Oblique photography technology is a high-tech developed in the field of international remote sensing and mapping in recent years. It breaks through the limitation that the traditional aerial survey single camera can only capture orthophoto images from a vertical angle. By carrying multiple image sensors on the same flight platform, it simultaneously collects real images with spatial information from multiple vertical and oblique angles. In order to obtain more comprehensive ground object texture details, it presents users with a real and intuitive world that conforms to human vision. The true 3D data of oblique photography can realistically reflect the appearance, position, height and other attributes of ground objects, enhance the high immersion brought by 3D data, and make up for the defect of low simulation degree of traditional artificial modeling. At the same time, the use of the more popular UAVs equipped with oblique photography cameras for terrain mapping and automatic modeling systems can bring revolutionary efficiency improvements to the field of surveying and mapping.
Image acquisition diagram
Schematic diagram of acquisition of several consecutive groups of images
Comparison of orthophoto and oblique images
Four-sided oblique images of the same feature
Oblique photography technical features:
Feature 1: Reflect the real situation around the objects
Compared with orthophotos, oblique images allow users to observe objects from multiple angles, more realistically reflect the actual situation of objects, and greatly make up for the shortcomings of orthophoto-based applications.
Feature 2: Tilt image can realize single image measurement
Through the application of the supporting software, measurement including height, length, area, angle, slope, etc. can be performed directly based on the result image, which expands the application of oblique photography technology in the industry.
Feature 3: Building side textures can be collected
For various 3D digital city applications, using the characteristics of large-scale mapping of aerial photography, coupled with the method of batch extraction and texture paste from oblique images, can effectively reduce the cost of urban 3D modeling.
Feature 4: Small amount of data is easy to publish online
Compared with the huge 3D data applied by 3D GIS technology, the data volume of the images obtained by the oblique photography technology is much smaller, and the data format of the images can be quickly published on the network using mature technologies to realize shared applications.
The application of oblique photography technology:
Aerial oblique images can not only truly reflect the situation of ground objects, but also greatly expand the application field of remote sensing images by adopting advanced positioning technology, embedding accurate geographic information, richer image information, and more advanced user experience. Make the industrial application of remote sensing images more in-depth.
Since oblique images provide users with richer geographic information and a more user-friendly experience, this technology has been widely used in emergency command, homeland security, urban management, real estate taxation and other industries in developed countries such as Europe and the United States.