Preparation of accurate geological and structural maps, cross-sections or block diagrams from colour slides, using multi-model photogrammetry
Abstract
The multi-model photogrammetric method is a new technique that allows field geologists to make accurate three-dimensional models of their choice using standard colour slides taken with ordinary field cameras. The method greatly expands the geological potential of photogrammetry beyond conventional methods based on vertical aerial photographs or satellite data. A computerized stereoscopic instrument, in which the commercial software is replaced by multi-model software, is used for interpretation. The multi-model technique links a series of stereoscopic images of the same target viewed at different scales, or from different angles, to form one composite three-dimensional model, and permits instantaneous image shifts to be performed during interpretation. The method can be applied to numerous geological situations where accuracy is required, but where access or overview is difficult or impossible; a significant proportion of geological and structural analysis can thus be moved from the field to the laboratory. Examples of geological and structural applications include studies of Tertiary basalts in West Greenland and Precambrian gneisses in South India; the scale of these studies varies from 1:200,000 to 1:25.
- Publication:
-
Journal of Structural Geology
- Pub Date:
- July 1993
- DOI:
- 10.1016/0191-8141(93)90186-E
- Bibcode:
- 1993JSG....15..933D