MODIS and Sentinal-5 satellite data are used to identify air quality of a particular area.
well that is easy go to ESA's Sentinel-5P TROPOMI Level 2 geophysical products and algorithms
https://sentinel.esa.int/web/sentinel/technical-guides/sentinel-5p/products-algorithm
you can find details about every product extracted from this Sat. related to air quality such as Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), Carbon Monoxide (CO), Methane (CH4), Formaldehyde (HCHO), and Aerosol index.
Moreover for details on how to apply this to GE send your question to [email protected]
If you are looking for air quality data in GEE, it is best to use Sentinel-5 data with a resolution of about 1x1 km.
Sentinel-5 air quality datasets available from GEE can be found here: https://developers.google.com/earth-engine/datasets/tags/air-quality
There is a sample code in the GEE documentation for almost every dataset - mostly about how to add data to GEE and visualize it. You can find a tutorial for exporting images here: https://developers.google.com/earth-engine/guides/exporting.
I am sending a GEE example to add, visualize and download a Sentinel-5 Carbon Monoxide image - it represents average values from the last 7 days (click RUN on the Tasks panel to save the image to your Google Drive):
https://code.earthengine.google.com/a2c98dd50bece54606e9fa2def30e9d3
Various MODIS datasets are also available in GEE. I think this dataset should be useful for your needs (but with a poor resolution of about 111x111km): https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MOD08_M3#description
You can find a description of the bands here: https://developers.google.com/earth-engine/MOD08_bands.html
GEE example for MODIS data:
https://code.earthengine.google.com/86adef0e3a8c0ad3c4f0ffcaccb9a6e9
Daniel Paluba How can I extract data from the downloaded .tiff file image from satellite of a certain location? I have used matlab but I wanted to do this with arcmap. Thanks in advance.
Dear Khalid Hasan Raby, in ArcMap or ArcGIS Pro you can use functions such as "Extract values to a table" or "Extract values to points".
This is also possible in the GEE environment using reducers. These might be useful:
https://developers.google.com/earth-engine/guides/reducers_reduce_region
https://developers.google.com/earth-engine/guides/reducers_reduce_regions
Example in GEE - from line 26: https://code.earthengine.google.com/9d21f116813cc9e28ddfa093cb336647
#######################################################
var imageCollection = ee.ImageCollection("COPERNICUS/S5P/OFFL/L3_NO2");
var geometry = ee.Geometry.Polygon(
[[[76.90591010292432, 28.912627365151685],
[76.90591010292432, 28.32434065943296],
[77.60903510292432, 28.32434065943296],
[77.60903510292432, 28.912627365151685]]], null, false);
var filteredImages = imageCollection.filterDate("2020-01-01","2020-03-31").filterBounds(geometry);
var clipImages = filteredImages.map(function(x){
return x.clip(geometry);
});
print(clipImages);
Map.addLayer(clipImages.select('tropospheric_NO2_column_number_density'), {min:-0.0003,max:0.0004,palette:["Green","Red"]}, 'NOx');
var image = clipImages.select('tropospheric_NO2_column_number_density').toBands(); // Convert all the images into bands and download whole data as single image file
Export.image.toDrive({image:image, description:'Sentinel_NOx_Year2018', folder:'Sentinel5Exports', region:geometry, scale:1000, maxPixels:1e13});
#####################################################
Assuming you are looking for tropospheric NO2 over a region given by geometry var. Though, it is not the best way get the data, since there might be missing data and you might want to take a median/mosaic. But at least you can try above code.
Change ee.geometry.Polygon with coordinates of your region and date as per your requirement.
Dharmendra Singh
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