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卫星遥感数据是研究大气物种空间分布和时空变化的有力工具。__Aura__是美国国家航空航天局的一颗卫星，在拉丁语中字面意思是大气。__OMI__，意思是臭氧监测仪有$\ce{O3}$， $\ce{NO2}$， $\ce{BrO}$等全球观测数据。从[TEMIS](http://www.temis.nl/airpollution/no2col/no2regioomimonth_v2.php)获得$\ce{NO2}$月平均数据，ESRI网格格式文件由我绘制，显示在这里:[!我注意到这些人物被离散的丝状辫子覆盖着(在我的图中，它们被绘制成绿色，就像下雨一样)，像这样:[!]依我之见，这些辫子一定与人为排放无关，而是与卫星轨道有关。在对某些网格箱的定量研究中，这些编织会影响有限柱浓度。此外，来自NASA Giovanni在线可视化工具，下图也是同一区域的$\ce{NO2}$对流层柱。[！[更多卫星数据]没有像我这样的丝质辫子。所以，我的问题是:__如何为更精确的数据__删除这些异常值。如果有熟悉这一领域的人给我一些建议就太好了。 ### Update Thanks for @deneil's attention. I presented two data source here for distinguishing. 1. TEMIS data was called _Dutch OMI NO<sub>2</sub> (DOMINO) data product v2.0_. In its official manual [here](http://www.temis.nl/docs/OMI_NO2_HE5_2.0_2011.pdf), it said, I quoted: - __DOMINO = Level 2 product__ The DOMINO data contains geolocated column integrated $\ce{NO2}$ concentrations, or $\ce{NO2}$ columns (in units of molecules/cm2). DOMINO data constitute a pure Level 2 product, i.e. - it provides geophysical information for each and every ground pixel observed by the instrument, without the additional binning, averaging or gridding typically applied for Level 3 data. 2. The Giovanni visualization tool use OMI/Aura $\ce{NO2}$ Cloud-Screened Total and Tropospheric Column Daily L3 Global 0.25deg Lat/Lon Grid which means it's level 3 data. I think the difference sitting there. But I have also tried OMI $\ce{NO2}$ level2 data from NASA (OMI has two independent data source in Dutch and NASA), it has 15 candidate scenes which was plotted different from the TEMIS DUMNO2 data. Here is an example. The figure below plot the level 2 data in tilted grid due to the satellite orbits. Level 3 data must resample the tilted grid data into regular grid network. So, I think my first figure shows the right result as level 2 data's character. [![A satellite image][4]][4] ### Updated II There are three different source for tropospheric $\ce{NO2}$ column. It seems that Berkely's dataset is the best choice. [![enter image description here][5]][5] [1]: http://i.stack.imgur.com/1CtFh.png [2]: http://i.stack.imgur.com/RppOR.png [3]: http://i.stack.imgur.com/kVqw6.png [4]: http://i.stack.imgur.com/mn83h.png [5]: http://i.stack.imgur.com/o9bm7.png

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\ begingroup美元两幅图都是基于完全相同的数据?或者可能是NAS乔瓦尼图是基于进一步处理的数据? \ endgroup美元
- - - - - -daniel.heydebreck
2016年6月17日11:19
\ begingroup美元抱歉回复晚了。我检查了这两个数据源荷兰OMI NO2 (DOMINO)数据产品v2.0和GES_DISC_OMNO2d_V003(对流层柱每日L3全球0.25°纬度格网) \ endgroup美元
- - - - - -汉Zhengzu
2016年6月17日15:33

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