Using #Sepal.io to look at #NDVI values for two plots of land over decades. One is a pond that appears to be covered in algae - I expect the green to come and go with the seasons. The other is a plot that I know has been under construction for years - I expect a sudden drop when the land was cleared.
More about Sepal: https://www.eco-business.com/news/how-better-access-to-satellite-imagery-is-helping-fight-deforestation/