The Visual and Infrared Multispectral Imager (VIMI), as an important earth observation payload onboard the GF-5 satellite, has the characteristics of broader bands,higher spatial resolution and higher radiometric calibration precision. The imager has an eight-year design life and operates in a push-boom imaging fashion to acquire earth data from 0.45μm to12.5μm over 60km swath. The nadir spatial resolution is 20m and the absolute radiometric calibration precision is less than 5% for reflected solar bands(B1-B6). For thermal emissive bands(B7-B12), the nadir spatial resolution is 40m and the absolute radiometric calibration precision is less than 1K@300K. Thanks to the high integration of the imager, and the advanced technical indexes, China's multi-spectral optical remote sensor has been greatly improved in the spectral number, spatial resolution, radiation resolution, and radiation calibration accuracy. In this paper, the comparison of indexes at home and abroad, the technical characteristics and the advanced design of VIMI are introduced. Finally, the application direction is discussed.%全谱段光谱成像仪是"高分五号"卫星上的一个重要的对地观测有效载荷,具有谱段多、空间分辨率高、辐射定标精度高的特点.载荷设计寿命8年,以60km幅宽、推扫成像方式,获取地球表面 0.45~12.5μm 谱段范围的辐射数据.可见近红外短波谱段(B1-B6)星下点空间分辨率 20m,绝对辐射定标精度 5%;中长波红外谱段(B7-B12)星下点空间分辨率 40m,绝对辐射定标精度 1K(300K时).该载荷集成度高、技术指标先进,使中国多光谱光学遥感器在谱段数量、空间分辨率、辐射分辨率和辐射定标精度上都有了大幅提升.文章对载荷的方案、技术特点和先进性等进行了介绍,并对后续的应用方向进行了展望.
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