MalaGIS

Sharing GIS Technologies, Resources and News.

Yesterday in a technical group, an interesting question arose: How does Leaflet's official website achieve its smooth leaf logo color transition? While initially assuming it was a GIF animation, closer inspection revealed a more elegant solution.

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Air quality monitoring typically generates hourly or daily data, while environmental remote sensing research often requires long-term data aggregation and comparison. This guide provides a programming-free method for researchers to efficiently consolidate and analyze such datasets.

Data Acquisition

Hourly air quality data (AQI, PM~2.5~, PM~10~, SO~2~, NO~2~, O~3~, CO) is available from Wang Xiaolei's authoritative platform:
https://quotsoft.net/air/

Dataset Coverage:

• National monitoring stations (~1,600 sites, primarily urban)

• Beijing municipal stations (35 sites across categories):

  • Urban environmental assessment (12)
  • Suburban environmental assessment (10)
  • Reference/regional sites (7)
  • Traffic pollution monitors (5)

National station distribution

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