What Is Remote Sensing Analysis?

Remote sensing analysis refers to modern geography research methods that use remote sensing technology to explore the earth's surface and extract useful information from it. Remote sensing technology uses sensors from different platforms to collect the electromagnetic wave information of ground features, and then transmits this information to the ground and processes it to achieve the entire process of recognition and detection of ground features, that is, receiving, transmitting, processing, analyzing and The whole process of interpreting remote sensing information; by analyzing the spectral characteristics of the visible light, infrared light, and microwave radiation emitted by the ground landscape, it can obtain data about the temperature distribution and change of the earth's surface.

In order to fully apply remote sensing data in the process of remote sensing image interpretation, extract more information from it, and improve image braidability and sharpness, it is necessary to use optical technology or electronic computer technology to enhance the image and digital image processing to improve remote sensing Image interpretation conditions, highlighting the interpretation marks of target objects, and improving the practical application effect of remote sensing images. ^[2]

From the perspective of geographic research, with the continuous progress of remote sensing image data processing and analysis technology, modern remote sensing technology has penetrated more and more widely into the fields of geography research. This is because modern remote sensing can not only obtain a large amount of first-hand geographic data quickly, but also provide accurate and timely analysis results; not only can it provide local area information quickly, but it can also provide global information accurately and timely. This provides sufficient conditions for the development of modern geographic research from qualitative to quantitative, from static to dynamic, from local to overall, and from process to mode. In particular, as a comprehensive reflection of the natural and human environment, remote sensing images not only show the basic characteristics of natural geographic elements and their restrictive relationships, but also show the relevant influence relationship between human society and the natural environment, thus reflecting modern geography Regional and comprehensive requirements in the study.

From the 1990s to the present, modern geography research has focused on land resource development and planning, and geographic information systems. Remote sensing technology, as a technical means of research on two major topics, has been included in the research field by the vast number of geographers in China in time to carry out land resources Investigation, mapping and planning research, and the results are stored in a GIS database for storage and use at any time.

Agricultural Remote Sensing

The application of remote sensing technology in agriculture has also experienced the development of applied technology in other fields, that is, the process from visual interpretation, density segmentation, image processing to the establishment of application analysis models and expert systems. Agricultural information. Due to the large area of arable land, it is very difficult to use ground survey methods to obtain agricultural information from the perspective of national decision-making. This is because only the point data obtained in the ground survey method and the distribution of the points directly affect the credibility of the ground survey results. The investment of human and financial resources required for ground surveys is also a major issue worth considering. On the other hand, ground survey techniques, human interference, and standard ground surveys may not necessarily be grounded as a set of operable technical methods. Therefore, in order to obtain such agricultural information, quoting remote sensing technology is a new applicable method, which provides objective information that is not subject to human interference. At the same time, it is possible to obtain a wide range of such information. It has unparalleled advantages in ground survey methods.

Although satellite remote sensing data is still inadequate for the investigation of certain agricultural elements and its spatial resolution is extensive for broken farmland, the remote sensing technology is fast, multi-temporal, rich in comprehensive information, and objective survey methods of area type. So people still have great expectations on the application prospects of satellite remote sensing in agriculture. The application of most remote sensing data in agriculture will be called the mainstream technical means of obtaining agricultural information. ^[3]

Forestry Remote Sensing

At present, the main areas of application and research of remote sensing technology related to forests and forestry are as follows:

(1) Master the list of forest distribution and forest resources: forest resources distribution, forest resources (stock volume);

(2) Investigate the productivity and production environment of forest land: suitable forest land, tree species suitable for land, growth of forest stands, production volume, update situation (actual afforestation performance, etc.), road network in the forest;

(3) Investigate the forest harvesting status and disasters: productive timber harvesting, use of forest land (open roads for agricultural land, grazing land, golf courses, urban residential land), wasteland, forest fires, typhoons, heavy rain , Volcanic eruption, avalanches, pests and diseases;

(4) Investigate the environmental public welfare functions of forests: the functions of forming a certain environment (thermal environment, evaporative heat, seasonal dynamics of forest ecosystems, etc.), the function of conserving water sources, the function of land protection, etc .;

(5) Monitoring changes in forest resources and the environment over time;

(6) Forest management: management plan (operation implementation plan, logging plan, afforestation plan, forest road plan) and supervision and inspection of the plan, forest land use plan and regional plan; ^[3]

Remote sensing analysis

The ocean occupies 2/3 of the earth's surface. Therefore, it is difficult to estimate the impact of the oceans on the earth sciences that involve the entire earth. Especially nowadays, as human beings attach more and more importance to the deterioration of the earth s environment, it is urgent to explain the various phenomena caused by the oceans and the impact of the oceans on the entire earth as soon as possible. . In the past observations carried out on ships, point or line information can be obtained. The data does not have synchronization and is not suitable for grasping the sea-like phenomenon that changes from moment to moment. If we pay attention to the synchronicity of these information, we must deploy a lot of ships at various measuring points. It is unrealistic to do so from the viewpoint of labor and economy. Coupled with the fact that the huge capacity of the ocean and the severity of the natural environment are taken into consideration, it is difficult to observe the ocean with high time frequency and high spatial density. Therefore, even today, the observation of the ocean has not yet obtained sufficient data, which has also become an obstacle to deepening human understanding of the ocean. Therefore, it is hoped that the remote sensing technology with good wide area, synchronization and repeatability is applied to oceanography. Most of the ocean information obtained by remote sensing technology is also limited to the surface information of the ocean, which is also the shortcoming of current remote sensing technology. But even considering these shortcomings, synaesthesia is still an indispensable observation method for marine research, and it is indeed true that the ocean is one of the target areas on the earth where remote sensing technology can exert its greatest strengths.

The ocean information obtained from remote sensing is various, mainly including water temperature, seawater flow, waves, and density (water quality) information of marine matter dominated by plant plankton. Among them, water temperature and salt concentration are the most basic and important data in almost all research fields in oceanography. In recent years, water temperature can be measured by a spaceborne infrared radiometer. We have done a good job from the water temperature distribution with good synchronization in such a wide range to the state of Haiben flow and seawater mixing, and we have obtained new discoveries and insights. ^[3]

Atmospheric Remote Sensing

Atmospheric remote sensing can be divided into large-scale remote sensing (RS) using satellites and ground-based remote sensing through lidar. TIROS satellites from the 1960s and the subsequent practical weather satellite NOAA have become indispensable devices for weather forecasting. . In the field of research on the upper atmosphere, the Nimbus satellite series of the 1970s completed important tasks. It should be particularly pointed out that the temperature of the global distribution of H2O, CH4, and HNO3 was obtained for the first time using passive sensors deployed on the Yuyun series satellites. The TOMS carried on the Yuyun 7 is still available 12 years later. While continuing to observe the global amount of ozone, he has made great contributions to the discovery of the ozone hole, and obtained important information related to the destruction of the ozone layer in the stratosphere. The lidar in the active sensor is mainly used for observation of the lower atmosphere, and it is also applicable. For the observation of aerosols and ozone in the stratosphere. ^[3]