CN116413233B - Tower foundation remote sensing inclined-path atmospheric transmittance obtaining method - Google Patents
Tower foundation remote sensing inclined-path atmospheric transmittance obtaining method Download PDFInfo
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- CN116413233B CN116413233B CN202211663620.4A CN202211663620A CN116413233B CN 116413233 B CN116413233 B CN 116413233B CN 202211663620 A CN202211663620 A CN 202211663620A CN 116413233 B CN116413233 B CN 116413233B
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- 238000002834 transmittance Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000001228 spectrum Methods 0.000 claims abstract description 27
- 238000002310 reflectometry Methods 0.000 claims description 15
- 230000003595 spectral effect Effects 0.000 description 11
- 238000012937 correction Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention discloses a tower foundation remote sensing inclined-path atmospheric transmittance acquisition method, which comprises the following steps: the method comprises the steps of arranging an on-tower target and a spectrum sensor on a high tower, arranging a ground target on the ground, measuring the irradiation brightness of the on-tower target and the ground target through the spectrum sensor, and obtaining the inclined-path atmospheric transmittance between the spectrum sensor and the ground target according to the irradiation brightness of the on-tower target and the irradiation brightness value of the ground target. The inclined-path atmospheric transmittance acquisition method provided by the invention is simple and convenient, and is independent of the acquisition of the whole layer of atmospheric transmittance, and the inclined-path atmospheric transmittance from the tower base sensor to the observation target is directly acquired.
Description
Technical Field
The invention relates to a tower foundation remote sensing inclined-path atmospheric transmittance acquisition method, and belongs to the field of high-altitude ecological remote sensing monitoring.
Background
Taking an iron tower as a basic platform, and utilizing a camera or other sensors carried on the iron tower to observe near the ground is called tower foundation remote sensing. The tower foundation remote sensing is not easy to be influenced by natural factors such as cloud cover and the like, can acquire video information in real time in all weather, and can effectively fill the scale gap between the aerospace remote sensing and the ground observation network.
The method is mainly used for acquiring the vertical optical thickness of the atmosphere under the condition of sunny days, and the atmospheric transmittance is required to be acquired in the process.
However, compared with satellite and airborne observation, the tower base remote sensing is an observation mode with a large inclination angle near the ground, so that a long optical path phenomenon exists on a tower base rocker, the atmospheric transmittance is difficult to obtain, accurate atmospheric correction based on radiation transmission is difficult to perform, and at present, only a method for performing image enhancement based on the characteristics of an image and the like can be adopted to perform rough atmospheric correction, so that the correction accuracy is low, and quantitative application of sensors such as multispectral sensors and hyperspectral sensors is further influenced.
For the above reasons, it is necessary to provide a method for accurately obtaining the slope atmospheric transmittance in tower-based remote sensing.
Disclosure of Invention
In order to overcome the problems, the inventor of the present invention has conducted intensive studies and devised a method for obtaining atmospheric transmittance of a remote sensing inclined path of a tower foundation, which comprises: the method comprises the steps of arranging an on-tower target and a spectrum sensor on a high tower, arranging a ground target on the ground, measuring the irradiation brightness of the on-tower target and the ground target through the spectrum sensor, and obtaining the inclined-path atmospheric transmittance between the spectrum sensor and the ground target according to the irradiation brightness of the on-tower target and the irradiation brightness value of the ground target.
In a preferred embodiment, the target is a diffuse reflector of known and fixed reflectivity, with isotropic reflection properties.
In a preferred embodiment, the ramp atmospheric transmittance may represent:
T=（E b *ρ a ）/(E a* ρ b )
wherein,E a represents the target radiance value on the tower,E b represents the radiance value of the ground target,ρ a representing the reflectivity of the target on the tower,ρ b representing the reflectivity of the ground target.
In a preferred embodiment, the method further comprises: obtaining the corresponding inclined-path atmospheric transmittance of different wave band lights;
and obtaining the atmospheric A ngstr m index through the corresponding inclined-path atmospheric transmittance of the light with different wave bands.
In a preferred embodiment, the spectral sensor has at least two, or
The spectrum sensor is a sensor capable of detecting the radiance under at least two wave band spectrums,
and detecting the target radiance value on the tower and the target radiance value on the ground under different wave bands to obtain the inclined-path atmospheric transmittance of the corresponding wave band.
In a preferred embodiment, the slope atmospheric transmittance for different bands of light is expressed as:
T λi =（E bi *ρ ai ）/(E ai *ρ bi )
wherein,λiindicating the wavelengths of light in the different wavelength bands,T i representation ofλiBand lightThe corresponding oblique-path atmospheric transmittance is that,E ai representation ofλiThe target radiance value on the tower under the wave band light,E b representation ofλiGround target radiance value under band light,ρ a representing pairs of targets on a towerλiThe reflectance of the light in the wavelength band,ρ b representing ground target pairsλiReflectance of band light.
In a preferred embodiment, the atmospheric a ngstron index is expressed as:
wherein,λi、λjrepresenting the wavelength of light in any two different bands.
In a preferred embodiment, the method further comprises: ground targets are arranged at different positions of the ground in the area to obtain the inclined-path atmospheric transmittance at different positions, so as to obtain the atmospheric inclination Cheng Touguo rate in the whole area.
In a preferred embodiment, a plurality of ground targets are disposed at different locations on the ground within the area, and the spectral sensor is rotated or adjusted to measure the radiance values of the different ground targets, thereby obtaining the slant atmospheric transmittance of the spectral sensor to the ground at the different locations.
In a preferred embodiment, the atmospheric tilt Cheng Touguo rate in the observation area is obtained by interpolating the tilt atmospheric transmittance at different locations.
The invention has the beneficial effects that:
(1) The method is simple and convenient, and the inclined-path atmospheric transmittance from the tower base sensor to the observation target is directly obtained;
(2) The acquisition of the transmittance of the inclined-path atmospheric parameters is independent of the acquisition of the transmittance of the whole atmosphere, so that the uncertainty in the parameter acquisition process is reduced.
Drawings
FIG. 1 is a schematic view showing the acquisition of the inclined atmospheric transmittance in the inclined atmospheric transmittance acquisition method according to a preferred embodiment of the present invention;
FIG. 2 shows a schematic diagram of multi-position measurement in a method for obtaining the slant-range atmospheric transmittance according to a preferred embodiment of the invention.
Detailed Description
The invention is further described in detail below by means of the figures and examples. The features and advantages of the present invention will become more apparent from the description.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The invention provides a method for obtaining the transmittance of inclined atmospheric,
the method comprises the steps of arranging an on-tower target and a spectrum sensor on a high tower, arranging a ground target on the ground, measuring the irradiation brightness of the on-tower target and the irradiation brightness of the ground target through the spectrum sensor, and obtaining the inclined-path atmospheric transmittance between the spectrum sensor and the ground target according to the irradiation brightness of the on-tower target and the irradiation brightness value of the ground target.
Further, the target is a diffuse reflector with known and fixed reflectivity, and has isotropic reflection characteristics.
In a preferred embodiment, the on-tower target or spectral sensor position/angle is variable such that one spectral sensor can measure the radiance value of the on-tower target, the ground target, respectively.
As shown in fig. 1, if the solar radiation reaching the ground is Es, the radiance at the ground target and the on-tower target observed at the tower base sensor can be expressed by the following formula:
E
b
=E
s
*ρ
b
*T
E
a
= E
s
*ρ
a
wherein:E a represents the target radiance value on the tower,E b represents the radiance value of the ground target,ρ a representing the reflectivity of the target on the tower,ρ b representing the reflectivity of the ground target;Tindicating the slope atmospheric transmittance.
Further, by measuring the target radiance value on the towerE a Radiance value with ground targetE b The method is simple and convenient to compare, can directly acquire the inclined-path atmospheric transmittance between the tower base sensor and the ground target, does not depend on the acquisition of the whole-layer atmospheric transmittance, and reduces the uncertainty in the parameter acquisition process.
And because the positions of the targets on the tower are similar to those of the ground targets, the solar radiation values of the positions are the same, and the method is not influenced by the acquisition of the vertical transmittance of the whole atmosphere and the complex characteristics of the surface reflectivity.
According to the present invention, the slope atmospheric transmittance may represent:
T=（E
b
*ρ
a
）/( E
a*
ρ
b
)
wherein,Tindicating the transmittance of the air in the inclined process,E a represents the target radiance value on the tower,E b represents the radiance value of the ground target,ρ a representing the reflectivity of the target on the tower,ρ b representing the reflectivity of the ground target.
The method further comprises the steps of:
obtaining the corresponding inclined-path atmospheric transmittance of different wave band lights;
and obtaining the atmospheric A ngstr m index through the corresponding inclined-path atmospheric transmittance of the light with different wave bands.
In the invention, unlike the traditional method, the slope atmospheric transmittance inversion corresponding to at least two wave band lights is used for obtaining the atmospheric A ngstr and m index.
In a preferred embodiment, the spectral sensor has at least two, or,
the spectral sensor is a sensor capable of detecting the radiance in at least two bands of spectrum, for example the spectral sensor is a multispectral sensor or a hyperspectral sensor, preferably a multispectral camera or a hyperspectral camera,
and detecting the target radiance value on the tower and the target radiance value on the ground under different wave bands to obtain the inclined-path atmospheric transmittance of the corresponding wave band.
In a preferred embodiment, the spectral sensor is a sensor capable of detecting optical radiance values in the wavelength band between 400 and 900 nm.
The wavelength range of 400-900nm comprises visible light-near infrared wave bands, and the wave band range is an important wave band for vegetation parameter inversion and is also an important wave band for surface reflectivity characteristics.
Specifically, the oblique atmospheric transmittance corresponding to light of different wavebands is expressed as:
T
λi
=（E
bi
*ρ
ai
）/(E
ai
*ρ
bi
)
wherein,λiindicating the wavelengths of light in the different wavelength bands,T i representation ofλiThe corresponding oblique atmospheric transmittance of the wave band light,E ai representation ofλiOn-tower target radiance value under band light, E b Representation ofλiGround target radiance value, ρ under wave band light a Representing pairs of targets on a towerλiReflectance of band light, ρ b Representing ground target pairsλiReflectance of band light.
Still preferably, in the present invention, the wavelength of the band light refers to a center wavelength of the band light, and is obtainable according to factory characteristics of the sensor.
In a preferred embodiment, the atmospheric a ngstr n index is obtained from the corresponding slope atmospheric transmittance of different band light in the following manner.
The atmospheric a ngstr foster indexExpressed as:
wherein,λi、λjrepresenting the wavelength of light in any two different bands.
According to the invention, the effect of the atmospheric A ngstr and the atmospheric transmittance are both important characteristics of the atmosphere, and can be used for judging the extinction effect of the atmosphere on solar radiation, so that the atmospheric A ngstr and the atmospheric transmittance are important input parameters for atmospheric correction in quantitative remote sensing.
In a preferred embodiment, a plurality of ground targets are disposed at different locations on the ground within the area, and the spectral sensor is rotated or adjusted to measure the radiance values of the different ground targets, thereby obtaining the slant atmospheric transmittance of the spectral sensor to the ground at the different locations.
Because the spectrum sensor has extremely high detection speed on the radiance value, the spectrum sensor is shared in the mode, so that the detection cost can be reduced, and the detection of all the radiance values can be realized.
In a preferred embodiment, the plurality of ground targets form a plurality of rows, as shown in fig. 2, so that the spectrum sensor can be conveniently adjusted to a small angle when measuring the ground targets one by one, thereby ensuring adjustment accuracy.
In a preferred embodiment, the atmospheric tilt Cheng Touguo rate in the observation area is obtained by interpolating the tilt atmospheric transmittance at different locations.
The atmospheric slope transmittance in the area generally does not have abrupt change, and the atmospheric slope Cheng Touguo rate in the observation area can be obtained by interpolating the slope atmospheric transmittance of the detected position.
Examples
Example 1
The inclined-path atmospheric transmittance of a certain place is detected by the following method:
setting an on-tower target and a spectrum sensor on a high tower, setting a ground target on the ground, respectively measuring the irradiation brightness of the on-tower target and the ground target through the spectrum sensor, and obtaining the inclined-path atmospheric transmittance between the spectrum sensor and the ground target according to the irradiation brightness of the on-tower target and the irradiation brightness value of the ground target;
obtaining the corresponding inclined-path atmospheric transmittance of different wave band lights;
obtaining an atmospheric A ngstr m index through corresponding inclined-path atmospheric transmittance of light of different wave bands;
wherein, the corresponding oblique journey atmospheric transmittance of different wave band light shows as:
T λi =（E bi *ρ ai ）/(E ai *ρ bi )
the atmospheric a ngstr foster index is expressed as:
the spectrum sensor is a multispectral camera capable of measuring wave bands, and the result of the inclined-path atmospheric transmittance detection is 0.84.
Using conventional oblique-path atmospheric transmittance methods (see articles Guo Jian, liu Liangyun, liu Xinjie, hu Jiaochan, cabernet. Tower base platform O based on a lookup table) ２ -a band atmospheric correction method study, 2019), and performing a slope atmospheric transmittance test on the ground at the same time, the test value being 0.84, similar to the measurement results of the above method, indicating that the above test method can be usedBy leaning on. However, compared with the traditional method, the method does not depend on a complicated radiation transmission equation or a lookup table, does not depend on the atmospheric transmittance of the whole layer, and is more convenient to acquire.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "front", "rear", etc. are based on the positional or positional relationship in the operation state of the present invention, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected in common; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention has been described above in connection with preferred embodiments, which are, however, exemplary only and for illustrative purposes. On this basis, the invention can be subjected to various substitutions and improvements, and all fall within the protection scope of the invention.
Claims (7)
1. A method for acquiring tower footing remote sensing inclined path atmospheric transmittance is characterized in that,
the method comprises the following steps: setting an on-tower target and a spectrum sensor on a high tower, setting a ground target on the ground, respectively measuring the irradiation brightness of the on-tower target and the ground target through the spectrum sensor, and obtaining the inclined-path atmospheric transmittance between the spectrum sensor and the ground target according to the irradiation brightness of the on-tower target and the irradiation brightness value of the ground target;
the ramp atmospheric transmittance T is expressed as:
T＝(E b *ρ a )/(E a *ρ b )
wherein E is a Representing the target radiance value on the tower, E b Represents the radiance value, ρ, of the ground target a Representing the reflectivity of the target on the tower ρ b Representing the reflectivity of the ground target;
the method further comprises the steps of: obtaining the corresponding inclined-path atmospheric transmittance of different wave band lights;
atmospheric is obtained through corresponding inclined-path atmospheric transmittance of light with different wave bandsAn index;
the spectrum sensor has at least two, or
The spectrum sensor is a sensor capable of detecting the radiance under at least two wave band spectrums,
and detecting the target radiance value on the tower and the target radiance value on the ground under different wave bands to obtain the inclined-path atmospheric transmittance of the corresponding wave band.
2. The method for obtaining the transparency according to claim 1, wherein,
the target is a diffuse reflector with known and fixed reflectivity and isotropic reflection characteristics.
3. The method for obtaining the transparency according to claim 1, wherein,
the corresponding oblique atmospheric transmittance of light of different wave bands is expressed as:
T λi ＝(E bi *ρ ai )/(E ai *ρ bi )
wherein λi represents the wavelength of light of different wavebands, T i Represents the inclined-path atmospheric transmittance corresponding to the light of the lambda i band, E ai Representing on-tower target radiance under lambada i band lightDegree value E b Represents the ground target radiance value, ρ under the light of lambda i wave band a Representing the reflectivity of the target on the tower to light in the lambda i band, ρ b The reflectivity of the ground target for light in the lambda i band is shown.
4. The method for obtaining the transparency according to claim 3, wherein,
the atmosphere isThe index is expressed as:
where λi, λj denote the wavelengths of any two different bands of light.
5. The method for obtaining the transparency according to claim 1, wherein,
the method further comprises the steps of: ground targets are arranged at different positions of the ground in the area to obtain the inclined-path atmospheric transmittance at different positions, so as to obtain the atmospheric inclination Cheng Touguo rate in the whole area.
6. The method for obtaining the transparency according to claim 1, wherein,
and arranging a plurality of ground targets at different positions on the ground in the region, and measuring the radiance values of the different ground targets by rotating or adjusting the spectrum sensor so as to obtain the inclined-path atmospheric transmittance from the spectrum sensor to the different positions on the ground.
7. The method for obtaining the transparency according to claim 6, wherein,
and (5) processing the slope atmospheric transmittance at different positions by an interpolation method to obtain the atmospheric slope Cheng Touguo rate in the observation area.
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