The hottest remote sensing spectral photography id

2022-08-15
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Remote sensing spectral photographing to identify earth material components what is remote sensing spectrum

when it comes to geological exploration and environmental investigation, people often think of the scene that researchers take samples on site and use physical and chemical methods to detect in the laboratory. Now as long as you take a picture, you can identify the components of the substance to be tested in a large area

it is learned from Nanjing University of technology that the "remote sensing geological application micro hyperspectral imager and data analysis system" developed by Jiangsu Provincial Key Laboratory of spectral imaging and intelligent perception jointly built by the University and Nanjing Geological Survey Center has turned this assumption into reality

all things will show unique spectral curves under light, which identify different substances like "ID cards". Using this characteristic, we can deduce which substances the spectral information comes from. However, there are still two major problems. First, it is difficult to improve the spectral resolution. At low resolution, the spectral curves of different substances are highly similar, and it is difficult to distinguish the subtle differences between different spectral information; Second, when collecting spectral information of a large area to be measured, a variety of substances in a unit pixel are mixed, so it is not easy to obtain the spectra of various pure substances. If the cascade method is used, the information can be used normally

after five years of efforts, the Key Laboratory of spectral imaging and intelligent perception of the university has successfully overcome two major problems, making the spectral resolution up to 4nm, equivalent to one tenth of the thickness of a piece of paper; At the same time, it realizes the "unmixing" of spectral information of various substances, and can self correct according to the longitude and latitude of the environment, atmosphere, illumination and other factors, so as to ensure the accuracy of the analysis results

the total weight of the whole system is less than 4.5kg, which can be carried on a helicopter to scan and shoot the whole mountain forest in a large area at an altitude of 2000 meters; It can also be carried on the UAV for low altitude operation, and the soil analysis of 10000 square meters of farmland can be completed within one hour; Geological exploration samples can also be analyzed on the desktop

at present, the system has been widely used in China's land and resources aerogeophysical fatigue testing machine. It has been put into use in units such as remote sensing center in the material industry. Compared with the ground measured data, the recognition accuracy is greater than 80%

remote sensing refers to non-contact, long-distance detection technology. Generally, it refers to the detection of the radiation and reflection characteristics of electromagnetic waves of objects by using sensors/remote sensors. Remote sensing is to detect target objects far away from the target and non-contact target objects through remote sensors, which are sensitive to electromagnetic waves

it is a science and technology to obtain the reflected, radiated or scattered electromagnetic wave information (such as electric field, magnetic field, electromagnetic wave, seismic wave and other information), and to extract, determine, process, analyze and apply it

remote sensing is a comprehensive technology for earth observation. Its realization requires not only a complete set of technical equipment, but also the participation and cooperation of various disciplines. Therefore, the implementation of remote sensing is a complex system engineering. According to the definition of remote sensing, the remote sensing system is mainly composed of the following four parts:

1. Information source information source is the object that remote sensing needs to detect. Any target object has the characteristics of reflection, absorption, transmission and radiation of electromagnetic waves from Jinan Shijin, the preferred manufacturer of the test machine. When the target object is the first of the seven national high-tech industrial bases of new material industry in China, it will form the electromagnetic wave characteristics of the target object when interacting with the electromagnetic wave, which provides the basis for obtaining information for remote sensing detection

2. Information acquisition information acquisition refers to the detection process of using remote sensing technology and equipment to receive and record the electromagnetic wave characteristics of the target. The remote sensing technology and equipment used for information acquisition mainly include remote sensing platforms and sensors. Among them, remote sensing platform is a vehicle used to carry sensors, commonly used balloons, aircraft and artificial satellites; Sensors are instruments and equipment used to detect the electromagnetic wave characteristics of objects. Commonly used are cameras, scanners and imaging radars

3. Information processing information processing refers to the technical process of using optical instruments and computer equipment to correct, analyze and interpret the obtained remote sensing information. The function of information processing is to master or eliminate the error of the original remote sensing information, sort out and summarize the image features of the detected object, and then identify and extract the necessary useful information from the remote sensing information according to the features through the correction, analysis and interpretation of the remote sensing information

4. Information application information application refers to the use process of professionals applying remote sensing information to various business areas for different purposes. The basic method of information application is to take remote sensing information as the data source of GIS for people to query, count, analyze and use. The application fields of remote sensing are very wide, and the main applications are: military, geological and mineral exploration, natural resource survey, mapping, environmental monitoring, urban construction and management, etc

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