Processing of high resolution satellite data for map updating

The paper addresses the use of high resolution satellite imagery for map updating at technical scale (1:5,000). QuickBird and Ikonos images acquired on a wide portion of the city of Bologna (Italy) were rectified using the available geometric correction models, a Digital Elevation Model of the area and a set of Ground Control Points acquired by GPS survey. Once the reliability of the orthorectification procedure was verified by using a subset of GPS points, an attempt of features extraction was carried out in order to update entities or thematisms of the present-day cartography. An example relative to the road network updating will be discussed