Publications

d'Andrimont, R; Defourny, P (2018). Monitoring African water bodies from twice-daily MODIS observation. GISCIENCE & REMOTE SENSING, 55(1), 130-153.

Abstract
Building on the availability of high revisit frequency Earth Observation satellites at medium spatial resolution (250m), this study investigates the feasibility of temporal monitoring of water bodies at a continental scale with MODIS. A 2004-2010 time series of twice-daily observations covering the whole African continent was systematically processed using a surface water detection method to derive 10-day indicators describing the location, the intra- and inter-annual variability as well as the temporal characterization of water bodies (i.e. seasonal or permanent water and maximum extent). The multispectral surface reflectance transformation in the HSV color space allows a per-pixel identification of surface water. The water aggregation time indicator provides the water occurrence for each 10-day period built from the seven years of observations. The cartographic products were successfully cross-validated with already existing maps and water products. The validation of the water body maximum extent map estimates the commission error at less than 6% and the seasonality information was also found to be consistent with the Koppen climatic classification.

DOI:
10.1080/15481603.2017.1366677

ISSN:
1548-1603