VDM is a generic term to refer to visual data exploration tools, which allows interactive data presentation in order to increase users' capabilities to understand the information content of large data sets of images and extract meaningful, relevant semantic clusters, together with quantitative measurements presented in a suggestive, visual way.

The VDM tools are able to offer a preliminary insight into a set of optical or radar data, by revealing its semantic structure (natural groups/clusters of resembling scenes/tiles) and some quantitative estimations regarding that structure, through suggestive, simple visual representations. Based on VDM maps, charts and diagrams, the user can make better and faster a priori estimations on the feasibility of the desired image processing.