Check out a blog post on swimming pool detection and classification done with fellow fastai alumni @divyansh - https://medium.com/geoai/swimming-pool-detection-and-classification-using-deep-learning-aaf4a3a5e652
This work was presented live to over 18,000 GIS professionals at the Esri User Conference in San Diego last week - video at https://www.youtube.com/watch?v=z_CrA2sMPFY
Fastai (the library and the course) was critical to the success of this project - thanks Jeremy and Rachel!