| Sonar surveying is the counterpart of photogrammetric mapping of the land surface. |
| These data have been produced by photogrammetric methods and by scanning, tagging, vectorizing, and gridding of hypsographic map separates. |
| Digital photogrammetric systems enable stereo viewing to be done on a computer screen using a system of optics and digital stereo images. |
| High above the visitors' heads hang large-scale photogrammetric photographs. |
| Some local highway departments have their own photogrammetric units to provide or supplement such productions. |
| Most topographic maps are made using photogrammetric techniques and aerial photographs. |
