{"refrec":{"BRefID":201513,"RR":"<b>van der Wal, D.; Herman, P.M.J.</b> (2007). Regression-bases synergy of optical, shorwave infrared and microwave remote sensing for monitoring the grain-size of intertidal sediments. <i>Remote Sens. Environ. 111(1)</i>: 89-106. <a href=\"http://dx.doi.org/10.1016/j.rse.2007.03.019\" target=\"_blank\">http://dx.doi.org/10.1016/j.rse.2007.03.019</a>","BEntID":193773,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Remote Sens. Environ. 111(1)</i>: 89-106. <a href=\"http://dx.doi.org/10.1016/j.rse.2007.03.019\" target=\"_blank\">http://dx.doi.org/10.1016/j.rse.2007.03.019</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"van der Wal, D.; Herman, P.M.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"van der Wal, D.; Herman, P.M.J.","Englishabstract":"A method is developed for monitoring the sediment grain-size of intertidal flats in the Westerschelde (southwest Netherlands), using information from both space-borne microwave (SAR) and optical/shortwave infrared remote sensing. Estimates of the backscattering coefficient were extracted from time-series of C-band ERS SAR imagery. Surface reflectance in the visible, near-infrared (VNIR) and shortwave infrared (SWIR) part of the electromagnetic spectrum, as well as spectral indices, were derived from matching multi-temporal Landsat TM imagery. In addition, surface reflectances were derived from a set of airborne multispectral (VNIR) CASI images, and hyperspectral (VNIR) measurements using a field spectroradiometer. The data were related to matching field measurements of surface characteristics, including sediment properties. Regression-based algorithms were developed to map the spatio-temporal distribution of mud content using (a) the C-band SAR backscattering coefficient, (b) surface reflectance in the green and SWIR, and (c) a combination of these, with corroborative field measurements. Mud content of the sediment has been successfully mapped by all three algorithms, but a combination of information from microwave and VNIR/SWIR provided best results. The algorithms were generally consistent in time, making them suitable for generating time-series and for monitoring. 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