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Compilation and validation of SAR and optical data products for a complete and global map of inland/ocean water tailored to the climate modeling community
Lamarche, C.; Santoro, M.; Bontemps, S.; d'Andrimont, R.; Radoux, J.; Giustarini, L.; Brockmann, C.; Wevers, J.; Defourny, P.; Arino, O. (2017). Compilation and validation of SAR and optical data products for a complete and global map of inland/ocean water tailored to the climate modeling community. Remote Sens. 9(1): 20 pp. https://dx.doi.org/10.3390/rs9010036
In: Remote Sensing. MDPI: Basel. ISSN 2072-4292; e-ISSN 2072-4292, more
Peer reviewed article  

Available in  Authors 

Keywords
    Marine/Coastal; Brackish water; Fresh water
Author keywords
    water; global; complete; compilation; accuracy; validation; stratifiedrandom sampling; marginal class; Climate Change Initiative; climatemodeling community

Authors  Top 
  • Lamarche, C., more
  • Santoro, M.
  • Bontemps, S., more
  • d'Andrimont, R., more
  • Radoux, J., more
  • Giustarini, L.
  • Brockmann, C.
  • Wevers, J.
  • Defourny, P., more
  • Arino, O.

Abstract
    Accurate maps of surface water extent are of paramount importance for water management, satellite data processing and climate modeling. Several maps of water bodies based on remote sensing data have been released during the last decade. Nonetheless, none has a truly (90°N/90°S) global coverage while being thoroughly validated. This paper describes a global, spatially-complete (void-free) and accurate mask of inland/ocean water for the 2000–2012 period, built in the framework of the European Space Agency (ESA) Climate Change Initiative (CCI). This map results from the synergistic combination of multiple individual SAR and optical water body and auxiliary datasets. A key aspect of this work is the original and rigorous stratified random sampling designed for the quality assessment of binary classifications where one class is marginally distributed. Input and consolidated products were assessed qualitatively and quantitatively against a reference validation database of 2110 samples spread throughout the globe. Using all samples, overall accuracy was always very high among all products, between 98% and 100%. The CCI global map of open water bodies provided the best water class representation (F-score of 89%) compared to its constitutive inputs. When focusing on the challenging areas for water bodies’ mapping, such as shorelines, lakes and river banks, all products yielded substantially lower accuracy figures with overall accuracies ranging between 74% and 89%. The inland water area of the CCI global map of open water bodies was estimated to be 3.17 million km2 ± 0.24 million km2. The dataset is freely available through the ESA CCI Land Cover viewer.

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