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Anonymous users2024-02-13First, electromagnetic waves are different.
Active remote sensing: The electromagnetic waves used in active remote sensing are microwave bands and lasers, mostly with pulse signals, and some with continuous beams.
Passive remote sensing: The electromagnetic waves used in passive remote sensing are microwaves, infrared, and visible light.
Second, the principle is different.
Active remote sensing: The principle of active remote sensing is to emit a certain form of electromagnetic wave from an artificial radiation source on the remote sensing platform to the target, and then the sensor receives and records its reflected waves.
Passive remote sensing: The principle of passive remote sensing is that the detection instrument obtains and records the electromagnetic wave information emitted or reflected from the natural radiation source by the target object itself.
Third, the characteristics are different.
Active remote sensing: Active remote sensing is characterized by not relying on solar radiation, can work day and night, and can actively select the wavelength and emission mode of electromagnetic waves according to the different detection purposes.
Passive remote sensing: Passive remote sensing is characterized by the fact that it does not carry a radiation source.
Encyclopedia - Passive remote sensing.
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Anonymous users2024-02-12Active remote sensing is a remote sensing method in which a remote sensor emits electromagnetic radiation energy of a certain frequency to a target object, and then receives the radiation energy returned from the target.
Passive remote sensing is a remote sensing method that directly receives the radiant energy from the target. The vast majority of the energy** is the radiation of the sun to the ground objects. There is also a small part that may be geothermal.
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Anonymous users2024-02-111.The difference between remote sensing inversion and quantitative remote sensing of surface parameters is mainly due to the different objects of inversion.
2.Remote sensing inversion of land surface parameters refers to the numerical values of surface parameters, such as surface hand-prepared temperature, vegetation index, etc., obtained by means of satellite remote sensing images and other means, through the separation and destruction of image data and the processing of image data.
Quantitative remote sensing refers to the sensor statistics obtained by remote sensing, combined with ground observation data, using modern mathematical statistics and geographic information system (GIS) and other technical means to quantify land surface information and variables, and form numerical expressions to reflect the actual situation of the observed area.
3.Therefore, remote sensing inversion of land surface parameters focuses on obtaining quantitative values of land surface parameters, while quantitative remote sensing focuses more on comprehensively estimating the changes of land surface parameters to obtain an overall understanding of the regional environment.
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Anonymous users2024-02-10Passive remote sensing, also known as passive remote sensing, is a detection system that does not have a radiation source in the remote sensing system itself; That is to say, in the remote sensing detection, the detection instrument obtains and records the electromagnetic wave information emitted or reflected from the natural radiation source (such as the sun) by the target object itself. For example: aerial photography system, infrared scanning system, etc.
Remote sensing surveys using passive remote sensing systems are called passive remote sensing. Prederm.
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Anonymous users2024-02-09Test Topic: Basic Working Principles of Remote Sensing Special Topic: Analysis:
Remote sensing refers to the non-contact, long-distance detection technology Qi Hongtuan generally refers to the use of sensors Remote sensors to detect the radiation and reflection characteristics of the object's electromagnetic waves, and according to its characteristics of the object's properties, characteristics and high orange state analysis of the theory, method and application of science and technology Through the detection of the radiation and reflection characteristics of the object's electromagnetic waves to distinguish different ground objects Therefore, a Comments: Examine the problems of geographic information technology, and test the ability to mobilize and apply knowledge The working principle of remote sensing technology is to distinguish different features by using the different electromagnetic wave characteristics of different features
It depends. I think it's better to be active than passive, because initiative is to want to do it from the heart, and if you are passive, you don't count it in your heart.
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main point is using port or pasv cmd.
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