Photogrammetry uses photographs and measurements to create maps. Drones are increasingly used for aerial photogrammetry, as they are cheaper than planes and pose no risk to pilots. The document discusses how photogrammetry works by processing overlapping drone photos with software to generate 3D maps. It has many applications for construction professionals and allows creating detailed models and measurements from images.

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Photogrammetry: Latest Technology to
Create Maps Using Drones?

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• The use of drones is gaining tempo in recent years. Unlike manned aircraft, the
drones can stay overhead for many hours. The drones are much cheaper than
military aircraft and are flying remotely. Therefore, there is no danger to the
flight crew.
• The drone aircraft are in the news practically every day. There seems an
immense use of drones in the construction sector which are helpful for
construction professionals in various ways. In this article, we will learn to create
maps using drones with the use of photogrammetry technology.
• Drones (UAV- Unmanned Aerial Vehicle) are a buzzing word almost in every
field these days. That means it is an aircraft, of any size or type, that flies by
itself without onboard pilot or passengers. You may think of it as a robot plane,
controlled either autonomously or via remote control.
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Drones in Photogrammetry
• The combination of light (photo), drawings and measurements are
known as photogrammetry. Until recently, photogrammetry was a
very particular niche within the geospatial industry. Well, it was a
complicated subject accessible only to specialized experts.
However, photogrammetry is gaining impulse and is becoming more
and more universally available with the help of some easy courses
to learn photogrammetry.
• Photogrammetry is a now a field in which despite the need for
some training to understand the basic, there are many useful
applications such as creating 3D maps using aerial images

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• In a straightforward language, aerial photogrammetry is the
act of placing a camera on a flying vehicle and taking several
photos of the ground as it flies. The relevant images are being
processed in a computer using particular software which will
eventually generate a georeferenced and measured output.
• Using this technique, the users can make measurements from
photographs as well as giving a chance to photographers of
pinpointing the exact positions of surface points. With the
emergence and continuous evolution of computer imaging,
the process of photogrammetry is becoming a lot easier and
is, therefore, proving useful in the construction industry.
What is aerial photogrammetry?

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• Photogrammetric platforms are still carrying robust, sophisticated, expensive and
exact sensors. Using such systems, the need for robust software to resolve
photogrammetric issues is less relevant. The evolution of UAV (Unmanned Aerial
vehicle) in photogrammetry has been a game changer.
• The cameras are the essential gadgets of photogrammetry technology. These are
the individual cameras which have the excellent focal length to get better picture
quality.
• While taking pictures. the camera is commonly flying with its axis vertical, but
oblique and horizontal (ground-based) photographs are also possible. The
analytical and analog method accomplishes Data reduction and data conversion.
• In vertical aerial surveys, we get adjacent photos overlapping each other. The
automated sensors of the operators superimpose the two images for 3D viewing.

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• A Close-Range Photogrammetry (CRP) is one of the types of
photogrammetry. We will not see more of it, but in essence, it
comprises of aligning cameras closer to a subject to measure
building structure, revive forensic scenes, or model archaeological
objects. It is also known as “image-based modeling.”
• With the use of UAVs or the everyday cameras as well as the
modern software’s, the analog geometry is now archaic. By
analyzing every pixel in the images and comparing highly
overlapping sets of images, software packages can compute back to
the 3rd dimension unlike the human brain get a sense of depth
from the two eyes.

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Conclusion
• With the use of 3D images, a photogrammetrists
can create numeric models of natural systems. It
immensely establishes the possibility of
developing predictions and controlling the
impacts of natural disasters. From earthquakes to
tsunamis, we can now make easy predictions of
the multiple forces of the natures.

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Source
• https://blog.nibt.education/2018/03/photogr
ammetry-latest-technology-to-create-maps-
using-drones/