These competitions have closed, however the site is still working.
Owing to the importance of global land cover in disciplines such as climate change, food security and land-use modelling, the creation of a global land cover calibration and validation dataset is essential. To help us achieve this goal, we have established a global sample of validation points which we want you to classify in these competitions. You will be presented with pixels overlaid on satellite images and we would like you to tell us what land cover types you can see up to a maximum of three classes. As most pixels contain multiple land cover types, this will provide us with valuable information for future validation of land cover maps and to get a better understanding on how much people have modified the landscape.Competition Instructions