Understanding Air-Pollution in Indian Cities using Satellite Imagery

Gokulavasan Murali

gok03.com/air-pollution

Motivation

Gokul

gok03.com

- (Urban + Mobility) enthusiast

- Co-Founded Flytta, Exited July'19

- Community Person!

We will talk about

• Air pollution
• GIS
• Satellite Imagery
• EO-Learn 
• Air pollution Monitor
• Pollution pre+post Diwali

Air Pollution

What is it?

Various gases into the atmosphere -

that cannot be absorbed in the environment.

It Consists of 

• Sulfur dioxide -SO2
• Nitrogen dioxide - NO2
• Carbon monoxide - CO
• Ozone - O3
• Particulate matter -  Aerosols

National Air Quality Index - Swachh Bharat Abhiyan (2014)

GIS

Geographic Information System

Used for

• Urban Planning
  • New public system/ Traffic congestion /  Mapping / Navigation
• Resource Management

  • Maintaining agricultural, water, forest and other resources

• Disaster Management
  • Risk management and analysis / Plan rescue & relief operations

GIS python Tools

• Geopandas
• Shapely
• GDAL
• PyProj
• Sentinelsat
• EO-Learn

Notebook

1.GIS-Intro.ipynb

Satellite Imagery

What is it?

Records the wavelengths emitted from their point of focus.

This includes R/G/B, SWIR , NIR

Each Satellite has different levels of Processing

We can get RGB, NDVI, NDWI, Elevation, Gases Concentration

Some Examples

Some Examples

How to access them?

You look out for

• Spatial Resolution
• Satellite and Product availability
• And free credits sometime!

Sentinel Hub

CLOUD API FOR SATELLITE IMAGERY

EO-Learn

Earth observation processing framework

Notebook

2.EO-Learn-Intro.ipynb

Air pollution using satellite Images

Satellite missions devoted to monitoring our atmosphere

• European Space Agency (ESA)’s Envisat
• NASA’s Aura missions
• Sensors: MODIS, MISR, OMI, and VIIRS
• Sentinel 5P

Sentinel 5p

• Contains TROPOspheric Monitoring Instrument (TROPOMI)
• Uses ultraviolet (UV), visible (VIS), near (NIR) and short-wavelength infrared (SWIR)  -  monitors ozone, methane, formaldehyde, aerosol, carbon monoxide, NO2 and SO2 in the atmosphere

Notebook

3.AP-AQI.ipynb

4.AP-Visualize.ipynb

Diwali
26,27 October
 

Diwali <=> Pollution

Notebook

5.AP-Compare_Diwali.ipynb

Satellite Imagery > Ground based Senors

for Air Pollution Monitoring

Operational monitor (as of 2017)

Notebook

6.Random-Area-AQI.ipynb

Questions!

gok03.com/air-pollution