IMOS - Satellite Remote Sensing - MODIS - 01 day - Optical Water Type (Moore et al 2009 algorithm)

The Aqua satellite platform carries a MODIS sensor that observes sunlight reflected from within the ocean surface layer at multiple wavelengths. These measurements at discrete wavelengths represent the spectrum of light leaving the water surface, and the shape of the spectrum is characteristic of the water optical properties.

Moore et al. (2009) applied a clustering technique to spectra to identify 8 sets of discrete optical water types. This product "owt_csiro" is produced using a CSIRO implementation of the Moore et al. algorithm, and testing shows that it closely reproduces the results of the original Moore et al implementation in the NASA SeaDAS package. The CSIRO implementation was created because the implementation in SeaDAS has not been kept up to date, and to extend the product to the VIIRS sensor.

roduction of contemporary MODIS data ceased at 2024/12/26. Users requiring similar Ocean Colour Radiometry data beyond 2024 should consider the VIIRS instruments on the SNPP and NOAA20+ series of satellites, also provided by IMOS.

Aqua卫星平台搭载中分辨率成像光谱仪（MODIS），该传感器可在多个波长下观测海洋表层内反射的太阳光。这些离散波长下的测量值表征了离开水表面的光的光谱，而该光谱的形状是水体光学特性的特征。

Moore等人（2009年）将聚类技术应用于光谱数据，以识别出8类离散的光学水体类型。本产品"owt_csiro"采用联邦科学与工业研究组织（CSIRO）实现的Moore等人算法生成，测试结果表明，其可高度复现NASA SeaDAS软件包中原始Moore等人算法实现的输出结果。开发CSIRO的实现版本，一方面是由于SeaDAS中的实现版本未得到持续更新，另一方面也是为了将该产品拓展至可见光红外成像辐射仪（VIIRS）传感器。

当前MODIS数据的生产工作已于2024年12月26日终止。对于2024年之后仍需同类海洋色度辐射测量数据的用户，可考虑使用由集成海洋观测系统（IMOS）提供的、搭载于SNPP卫星及NOAA20+系列卫星上的VIIRS传感器数据。