FY-3D/MERSI西伯利亚至堪察加半岛的宽幅真彩色图像
封面图片为风云三号 D 星中分辨率光谱成像仪 (MERSI) 获取的西伯利亚至堪察加半岛的宽幅真彩色图像，图像空间分辨率 250 m，东西幅宽达 2800 km。从图像中能够清晰看到大气中的云，陆面积雪和海冰相互交织奇妙场景，库页岛雪山纹理清晰，海陆交接处浅蓝色海冰在逐渐增长，中分 辨率光谱成像仪 (MERSI) 是风云三号极轨气象卫星关键光学成像仪器，它不仅能获取每日覆盖全球百米级（250 m）空间分辨率真彩色合成图像产品， 并通过对太阳反射波段和红外波段多光谱连续综合观测，实现云气溶胶、水汽、陆地表面特性、海洋水色等大气、陆地、海洋参量的高精度定量反演。MERSI-III 型仪器共设置 25 个观测通道，其中太阳反射波段通道有 19 个，热红外通道有 6 个，25 个通道中 6 个通道具有 250 m 空间分辨率（包 括 2 个长波红外分裂窗通道），其余通道空间分辨率为 1000 m。MERSI-III 每天无缝隙获取全球数据（分白天和夜间模式），白天模式获取可见和红外全部观测通道数据，夜间模式只获取红外通道（≥ 3.7 μm）观测数据。
The true color image from Siberia to Kamchatka by FY-3D/MERSI
The cover image spanning from Siberia to Kamchatka is by FY-3D satellite's Medium Resolution Spectral Imager (MERSI). The image boasts a spatial resolution of 250 m and covers an east-west width of 2800 km. It vividly displays the interplay between clouds in the atmosphere, snow-covered land, and sea ice.The snow-capped mountains on Sakhalin Island exhibit a distinct texture, while the light blue sea ice along the shoreline gradually expands. Medium resolution Spectral Imager (MERSI) is the key optical imaging instrument of FY-3 polar-orbiting meteorological satellite. It can not only obtain true color composite images with spatial resolution 250 m worldwide every day, but also continuously and comprehensively observe the solar reflection band and infrared band through multi-spectrum. High precision quantitative inversion of atmospheric, land and ocean parameters such as cloud aerosol, water vapor, land surface characteristics and ocean water color is realized. MERSI-III instrument is equipped with 25 observation channels, including 19 solar reflective band channels and 6 thermal infrared channels. Among the 25 channels, 6 channels have a spatial resolution of 250 m (including 2 long-wave infrared split window channels), and the remaining channels have a spatial resolution of 1000 m. MERSI-III acquires global data seamlessly every day (day and night modes), with all visible and infrared observation channel data in daytime mode and infrared channel ( ≥ 3.7 μm) observation data only in night mode.
