This paper presents an overview of current developments in the airborne digital imaging technologies—including both digital frame cameras and pushbroom line scanners—and analyses them in the context of their applications to digital photogrammetry.
Prospective customers often request information on the accuracy of digital photogrammetry. Suitable data have been scarce, so Leica has begun a programme of internal tests. These are neither comprehensive nor necessarily representative of other suppliers' equipment, but several experienced operators and sets of imagery are being used and the results do provide general guidelines. A selection of analogue, analytical and digital workstations is being tested, together with scanners giving different pixel sizes. The early stages of the work are reported here. The tests include interior and exterior orientation of individual stereomodels followed by measurement of check points. Subsequent stages, covering DTMs, orthophotographs, mosaics and aerial triangulation, are planned.
Revision has become a task equallj, as important as new mapping. Photogrammetric methods, however, have developed around the latter rather than the former. Modern instrumentation rejects this growth process. This paper examines the eficacy of various photogrammetric approaches for revision with respect to both detection and plotting of change.
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