PRESENTATION BASED ON DETAILED INFORMATION ABOUT PHOTOGRAMMETRY ONE OF THE IMPORTANT TOPICS OF SURVEYING.

1. Ground
Photogrammetry
NAME : PRAJWAL DESHMUKH 51

2. DEFINITION & HISTORY
 Photographic surveying also called photograph icing is a method of
surveying in which plans or maps are prepared from photograph taken at
suitable camera stations .
 PHOTOGRAPHIC SURVEY is the science of making measurement from
photographs.
 In 1849, Aim Laussedat (April 19, 1819 - March 18, 1907) was the first person
to use terrestrial photographs for topographic map compilation. He is referred
to as the "Father of Photogrammetry".
 At the Paris Exposition in 1867, Laussedat exhibited the first known
phototheodolite and his plan of Paris derived from his photographic surveys.
 Photogrammetry is of two types :
1. Aerial Photogrammetry 2.Terrestrial Photogrammetry

3.  Terrestrial Photogrammetry
 In this kind of photogrammetry, a camera is used in a stationary position.
The camera is positioned on an elevated level. The tilt and other
specifications of the camera are all controlled.
 The Concept of Triangulation is used.
 The line considered which is used for measurement is called as camera
axis..
 Reality Capture is the software used mainly for GROUND
PHOTOGRAMMETRY.

4. Advantages
 High resolution (depending on the survey parameters adopted)
 High precision (centimeter)
 Easy and fast data acquisition
 Object size range: cm-km
 Possibility to get data on subvertical or overhanging rock walls
 Low cost in comparison with other techniques (any calibrated high
resolution camera with interchangeable optics)
 Easy transportability on site

5. Disadvantages
 Data processing is fairly long and complex
 Highly specific software's and operator's expertise
 Need a good visibility of the object (no cloud between the camera and the
object, no trees nor dense vegetation);
 Resolution and precision strongly influenced by the geometry of the
survey (camera positions, distance from the object)
 Measurement of control points rather difficult in some cases

6. APPLICATIONS
 Photogrammetry is used in fields such as topographic mapping,
architecture, engineering, manufacturing, quality control, police
investigation, cultural heritage, and geology.
 Archaeologists use it to quickly produce plans of large or complex sites,
and meteorologists use it to determine the wind speed of tornados when
objective weather data cannot be obtained.
 Mapping :Photomapping is the process of making a map with
"cartographic enhancements“ that have been drawn from a photomosaic
that is "a composite photographic image of the ground " or more precisely
as a controlled photomosaic where "individual photographs are rectified
for tilt and brought to a common scale.

7. Thanks