编辑-地球科学江南体育网页版堆栈交换江南电子竞技平台

你不是登录。你的编辑将被放置在一个队列,直到同行评议。

我们欢迎编辑,使读者更容易理解和更有价值。因为社区成员审查编辑,请尽量使文章更好比你怎么发现,例如,通过修正语法或添加额外的资源和超链接。

牧师

从天气雷达地图得到他们的数据在哪里?

我看到地图这一个在线的新闻。一个移动地图显示云层和东西随着时间移动。他们得到的数据在哪里?从一个单一的源位置或多个位置?同时,它是免费的吗?它对公众开放访问吗?

回答

图像显示了云主要来自地球同步卫星。地球同步卫星海拔约36000公里,这允许他们持续的监控地球的同一区域。他们住在赤道的位置相对于地球表面上方由于重力和离心力之间的平衡。有几个这样的卫星指定操作天气预报,特别是:*(东边&去西方)(https://en.wikipedia.org/wiki/Geostationary_Operational_Environmental_Satellite)由(NOAA) (http://www.noaa.gov/) * (Meteosat-7 8 9, -10) (https://en.wikipedia.org/wiki/Meteosat)由(EUMETSAT) (http://www.eumetsat.int) * (MTSAT) (https://en.wikipedia.org/wiki/Multi-Functional_Transport_Satellite)由日本气象厅(日本)这些卫星包含被动遥感仪器测量入射辐射的渠道,主要是可见光和红外线。可见只有白天,而红外是可用的。辐射对传感器的行捕获通过扫描视图,通常需要几分钟才能完成。地球同步卫星无法捕捉极地纬度,超过一定的角度。除了地球同步卫星,有极地轨道气象卫星:* (NOAA-18 -19) (https://en.wikipedia.org/wiki/NOAA-19) * (MetOp-A, - b) (https://en.wikipedia.org/wiki/MetOp) (EUMETSAT)极地卫星飞低得多(约800公里),不能提供连续的全球覆盖率,只有大片沿着自己的轨道。所有这些数据可用于天气预报模型的同化(初始化)过程。反过来,一个能产生图像的云层的输出模型,如见。(wettercentrale.de) (http://www.wetterzentrale.de/topkarten/)。 NASA operates mostly research satellites, not so much operational weather satellites, although they do cooperate with NOAA on some of the missions. In Europe, the counterpart is ESA, who run some satellites on their own (e.g. Sentinel and in the past Envisat and ERS-1,-2) and cooperate with EUMETSAT. The data from satellites is downlinked to communication centers (sometimes routed via other communication satellites), where it is processed by various algorithms into products (data files). Product files can be downloaded over the Internet by national weather services or are made available publicly to anyone (all data from NASA satellites is public - see e.g. [NASA Global Change Master Directory](http://gcmd.nasa.gov/)). Weather radars are generally located on the ground. They operate by sending short pulses of microwave radiation and measuring the reflected (backscattered) radiation from water/ice droplets. As the microwave radiation has relatively large wavelength (on the order of one millimeter), it is not very sensitive to cloud droplets, and you can see mostly bands of precipitation. Weather radars are operated locally by national weather services. You need roughly one per 250 km to get a good coverage. As with data from weather satellites, they are very important in assimilation of numerical weather prediction models. There are also spaceborne radars, e.g. DPR on [GPM Core Observatory](http://www.nasa.gov/mission_pages/GPM/main/index.html), [TRMM](http://trmm.gsfc.nasa.gov/), or [CloudSat](http://www.cloudsat.cira.colostate.edu/).

编辑总结

取消

添加一个评论 |

正确的小错误或错误
澄清的意思,而不更改它
添加相关资源或链接
总是尊重作者的意图
不使用编辑与作者回复

创建代码用引号”或式子~篱笆
' ' '
像这样
' ' '
添加语言标识符来突出显示的代码
”“python
def函数(foo):
打印(foo)
' ' '
把段落之间的回报
在结束linebreak添加2个空间
_italic_或* *的* *
报价将>开始的
做链接(尽量使用https)
< https://example.com >
(例子)(https://example.com)
< a href = " https://example.com " > < / >示例
MathJax方程罪\ \ ^ 2θ美元

格式帮助»
回答帮助»

MathJax帮助»