Types of remote sensing images

The electromagnetic radiation reflected by ground objects or emitted by themselves, after being processed by the imaging system, produces an image-like image similar to the original object, which is characterized by the point-to-point representation of objects, that is, only objects within a certain field of view can be displayed in the form of points on the image plane, and the radiation energy of each object point can only be projected to the corresponding point on the image plane. Both visible waves and invisible waves can form an intuitive image, which can be recorded and stored in photosensitive materials or displayed on a display, or recorded and stored on a magnetic tape as a latent image of digital data. An image obtained by shooting or scanning the earth's surface with a remote sensor installed on a remote sensing platform is called a remote sensing image. The image similar to the original object produced by remote sensing image after processing or recoding is called remote sensing image. In order to distinguish remote sensing images with different imaging methods, two-dimensional continuous images imaged by optical photography are usually called photos, and one-dimensional continuous and one-dimensional discrete images imaged by scanning are images. In the application of remote sensing, according to the type of remote sensing platform, there are aerospace, aviation and ground remote sensing images; The electromagnetic wave bands recorded by images are divided into ultraviolet, visible light, near infrared, thermal infrared, microwave images and multi-band and ultra-multi-band images. There are large, medium and small scale images according to the image scale. Remote sensing images also have color and black and white, and color images can be divided into true color and false color, and so on.

Classification of remote sensing images according to the working band and imaging mode of imaging remote sensors commonly used in remote sensing geology can not only reflect the image characteristics, but also reveal the information connotation of images (Table 3-2).

Figure 3-26 Near Real-time Transmission of Video Data

Table 3-2 Classification Table of Remote Sensing Images by Imaging Mode and Working Band of Imaging Remote Sensor