In order to determine value of scale, value of horizontal distance on ground must be determined it can be given by process of triangulation, as it involves quick output development.

Terrestrial photogrammetry involves two branches which are given as plane-table photogrammetry and terrestrial stereo photogrammetry. These are capable of studying ground from existing maps, and reconnaissance is made through this classifications.

Generation of map requires a photograph with a uniform scale, which is quite simple in case of vertical photograph. So, it is most probably adopted. But, in case of tilted photograph scale is not uniform with consideration of relief. Because of this reason, a combination of vertical and tilted photographs is considered sometimes.

The camera axis provided by camera fitted on tripod will pass through centre of camera lens perpendicular to camera plate and picture plate. This will eliminate all imperfections and errors.

A photo-odolite consists of a camera box with fixed focus, hollow rectangular frame, vertical frame, sensitized photographic plate and a tripod stand. Each of m is having ir own importance.

Overlapping must be done at a desired rate. Excessive overlapping can cause photograph more complex, with which time for obtaining output increases. Frequency of camera must be under control so as to avoid successive overlapping. The percentage of overlapping must be in a range of 55-60 %.

The stereoscope classification generally involves mirror stereoscope and lens stereoscope. Both of m can be employed based on type of material available that is eir a mirror of lens.

The process of finding scale involves joining points of equal elevation. If re is a change in joining points n it might affect scale produced. So, variation of elevation points can cause variation in scale produced.

The flying height can be determined by using formula,
Flying height = contour interval * c-factor. The value of c-factor lies in between 500-1500. On substitution, we get
Flying height = 6*500 = 3000m.

Stereo pairs can be interpreted by using stereoscope, which is designed for assisting and magnifying perception of depth. Stereoscope has been classified as mirror stereoscope and lens stereoscope.