wouters, Katy
Dehem, Didier
Tychon, Bernard ; Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Département des sciences et gestion de l'environnement
Buffet, D.
Oger, Robert ; Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Département des sciences et gestion de l'environnement
Language :
English
Title :
Use of medium-resolution imagery in the Belgian crop growth monitoring system (B-CGMS).
Publication date :
2000
Event name :
Vegetation 2000 2 years of operation to prepare the future.
Event place :
Lake Maggiore, Italy
Event date :
du 3 avril 2000 au 6 avril 2000
Audience :
International
Main work title :
Proceedings of Vegetation 2000 : 2 years of operation to prepare the future, Lake Maggiore - Italy - 3-6 April 2000
