天宫二号宽波段成像仪青藏高原专题数据集

Thematic datasets for the Tibetan Plateau from Tiangong-2 wideband imaging spectrometer

青藏高原是世界屋脊、亚洲水塔,是地球第三极,以第三极为起点向西扩展的面积约2000万平方公里的泛第三极地区是“一带一路”核心区。目前我国开展的第二次青藏高原综合科学考察研究将揭示青藏高原环境变化机理,优化生态安全屏障体系,对推动青藏高原可持续发展、推进国家生态文明建设、促进全球生态环境保护具有十分重要的作用。天宫二号宽波段成像仪自2016年9月发射至今,对青藏高原进行了持续观测,获得了大量多时相多谱段遥感数据。经过辐射校正、几何校正、定量反演等处理和质量控制,生产了一批青藏高原专题数据集,通过载人航天空间应用数据推广服务平台(http://www.msadc.cn)进行分发和共享。本数据集包含天宫二号宽波段成像仪发射至今获取的青藏高原地区高质量影像数据及地表反射率、地表温度、地表亮温、归一化植被指数、归一化积雪指数、归一化水体指数专题产品,将为研究该地区土地资源、湖泊水文、生态环境与生物多样性、气候变化、冰川变化等提供丰富的数据资源。

The Tibetan Plateau is known as the ridge of the world,the water tower of Asia,and the third pole of the earth.The Pan-Third Pole region,which extends from the third pole westwards to cover an area of about 20 million km2,constitutes the core area of the“Belt and Road”.The ongoing second comprehensive scientific investigation of the Tibetan Plateau intends to reveal the mechanism of environmental changes and optimize the ecological security barrier system in the Tibetan Plateau.It plays an important role in promoting the sustainable development of the Tibetan Plateau,the construction of national ecological civilization and the protection of global ecological environment.The launch of the Tiangong-2 wide-band imager in September 2016 has enabled a continuous observation of the Tibetan Plateau,which generated a large number of multi-temporal and multi-spectral remote sensing data.On this basis,we built the thematic datasets for the Tibetan Plateau based on a series of data processing and quality control measures,including radiation correction,geometric correction,and quantitative inversion.The datasets were then distributed and shared through the space application data promoting service platform for China Manned Space Engineering(http://www.msadc.cn).The datasets include high-quality image data,surface reflectance products,surface temperature products,surface brightness temperature products,normalized vegetation index products,normalized snow index products and normalized water index products for the Tibetan Plateau acquired by the Tiangong-2 wide-band imaging spectrometer since its launch.It provides rich data for studies of land resources,lake hydrology,ecological environment and biodiversity,climate change,and glacial changes of this region.