Drones and sonar produced a map accurate to ten centimetres.
Scientists have mapped the Aurel river delta in more detail than ever before, using drones above the water and sonar below it.
The map, accurate to ten centimetres, shows that the delta has moved 300 metres seaward in 50 years, as silt from farmland upstream builds new banks.
The data is free to download, and the team hopes farmers, shipping companies and flood planners will all use it.
Sandbags and pumps are being moved to towns along the coast.
Some farms are switching to crops that ripen faster or cope better with heat.
The buses charge overnight at the Northgate depot, which now has its own solar roof.
The plan aims to shade the hottest streets, where summer temperatures run up to four degrees above the city average.
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