What is Photogrammetry?
As the name implies, Photogrammetry is a 3-dimensional coordinate measurement technique that makes use of the photograph as the fundamental medium for measurement. The whole process of Photogrammetry mainly depends on camera positioning base on the given subject and light control to process high-resolution details of skin and clothing as the complete process. The scanning can be used to capture data for different projects like face replacements and CG characters.
Albrecht Meydenbauer who happens to be a Prussian architect was the first person to use the photogrammetry expression in the year 1867. He was also the one who created some of the earliest topographic elevation drawings and maps. Photogrammetry services are common mainly in topographic mapping, but due to technology advancements, it has been widely applied in fields like medicine, industry, engineering, architecture, underwater, forensic, geology and many others to produce precise 3D data.
Branches of photogrammetry
There are two broad-based branches in photogrammetry which are:
- Metric Photogrammetry
This particular process of Metric Photogrammetry is used for the measurements and computations of a given photograph base on its size, position, and shape of the photographic. This process can also be used to obtain other information like relative volumes of features, areas, locations. However, this process is used primarily in the engineering fields like surveys, and it’s taken using a metric camera.
- Interpretive Photogrammetry
This is another process of Photogrammetry that is used to recognize and to identify of the photographic features on a photograph like a shape, pattern, shadow, size, etc. to create value and intelligence for the seen photograph information.
Why is photogrammetry so useful?
There are many reasons to why Metric Photogrammetry is very useful these days. Metric Photogrammetry help provides a unique way of observing and recording information since photography is essentially “non-contact,” and this can be done without physical presence. This is very true, considering cases of aerial photography. The civilian application process has also applied the advantages of aerial photogrammetry. Some of following represent the application of this: natural disaster, surveying, environmental studies, civil engineering, agricultural forecasting, site development, insurance studies, real estate, mineral and geotechnical research, land use and planning, and construction. Mapping is also very important in meeting the public demands for convenience, transport, and comfort.
Of course, it is not always possible to take accurate measurements from any photo or set of photos. Some criteria need to be met. Each case is specific because of all the various types of variables involved in taking pictures in different situations. It is essential to speak with a photogrammetry expert and provide them with all the photos for review to be entirely sure.