Fig. 1
From: A crowdsourced global data set for validating built-up surface layers

Screenshot from the Geo-Wiki Global Built-up Surface Validation branch showing an example of the data collection screen for built-up surfaces.
From: A crowdsourced global data set for validating built-up surface layers
Screenshot from the Geo-Wiki Global Built-up Surface Validation branch showing an example of the data collection screen for built-up surfaces.