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微信启动图片“变脸” 背后的故事门道有很多

2017-09-26 02:31:52   中国青年网

其实,这正是向祖国取得重大科技成就的一次献礼。9月25日至9月28日期间,大家在微信启动的时候,都能欣赏到 “风云四号”从太空拍摄的祖国全景。

不仅如此,微信团队还首次披露了微信启动页背后的故事。

微信一直以来的启动页中,选用的照片素材是NASA在全世界范围公开的第一张完整的地球照片,名为“蓝色弹珠”,这是人类第一次从太空中看到地球的全貌。画面中所显示的是非洲大陆。

关于选用这张照片作为素材的原因,微信团队透露称:“非洲大陆是人类文明的起源地,我们将非洲上空的云图作为启动页的背景图,也希望将‘起源’之意赋予启动页面。

而此次展示‘风云四号’拍摄画面,也是寓意从‘人类起源’到‘华夏文明’的历史发展,旨在向亿万微信用户展示我国大好河山风貌。

成效

风云四号很牛,但这并不是终点,而是一系列创新技术应用中的一部分。

截至目前,我国8颗风云气象卫星在轨运行,其中用于业务运行的有6颗。风云系列气象卫星为81个国家和地区的用户提供高时效的气象卫星数据,并覆盖“一带一路”沿线的37个国家和地区,被广泛应用于气象预报、防灾减灾、科学研究等领域。

十八大以来,2013年9月23日,风云三号C星发射成功;2014年12月31日,风云二号G星发射成功;2016年12月11日风云四号A星发射成功。配合此前业务运行的四颗风云系列气象卫星,成功实现由试验业务型向应用服务型转变,为各项气象工作提供了不可或缺的观测依据。

风云二号实现了6分钟的高频次区域观测新业务能力,使得我国静止卫星及仪器设计在与国际水平相差一代(约20年)差距的前提下,观测时效接近国外现役静止轨道业务卫星。

风云三号C星是我国第二代极轨气象卫星中第一颗业务卫星,其投入业务运行后,与风云三号B星一起形成上、下午星组网观测,实现了全球、全天候、多光谱、三维、定量对地遥感探测,确保我国极轨气象卫星业务的连续稳定运行。

而风云四号A星第一阶段在轨测试圆满完成,其各项功能、性能指标符合研制总要求已具备在轨交付条件。前面已经提到,这是我国首颗静止轨道上三轴稳定的定量遥感卫星,其扫描成像辐射计可见光通道最高空间分辨率达到500米,可每15分钟对东半球扫描一次,最快每1分钟生成一次区域观测图像;搭载了世界首个静止轨道干涉式大气垂直探测仪,首次实现了静止轨道大气高精度温度、湿度廓线探测;首次实现了我国静止轨道闪电成像观测,可对我国及周边区域闪电每秒拍摄500张照片。

值得一提的是,风云四号A星成功解决了多台带有光学运动部件的观测仪器在同一平台上工作而不相互干扰的工程技术难题,目前欧洲仍采用两台主要仪器且分置于两颗卫星上的方案。风云四号A星是所有静止气象卫星中装载仪器最多的一颗,单颗卫星的观测能力和效率大为提高。

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