Vishal Jaiswal has been flying drones since he was young.
Now 27, that childhood hobby has become his profession. A recent project involved mapping part of the Sundarbans, a vast area of mangrove forests where the waters of the Ganges, Brahmaputra and Meghna rivers spill into the Bay of Bengal.
Covering more than 4,000 sq miles (10,360 sq km) of coastal India and Bangladesh, it is the world’s biggest area of mangroves.
“It’s a very dense area with mix of everything, including forests with wild animals,” says Mr Jaiswal.
Along with two other team members he mapped 150 sq km in three days.
“A trained and skilled person is needed to fly a drone in thick mangroves area,” he says.
“It was a difficult task. We mapped the area from deep inside the forest, travelling there on boats and roads.”
It was one of many projects aimed at protecting the mangrove forest from the effects of climate change and human activities.
Globally, more than half of all mangrove ecosystems are at risk of collapse by 2050, according to a recent report, external from the International Union for Conservation of Nature (IUCN).
“Mangroves are threatened by deforestation, development, pollution, and dam construction, but the risk to these ecosystems is increasing due to sea-level rise and the increased frequency of severe storms associated with climate change,” the report said.
In India the picture is mixed.
The mangroves of South India, Sri Lanka and Maldives are “critically endangered,” according to the IUCN report, external.
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