Surface soil moisture estimation over the AMMA Sahelian site in Mali using ENVISAT/ASAR data

F. Baup; Eric Mougin; P. de Rosnay; F. Timouk; I. Chênerie

Surface soil moisture estimation over the AMMA Sahelian site in Mali using ENVISAT/ASAR data

F. Baup ^{1, *} Eric Mougin ¹ P. de Rosnay ¹ F. Timouk ¹ I. Chênerie ²

* Corresponding author

1 CESBIO - Centre d'études spatiales de la biosphère

2 ADMM

Abstract : This paper focuses on different methods for estimating soil moisture in a Sahelian environment by comparing ENVISAT/ASAR and ground data 10 at the same spatial scale. The analysis is restricted toWide Swath data in order to take advantage of their high temporal repetitivity (about 3–4 days) 11 corresponding to a moderate spatial resolution (150 m). On the one hand, emphasis is put on the characterization of Surface Soil Moisture (SSM) at a 12 spatial scale compatible with the derivation of the backscattering coefficients, and a transfer function is developed for up-scaling local measurements 13 to the 1 kmscale. On the other hand, three different approaches are used to normalize the angular variation of the observed backscattering coefficients. 14 The results show a strong linear relationship between the HH normalized backscattering coefficients and SSM. The best result is obtained when 15 restricting the ASAR data to low incidence angles and by taking into account vegetation effects using multi-angular radar data. For this case, the rms 16 error of the SSM retrieval is 2.8%. These results highlight the capabilities of the ASAR instrument to monitor SSM in a semiarid environment.

Keywords : ENVISAT ASAR Wide Swath Sahel Soil moisture

Document type :

Journal articles

Domain :

Life Sciences [q-bio] / Ecology, environment / Ecosystems

Complete list of metadatas

Cited literature [12 references] Display Hide Download

http://hal.ird.fr/ird-00391966
Contributor : Dominique Bruel <>
Submitted on : Friday, June 5, 2009 - 11:21:46 AM
Last modification on : Thursday, July 25, 2019 - 4:34:09 PM
Long-term archiving on : Thursday, June 10, 2010 - 10:13:34 PM

baup_et_Al_RSE_2007.pdf

Files produced by the author(s)

Surface soil moisture estimation over the AMMA Sahelian site in Mali using ENVISAT/ASAR data

File

Identifiers

Collections

Citation

Export

Metrics

425

379

Contact

Surface soil moisture estimation over the AMMA Sahelian site in Mali using ENVISAT/ASAR data

File

Identifiers

Collections

Citation

Export

Share

Metrics

425

379

Contact