There is the long History of Photogrammetry use in the field of surveying and mapping. Photogrammetry can also use for measuring points as well as to generate point-clouds.
Point-clouds which generates from Photogrammetry is portable, cost-effective, and also versatile as compared to its LiDAR-Laser Imaging, Detection & Ranging and Chief rival. Thus, it has always had a faithful following among practitioners.
In the previous years, however, interest in the concept of Photogrammetry among surveying professionals are enjoying a higher boom in the industry. This recent trend has catalyzed because of the rise of low-priced and affordable, aerial drones, or UAVs (Unman Aerial vehicle). The UAVs provide many benefits which make Photogrammetry not only friendly but also more accessible. Thus, this has driven to a revitalized interest in the technology.
The Benefits of Photogrammetry in Ground-Based Surveying are-
- Photogrammetry is the method which generates a 3D model with the help of a set of 2D photographs.
- In the surveying, by using two or more than that images of the similar point from the several different angles. Furthermore, these images are then loaded and placed into Photogrammetry software like Photo Modeler; this relocates the images by a baseline. And also it uses that data to differentiate the elevation of that point. To create a detailed mesh model of the entire area, you can take and also use enough of these images
What is LiDAR in Photogrammetry?
LiDAR is the essential technological choice to Photogrammetry for dense point cloud modeling. And it also usually called laser scanning. LiDAR works and operates by transmitting a pulsed laser along the point, and it also measures the time it needs to reflect back. Thus, unlike Photogrammetry, it requires merely a single direction, i.e., “line of sight.” And it can perform it better satisfied for specific applications like mapping vegetation-heavy areas.
However these technological differences, Photogrammetry have presented continuously a very remarkable “business proposition,” for numerous reasons:
Let’s check more-
- It’s cost-effective- LiDAR equipment ore device is costly, and it also requires specialized expertise to operate it correctly. Photogrammetry needs only a DSLR camera and the software that can work on a standard computer machine.
- It’s easily accessible & available- Due to the requirement for the specialized device, equipment tools, and operators, LiDAR resources are usually difficult to secure on short-term notice. Photogrammetry equipment can fit and match in the back of any surveyor’s truck, and also you can operate it efficiently yourself.
- It is versatile- Photogrammetry technology has emerged to the point where it’s tremendous global-purpose imaging engine. LiDAR has further specific use cases due to technological constraints. Such as the majority of the equipment, and difficulty in acquiring high-resolution images.
Hence, these benefits present Photogrammetry an appealing prospect for certain kinds of ground-based surveying. While ground-based LiDAR has its place, accessibility and broad application of Photogrammetry have made it a natural “default” option in multiple situations.
Aerial surveying, yet, is another different story. While several of the above strengths still apply. Aerial Photogrammetry has historical one clear bottleneck: the aircraft itself. Renting an airplane with a techno-scientific aerial camera could often negate photogrammetry’s key powers – they are quite expensive, inconvenient to mobilize, and limited in the levels of elevation and angles they can capture. Because of this, the decision between aerial Photogrammetry and LiDAR has conventionally been less clear-cut.
Conclusion
Photogrammetry has always been a critical technology for mapping and surveyors, and the rise of new technologies have merely taken it to the next level.
No comments:
Post a Comment