Bengaluru's lakes,
measured from space.
Every five days a satellite photographs every lake. We turn the pixels into a health score you can watch change over a decade.
Bellandur Lake
2016 to today
Bellandur, Bengaluru's largest lake, frothing and shrinking across 66 cloud-free satellite passes.
Every lake, at a glance.
Each dot is a real lake, placed where it sits in the city, sized by its water and coloured by its health. The south-east runs red. That is Bellandur and Varthur, where the city's sewage collects.
Who's winning, who's losing.
Five years of change, ranked. Some lakes are quietly recovering. Others are draining away.
Shrinking fastest
Biggest water loss over 5 years
- 1
- 2
- 3
- 4
- 5
Bouncing back
Lakes regaining their water
- 1
- 2
- 3
- 4
- 5
How a pixel becomes a health score.
A satellite passes over
Every 5 days, the European Space Agency's Sentinel-2 photographs Bengaluru at 10-meter resolution. Free, public, no downloads.
We read the water
An index called NDWI separates water from land. A second one flags algae. Clouds get thrown out. Pixels become numbers.
A lake gets a score
Water area, algae, and a decade-long trend fold into one 0 to 100 health score, so a slow decline can't hide.
Find your lake.
Search 176 lakes, watch a decade pass in ten seconds, and share what you find with the people who can fix it.