A method of obtaining a stereoscopic view from two satellite or two aerial photographs (18, 19) of the same or overlapping area. The method involves aligning the photographs (18, 19) in a stereoscope (10) with the horizontal axis (16) of the stereoscope (10) aligned parallel to the flight path taken to produce the photographs (18, 19) or parallel to the scan direction employed by the satellite. The photographs (18, 19) being produced on infra red film in the case of aerial photography or enhanced to accentuate red and infra red in the case of satellite photography. A series of photographs are produced each with a desired color balance. The photographs are cross compared in the stereoscope (10) to produce an enhanced stereoscopic effect to enable detection and/or measurement of structures or effects.
A non destructive method determines the three-dimensional structure of a body opaque to visible light, by means of radiations from a single body, particularly suitable for parts of a reinforced concrete structure, wherein the distance between the source and the sensitive plate is shorter than that of the prior art, and wherein the labor time at the body site is substantially less than that of the prior art. The steps of the method include, essentially, the following steps: making some previous assumptions, such as the circular shape of cross sections of iron rods within the concrete; placing in front of the body a source having a discrete cross section spaced therefrom a distance sufficiently small for producing on the two-dimensional image, apart from shadows, measurable penumbra zones; radiating the body for obtaining a two-dimensional image wherein shadow zones as well as penumbra zones may be distinguished, and quantifying the radiation influencing such zones; applying a method for measuring the radiation influencing the sensitive sheet following a set of parallel straight lines; and calculating by computer mathematical methods the geometrical arrangement on each plane of the different parts and materials.
A system for providing informational data regarding an emergency situation that is accurate and is relatively recent information, which information is referenced to a common database and time-base, so that decision-makers may readily grasp the gravity of the emergency-situation, and react accordingly. The present invention combines the speed and high resolution of electronic imaging with the accuracy of computers to enhance information-flow to emergency-managers. The system of the invention integrates established data-base information, such as those contained in computer-based maps, registered orthophotographs, surveyed information, etc. with high-resolution electronic-imaging to permit a more accurate assessment of current situations. Through the use of the system of the invention, the situation-managers now can view a situation with high resolution, accurate, multi-spectral imaging, in near real-time and display a histogram of change.
