Oblique imagery refers to aerial photographs captured at an angle of 40 to 45 degrees, offering a more realistic view of the environment compared to traditional orthographic images. This technique is widely used in various fields, including urban planning, geology, and environmental studies. The most common system uses a mechanical rig with five cameras arranged in a cross configuration: one pointing straight down (nadir) and four angled at 45 degrees for oblique views.
Compared to standard vertical imagery, oblique photography provides more detailed information about ground features, such as building facades, tree canopies, and other vertical structures. It allows users to observe objects from multiple perspectives, making it easier to understand spatial relationships and improve data interpretation. With advanced software, measurements like height, length, and area can be taken directly from the images, enhancing their practical use.
One of the key benefits of oblique imagery is its ability to generate accurate 3D models of cities or large areas quickly. These models are valuable for urban development, infrastructure planning, and disaster management. Additionally, oblique images offer higher resolution and better coverage than traditional methods, reducing the time and cost required for data collection.
The accuracy of oblique photography depends on several factors, including the number and placement of ground control points (GCPs). These points help ensure that the images are correctly aligned with real-world coordinates. GIS software is often used to process the data, correcting geometric errors and improving overall precision.
Oblique photos have a wide range of applications. They are used in smart city projects to create 3D models for urban planning, in mining operations to monitor open-pit sites, and in construction for bridge design and BIM integration. They are also valuable in agriculture, forestry, and environmental monitoring, providing detailed insights into land use and terrain changes.
Real-world examples highlight the effectiveness of oblique imagery. In the Taklimakan Desert, researchers used JOUAV drones equipped with multi-lens cameras to study river flow and sediment movement. The project covered 2.78 square kilometers in just 70 minutes, saving significant time and resources compared to traditional ground surveys. Similarly, in the Weinan 3D city modeling project, high-resolution oblique images were used to create a detailed 3D model of a 700-square-kilometer area, aiding in urban development and infrastructure planning.
Another example comes from Wanhua Chemical Plant, where oblique imagery was used to digitally map the facility, improving traffic management, waste disposal, and environmental monitoring. The efficiency of this method has significantly reduced the time required for large-scale modeling projects.
In conclusion, oblique imagery offers a powerful tool for capturing detailed, real-world data. By combining high-resolution cameras with advanced processing technologies, it enables accurate 3D modeling, efficient data collection, and improved decision-making across multiple industries. JOUAV drones equipped with oblique imaging systems are increasingly being used in urban management, land surveying, emergency response, and more, demonstrating the growing importance of this technology in modern applications.
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