The photogrammetry is broadly classified into two types as Aerial Photogrammetry and Terrestrial Photogrammetry. Aerial and Terrestrial photogrammetry are used for mapping and measurement related issues. Aerial is far range & terrestrial is close range photogrammetry

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Aerial Photogrammetry
vs.
Terrestrial Photogrammetry

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Introduction
• Photogrammetry is the science and technique that blends photography
and geometry. The principle is straightforward, yet it has a significant
impact on contemporary architectural establishments.

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The procedure of photogrammetry, you can check here–
• We all know that photography generates 2D illustrations.
The photogrammetry system produces 3D estimations of the object and
surface from the 2D image/photograph.
• If you read our previous blogs on photogrammetry, then you will know
that Aerial and Terrestrial are two major varieties of photogrammetry.
• Let’s understand each one by one-

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Aerial photogrammetry
• A machine, especially an aircraft (purposefully designed plane) or a drone,
i.e. Unmanned Aerial Vehicle (UAV) has the cameras attached. Therefore, it
can capture photos from the higher surface. The larger the number of images,
the higher is the accuracy of the statistics. It further helps in comparison of the
quality.
• The planes fly over the planned area with particular landmarks which they
have to capture. The speed of the aircraft regulates the camera’s catching
speed. Also, they know the height of the plane from the land surface. The
photographed surface area’s base contour/boundary is drawn using Stereo
Plotters.

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Terrestrial photogrammetry
• The word Terrestrial means relating to Earth. Therefore it explains that
why the camera is in the stationary position in this kind of
photogrammetry. The camera’s position is elevated, and the tilt angle, the
focal length of the lens is adjusted.

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Read More on Why Aerial Photogrammetry Differs from the Terrestrial One.
• The main difference is between the working and methodologies, even
though both are the branches of the photogrammetry.
• Therefore, the outputs generated are very varied from each other.

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Apprehend the following points to notice the
distinction-
• The technical requirements of the Aerial photogrammetry are very high-
end; the specially designed planes or drones are just the initials.
• Although there is a much lesser investment in Terrestrial photogrammetry,
there is the requirement of high technical skills for operating the tools.
• To map a large surface area of the land, we can use Aerial
photogrammetry. But the knowledge of longitudes and latitudes with their
calculations are essential in photogrammetry operation.

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• When there is a need for designers and planners to manage and plan bridges,
transportation network, pipeline networks, etc. then Terrestrial photogrammetry is
preferred. The adjustments of the camera’s axis as per the surface area matter a lot.
• The environmental projects which trace the changes of glaciers, volcanoes,
earthquakes, etc., use terrestrial photogrammetry methods.
• The fixed location of the camera creates such kind of data sets to work upon further.
• There are various benefits of aerial photogrammetry in the security field as well.
Archaeology also gets numerous advantages through aerial photogrammetry as you can
see a big chunk of the area at once.

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• Terrestrial photogrammetry is preferable for movement-related and
comparatively smaller land masses, unlike the aerial one.
• The arena where both the fields play an active role is Urban Planning! That’s
obvious as with the help of aerial photogrammetry, designers and planners
generate an accurate perspective plan of the site or location. An aerial view
gives a bright idea of all around the neighborhood, and so it helps in further
assessment.
• Terrestrial photogrammetry, unlike aerial, creates visuals showing interrelation
between civil constructions, safety issues, disaster management and various
other problems. Thus, it helps in knowing the creation, prevention, and
demolition of any civilization.

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Final Derivation
• Thus, it’s evident that by using both sorts of photogrammetry, we can
generate most efficient and disaster-prone constructions/infrastructures.
• So these were the fundamental differences between aerial and terrestrial
photogrammetry. Have you had a clear insight?
• Source: https://blog.nibt.education/2018/03/difference-between-aerial-
and-terrestrial-photogrammetry/