CARTUS-AML project (Land Use map of Lisbon Metropolitan Area) is based on three general ideas: 1) Land use can express, although partially, the complex relation between Man and Territory; 2) The understanding of this complex relation requires spatial and time referenced information. To understand this complex relation spatial information, that must be time referenced is required; 3) This spatial and time referenced information helps the agents/actors of production and transformation of the metropolitan space, in the decision-making process. These three general ideas admit the measurement of one of the physical dimensions of the metropolitan phenomenon: land use change. This measurement (by surface) consists, basically, on the location and calculation of areas of change and areas that remained unalterable. An idea was developed to yield and produce land use maps using the most evolved tools of spatial data acquisition and management: Remote Sensing (aerial photographs and satellite images) and Geographic Information Systems.