Learn and get aware about the role of Photogrammetry in GIS. How it provides a general framework for describing what Photogrammetry is, how it can be useful in GIS by making use of photographs to study the areas and give the quantitative measures of the photographed area.

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How is Photogrammetry useful
in GIS
(Geographic Information
Systems)

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Geographic Information System (GIS)
• Geographic Information System is the one in which geographic
information shared and displayed using GIS application tools. The GIS
application tools help the users in analyzing the spatial data, edit data in
maps, and make a presentation of the operations carried out in
applications. GIS has got applications for different fields like engineering,
planning, management, transport and logistics, insurance,
telecommunication, and business sector.

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Photogrammetry
• Photogrammetry is carrying out measurements with the aid of pictures,
particularly for the precise location of surface points. Found somewhere in the
middle of the 19th century, photogrammetry is an age-old technology as of
regular photography. The gap between 2 points lying on a plane which is in
parallelism with the plane of the image, may be found by measurement of
their distance on the image if the size of the image is understood.
• Photogrammetry can be split into three different words as:
Photo – Light
Gram – Drawing
Metry – Measurement

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• So, photogrammetry is the process carried out consisting of lights,
drawings, and measurements. The technology is implemented for creating
maps. These maps are designed using drone cameras, and hence it is
known as aerial photogrammetry.
• One who is familiar with photogrammetry can work in sectors private
organizations, government sector, agricultural sector, advertising
organizations, environmental and medical sectors.

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Photogrammetry finds application in the fields below:
• Topographic Mapping
• Architecture
• Engineering
• Manufacturing
• Quality Control
• Crime Investigation
• Geology

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• Archeology
• Meteorology
• Film Industry
• Gaming
• Automobile Sector
• Analysis of Accidents
• Transportation
• Logistics

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• Consider an optical lens as a middle of the read and light-weight rays
piercing straightly into the image through the center. If the standardization
of the camera is correct, i.e., we all know the focal distance, then we can
analyze the angles of the rays from entirely different points. Though we’ve
got three points within the state of affairs and their 3D coordinates, then
determinant the position of the middle gets simple.
• Further, the orientation of the exposure holds the importance. Instead, we
can accurately establish a location exploitation GPS from fundamental
knowledge.

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• When a square measures two overlapping pictures, there’s associate
choice to come across the 3D vectors from each image. Further, we can
outline the 3D location of points within the state of affairs.
• Our brain performs this calculation of intersection once observing a 3D
film or stereo. Even in computer’s vision, two pictures square measure
combined to supply higher results.

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Conclusion:
• The modern technology needs a supportive system for mapping purposes.
With the advent of new technologies, photogrammetry is proving to be
useful for almost all the fields of work and its importance is growing
nowadays.
• Photogrammetry is hence fulfilling public demands very effectively.
• Source: https://blog.nibt.education/2018/03/photogrammetry-usage-in-
gis/