don't compute a water mask when srtm usage is disabled
don't compute a water mask when srtm usage is disabled

mnhrdt/s2p,carlodef/s2p,carlodef/s2p,jmichel-otb/s2p,MISS3D/s2p,MISS3D/s2p,dyoussef/s2p,dyoussef/s2p,jmichel-otb/s2p,dyoussef/s2p,MISS3D/s2p,dyoussef/s2p,jmichel-otb/s2p,MISS3D/s2p,jmichel-otb/s2p,mnhrdt/s2p