And third summer view
![Image](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3bJttwDGPqhaOXGhfP8XMajlUT5tU2a_8uxlATEl-sQGVUC-u2kJCeiddBVPllAWxZOHliL4NZJQB-sFrWbTx3yVoZQcsLA9hIn6IVJZpc3O1LRjwKsCMCr7XM3K71kx3uI-ICoDgf5Y/w640-h400/EstajaoBars_p25_GSDp037.png)
To finish this summer compilation, a few numbers to highlight how feasible is to track the evolution of a meander: for a pilot case 10 Hectares surface, 15 mins drone footage in manual mode can take 200 snapshots, and after 2 hours SfM crunching by a desktop, a 3D surface model with centimetrical pixel resolution (GSD < 5 cms) allows to track standard fluvial shapes: bars, channels and other deposits that identify meander migrations. More details discussed in the next season E-Learning module.