Air pollution gas satellite data download tutorial

The main gases that affect air quality are ： Sulfur dioxide 、 carbon monoxide 、 Nitrogen dioxide 、 Inhalable particles, ozone, etc . We can go through Giovanni The platform downloads the satellite product data of air pollution gases .

Giovanni Platform is introduced

Giovanni, yes NASA Its geoscience visualization tool . Through simple operation , Can be NASA The data on relevant satellites are counted 、 Display and download .

Supported data include but are not limited to

The atmosphere ： Aerosol index 、 pressure 、 Carbon dioxide 、 carbon monoxide 、 Nitrogen dioxide 、 Inhalable particles 、 ozone 、 Atmospheric moisture 、 Sulfur dioxide, etc .

soil ： Soil temperature 、 Soil moisture, etc .

other ： Vegetation index 、 Phytoplankton quantity 、 The wind speed 、 cloudiness 、 Surface runoff 、 Heat flux 、 Transpiration, etc .

Data download

Data download address ：https://giovanni.gsfc.nasa.gov, Open the web page first , A pop-up window will appear , Click on login Sign in ：

Then you will enter a login interface , Fill in here NASA Account number .

without NASA account number , Need to register a . If it's too much trouble , You can use the public account I created ：ruiduobao, password ：Ruiduobao123

After logging in, enter the data selection and download interface , There are four places to choose ：

First of all Data mapping method , Here is mainly used for the data of the research time range Which way Carry out statistics and mapping , There are time average graphs available 、 Time series animation, etc . Select as needed , It is usually in the form of a time average graph ：

The choice of time depends on your own needs , We need to count the study area 2021 Data of recent months in . The selection of study area is to draw on the map ：

Finally, the selection of data sets , It can be divided into data categories 、 Sensor platform 、 Spatial resolution, etc , Select specific data . For example, I want to use ozone data , You can select... From the search bar or the resource bar on the left ：

Checking the selected data indicates that , Then click... In the lower left corner of the window Plot data Statistics and mapping of data ：

Wait for the data to be counted , After the statistics are completed, the drawing will be carried out on the web page ：

Wait for the data to load , You can make relevant maps online , There are many drawing methods to choose from ：

If local processing is required , Click on download It can be downloaded tiff image ：

Data processing

The data download is completed , Load into arcgis To see ：

From this we get 2021 year 1 month -11 Regional ozone distribution map of China in July , The original resolution is 0.5 x 0.625 degree , Each grid is approximately 60 About kilometers , Considering the low resolution , The premise of using this data is a large study area ：

After downloading the data , If you want to crop the data , Need to use ENVI. If you use arcgis Tailoring , You need to convert the data into another grid first , Otherwise cropping will fail ：

After cutting , The ozone distribution map in China can be obtained ：

We can also use Re interpolation Methods , Reduce the size of grid cells （ Refer to meteorological data CRU TS Use ）. But we need to pay attention , This practice and No real resolution improvement , Just improve the display effect ：

Download and preprocess video

Considering the limitations of words , I made a video for downloading and using air pollution data ：

At the end

NASA Of Giovanni The platform provides a lot of gas related data , And Online Statistics 、 Drawing and downloading .

Limited by the editor's level , No more introductions .
View more data tutorials , have access to “ Remote sensing geoscience data collection ”：

https://www.gisrsdata.com

Reference resources

https://giovanni.gsfc.nasa.gov/

https://giovanni.gsfc.nasa.gov/giovanni/doc/UsersManualworkingdocument.docx.html#h.765ut7soz9is