Floating invasive aquatic weeds can rapidly clog up lakes, reservoirs and navigation canals, leading to major economic impacts for businesses, fisheries and leisure activities. Their growth and spread is problematic in fresh waters across the globe, but particularly in tropical and sub-tropical regions.
As free-floating weeds can move rapidly, pushed by winds and currents, providing a frequent and complete picture of their coverage across waterbodies is key to inform boat access, target weed control programmes, and provide early warning of weed problems in new locations.
Currently, surveys are carried out from boats or helicopters which can be expensive and are limited in coverage and frequency.