We report the world's first all-season training and validation sample sets for global land
cover classification with Landsat-8 data. Prior to this, such samples were only available at a
single date primarily from the growing season. It is unknown how much limitation such a
single-date sample has to mapping global land cover in other seasons of the year. To
answer this question, we selected available Landsat-8 images from four seasons and
collected training and validation samples from them. We compared the performances of …