Over the last several years the concept of modelsupported exploitation(MSE) has evolved to a point where relatively simple computer vision algorithms can extract significant intelligence information from aerial images in a robust and reliable manner. Information extraction is enabled by the use of detailed 3D site models which provide an extensive context for the application of image analysis algorithms. This paper reviews the basic MSE concept and illustrates the approach using three operational concepts taken from the RADIUS project, quick-look, detection and counting and focussed change detection. 1 Model supported exploitation 1.1 The site model A project to support increased productivity for image analysts called RADIUS(Research and Development for Image Understanding Systems) has been under development over the last several years. The central concept of RADIUS is model supported exploitation (MSE). In this concept a 3D model is constructed from a number of images of a site. ..