Photographic Surveying - Types & Uses
Photographic surveying also called photograph icing is a method of surveying in which plans or maps are prepared from photographic taken at suitable camera stations or photographic is the science of making measurement from photographs.
Types of Photographic Survey:
Photogrammetry may be divided into two classes.
1. Terrestial or Ground Photogrammetry:
In terrestrial photogrammetry maps are prepared from terrestrial (or ground) photographs or terrestrial photogrammetry employees photograph taken form points on earth surface for measurement purposes.
The terrestrial photographic surveying considered as the further development of plane table surveying.
2. Aerial Photogrammetry:
In aerial photogrammetry maps are produced from air photograph’s (photographs taken form the air)
Photogrammetry in compassed two major areas of specialization.
The first area is of principal interest to surveyor’s since it is applied to determined dittanies elevations areas volumes cress-section’s an to compile topographic maps form measurement made on photographs.
Interpretive photogrammetry involves objects from there photographic images and judging their significances. Critical factors considered in identifying objects of shape, sizes, patterns, shadow.
Uses of Photogrammetry:
Photography dates to 1839.
Evidence that help locate these corners.
A photo theodolite is a form of ground camera. It is a combination of camera and theologize an is used of taking photographic and measuring the angles which the rival plane of collimation makes with base line.
The optical axis of the camera is arrange parallel to the line of collimation of the chocolate telescope and the theologize allows
The determination of the orientation of the camera axis.
The angular measurement needed to fix the camera stations (A and B) during the control survey.