Photogrammetry

Photographic surveying

Photogrammetric survey:

Specialize in the science of obtaining reliable spatial information from photographic images. Photogrammetrists analyze aerial and terrestrial photographs to obtain information about physical objects and the environment. There are also many uses for non-aerial or close-range photogrammetry.

Remote sensing:

As a science exploits, in one way or another, the use of the electromagnetic spectrum to “sense” an object and derive information from it. The field of remote is a relatively young science and covers a very wide field of scientific methods of extracting information from “remotely” sensed data.

Uses:

1. Photogrammetry is used in preparing topographic maps, advantages include.
2. Speed of coverage of an area
3. Relatively low cost
4. Ease of obtaining topographic details
5. Reduce likely wood of omitting date due to tremendous amount of detail shown in photographs.
6. It is used in land surveying to compute co-ordinates of section corner etc.