CN105891124A - Water color parameter inversion device and method for near-shore estuary - Google Patents
Water color parameter inversion device and method for near-shore estuary Download PDFInfo
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Abstract
An embodiment of the invention provides a water color parameter inversion device and method for a near-shore estuary. According to the embodiment, a water bio-optical model is established through acquisition of remote sensing reflectance and water color parameters of the near-shore estuary, and the water bio-optical model is subjected to parameter optimization according to the acquired remote sensing reflectance and water color parameters; a near-shore estuary water color parameter inversion model of the water bio-optical model is established on the basis of a parameter optimization result of the water bio-optical model, water color parameter inversion of the near-shore estuary is realized, and an inversion result is obtained. With the adoption of the embodiment, the inversion precision of the water color parameters of the near-shore estuary can be improved.
Description
Technical field
The present invention relates to water colour optical remote sensing inverting field, in particular to one based on water constituent spectrum non-thread
The offshore river mouth water colour parametric inversion device and method of property effect calibration.
Background technology
At present, inverse model based on Photobiology can calculate water colour three elements (CDOM, float, chlorophyll a)
Concentration.Bio-optical model has preferable physical significance and certain universality, thus it is distant to have obtained increasing water colour
The extensive concern of sense scholar and use.But, offshore Estuary Inherent Optical Properties parameter is difficult to directly measure, and causes offshore
River mouth is difficult to apply bio-optical model.Aqueous bio optical model the most all assumes that between water body each component Inherent Optical Properties
Be combined as linear, and between the most muddy each component of offshore Estuary be the non-linear relation of complexity, directly
Connect the failure using this hypothesis may cause water colour parametric inversion.
Summary of the invention
In view of the foregoing, the embodiment of the present invention provides a kind of offshore river mouth water colour parametric inversion device, is applied to water colour
Parametric inversion equipment.Described inverting device includes:
Parameter acquisition module, for obtaining Remote Sensing Reflectance and the water colour parameter in offshore river mouth；
Optical model optimizes module, is used for setting up aqueous bio optical model, and according to the Remote Sensing Reflectance of described acquisition
And water colour parameter carries out parameter optimization to this aqueous bio optical model；
Inverse model sets up module, sets up bio-light for parameter optimization result based on above-mentioned aqueous bio optical model
Learn the water colour Parameter Inversion Model in the offshore river mouth of model, it is achieved the water colour parametric inversion to described offshore river mouth, obtain inverting
Result；And
Described result output module, joins for exporting described water colour by the output device of described water colour parametric inversion equipment
The inversion result of number.
It is anti-that the embodiment of the present invention also provides for a kind of offshore river mouth water colour parameter being applied to described water colour parametric inversion equipment
Drill method, including:
Parameters acquiring procedure, obtains Remote Sensing Reflectance and the water colour parameter in offshore river mouth；
Optical model optimization step, sets up aqueous bio optical model, and according to the Remote Sensing Reflectance of described acquisition and water
Color parameter carries out parameter optimization to this aqueous bio optical model；
Inverse model establishment step, parameter optimization result based on above-mentioned aqueous bio optical model sets up Photobiology mould
The water colour Parameter Inversion Model in the offshore river mouth of type, it is achieved the water colour parametric inversion to described offshore river mouth, obtains inversion result；
And
Described result output step, exports described water colour parameter by the output device of described water colour parametric inversion equipment
Inversion result.
Compared with prior art, the offshore river mouth water colour parametric inversion device and method that the embodiment of the present invention provides combines water
The Inherent Optical Properties model of body dynamic characteristic and Photobiology forward model, the water body reflectance of simulation different component combination
Feature, analyzes the response pattern between actual measurement reflectance and simulated reflectivity, and then research high muddy offshore river mouth difference water body
The nonlinear coupling effects of complicated components, can be effectively improved the inversion accuracy of water quality parameter.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by embodiment required use attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to this
A little accompanying drawings obtain other relevant accompanying drawings.
Fig. 1 is correcting for offshore based on water constituent spectrum nonlinear effect of present pre-ferred embodiments offer
River mouth water colour parameter carries out the block diagram of the water colour parametric inversion equipment of inverting.
Fig. 2 is the water colour parameter being applied to the water colour parametric inversion equipment shown in Fig. 1 that present pre-ferred embodiments provides
The flow chart of inversion method.
Fig. 3 is the signal that the water colour parametric inversion equipment shown in Fig. 1 is communicated with multiple Underway measurements equipment by network
Figure.
Fig. 4 is the Remote Sensing Reflectance spectrum Remote Sensing Reflectance spectrum comparison diagram with actual measurement of forward simulation.
Fig. 5 be by 531nm be extrapolated to its all band (412,443,490,555,667nm) reflectance the result show
It is intended to.
Fig. 6 is reflectance and the Rrs (412) of simulation, Rrs (443), Rrs (490), the Rrs of the Rrs (531) of simulation
(555) the fitting result schematic diagram of reflectance.
Fig. 7 is the float schematic diagram with the contrast scatterplot of the float of simulation of actual measurement.
Fig. 8 is the CDOM schematic diagram with the contrast scatterplot of the CDOM of simulation of actual measurement.
Fig. 9 is the chlorophyll a schematic diagram with the contrast scatterplot of the chlorophyll a of simulation of actual measurement.
Main element symbol description
Detailed description of the invention
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Generally exist
Can arrange and design with various different configurations with the assembly of the embodiment of the present invention that illustrates described in accompanying drawing herein.Cause
This, be not intended to limit claimed invention to the detailed description of the embodiments of the invention provided in the accompanying drawings below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, broadly falls into the scope of protection of the invention.
As it is shown in figure 1, be present pre-ferred embodiments provide based on water constituent spectrum nonlinear effect correction with
Block diagram in the water colour parametric inversion equipment 100 that offshore river mouth water colour parameter is carried out inverting.Described water colour parameter is anti-
Drill equipment 100.Described water colour parametric inversion equipment 100 may be, but not limited to, PC (personal computer,
PC), panel computer, server etc. possess the calculating equipment of data analysis and disposal ability.
Described water colour parametric inversion equipment 100 also includes an inverting device 10, memorizer 12 and processor 13.The present invention
In preferred embodiment, it is described that inverting device 10 includes that at least one can be stored in the form of software or firmware (firmware)
In memorizer 12 or be solidificated in the operating system (operating system, OS) of described water colour parametric inversion equipment 100
Software function module.Described processor 13 is for performing the performed software module of storage in described memorizer 12, such as described
Software function module included by inverting device 10 and computer program etc..In the present embodiment, described inverting device 10 can also
It is integrated in described operating system, as a part for described operating system.Specifically, described inverting device 10 includes that parameter obtains
Delivery block 101, optical model optimize module 102, inverse model sets up module 103 and result output module 104.Should illustrate
It is that in other embodiments, a portion in the above-mentioned functions module that described inverting device 10 includes also can be omitted, or
It can also include other more functional modules.
Below in conjunction with Fig. 2, above-mentioned each functional module is described in detail.
Refer to Fig. 2, be the water colour parametric inversion equipment 100 being applied to shown in Fig. 1 of present pre-ferred embodiments offer
The flow chart of water colour parameter inversion method.Idiographic flow shown in Fig. 2 and step will be described in detail below.
Step S01, described parameter acquisition module 101 obtains Remote Sensing Reflectance and the water colour parameter in offshore river mouth.Described water
Color parameter includes CDOM (chromophoric dissolved organic matter, Colored dissolved organic matter), float, Ye Lv
The concentration of element a.
Specifically, described Remote Sensing Reflectance can be by obtaining the field survey of each detection sampling point, described water colour parameter
Can be obtained by experimental assays.Underway measurements can be carried out in the waters of the test block set, take the remote sensing reflection of each sampling point
The water colour parameter of rate and synchronization, then by input equipment 11 parameter of described water colour parametric inversion equipment 100 (as mouse,
Keyboard etc.) mode that is manually entered obtains described Remote Sensing Reflectance and water colour parameter.Wherein, can be by spectra collection method at water
Face measurement carried out above obtains described Remote Sensing Reflectance.When measuring water spectral, in order to avoid shade and direct sunlight shine
Impact, use following observation geometric angle.Observed azimuth is about 135 ° (setting the incident azimuth of the sun as 0 °), sees
Observation vertex angle theta is about 40 °.The data measured include: on-gauge plate reflects spoke brightness, blocks the on-gauge plate reflection spoke of direct sunlight
Brightness, water surface spoke brightness, skylight spoke brightness and on-gauge plate reflection spoke brightness.While measuring wave spectrum, record each measuring point
Gps coordinate.When experimental assays obtains water colour parameter, the water body sample gathered in each observation station can be contained in brown bottle
Seal freezen protective, deliver to laboratory measurement.The mensuration of chlorophyll a uses metric measurement, and float uses to dry and claims
Weight method, the spectral absorptance of CDOM uses spectrophotometry.
It addition, in the present embodiment, it is possible in the test block set, such as the Xuwen Coral Reef nature reserve area (25 points),
The mouth of the Zhujiang River (18 points), three trial zones of Hanjiang estuary (22 points) lamp are respectively provided with Underway measurements equipment 200, by boating type
Scope 200 is tested described Remote Sensing Reflectance and gathers the water sample chemical examination described water colour parameter of acquisition.Further, such as Fig. 3
Shown in, described water colour parametric inversion equipment 100 can be set by the Underway measurements that network and the plurality of test block are respectively provided with
Standby 200 communications, and then obtain described Remote Sensing Reflectance and water colour parameter automatically by described Underway measurements equipment 200.
Step S02: described optical model optimizes module 102 and sets up aqueous bio optical model, and according to described acquisition
Remote Sensing Reflectance and water colour parameter carry out parameter optimization to this aqueous bio optical model.
Specifically, the aqueous bio optical model of foundation is as follows:
Wherein: Rrs (λ) is Remote Sensing Reflectance, f/Q is a coefficient relevant with region, illumination, wind speed etc., aw(λ) it is
Water body absorptance, bbw(λ) it is Backscattering Coefficients in Different Water Bodies, ag(λ) it is the CDOM absorptance in af at wavelength lambda, ax(λ) it is outstanding
Float is at the absorptance of af at wavelength lambda, aph(λ) it is the chlorophyll a absorptance in af at wavelength lambda, bbx(λ) it is the outstanding of af at wavelength lambda
The backscattering coefficient of float.
In formula (1), described Rrs (λ) is the Remote Sensing Reflectance of actual measurement；aw(λ)、bbw(λ) can directly obtain from document；
ag(λ) obtained by the CDOM absorptance of 440nm wavelength；ax(λ) obtained by concentration of suspension；aph(λ) by chlorophyll-a concentration
Obtain；Therefore, only b in above-mentioned aqueous bio optical modelbxIt is unknown quantity with f/Q, by iteration optimization solving equation group, so
Rear employing Simulated Anneal Algorithm Optimize iterative bbxAnd f/Q, the parameter to described aqueous bio optical model can be realized excellent
Change.
Wherein, the absorptance a of CDOMg(λ) can describe with exponential function well, concrete form such as following formula:
In formula, ag(λ) it is the CDOM absorptance in af at wavelength lambda, ag(λ0) it is the CDOM absorption system in reference wave strong point
Number, λ0It is reference wavelength, typically takes 440nm.SgFor slope, value is generally 0.015.
The absorptance model of described TSS can be expressed as following formula:
In formula, ax(λ) it is the non-pigmented particulate matter absorptance in af at wavelength lambda, SxGeneral value is 0.0113, ax(λ0)
For float at the absorptance of reference wave strong point, λ0It is reference wavelength, typically takes 440nm, in embodiments of the present invention ax
(440)=0.0216* [TSS]1.0247。
The relation of phytoplankton absorption coefficients and wavelength, can be expressed as following formula:
aph(λ)=A (λ) aph(λ0)B(λ) (8)
In formula, aph(λ) it is the phytoplankton absorptance in af at wavelength lambda, aph(λ0) it is that phytoplankton is in reference wave strong point
Absorptance, relation between the two can describe by power function: aph(443)=0.067* [Chla]0.607, A (λ), B (λ)
For the constant with wavelength change.
Backscattering coefficient b in above-mentioned floatbx(λ) and light field function f/Q optimization step in, only bbx(λ) and
F/Q is unknown quantity, needs iteration optimization solving equation group.Such as, optional the mouth of the Zhujiang River and the Xuwen Coral Reef protection zone (N=43)
Data carry out Model Parameter Optimization, obtain f/Q=0.1049, b by simulated annealing iterationbx(531)=0.268*
[TSS]0.295。
In the model of above-mentioned formula (1), input Chla concentration, TSS concentration, the absorptance of the CDOM at 440nm
Simulation obtains the Remote Sensing Reflectance at 531nm.Rrs (531) is extrapolated to its all band (see Fig. 4, Fig. 5, other wavelength of extrapolation
The Remote Sensing Reflectance at place except 667nm at error relatively greatly in addition to (RMSE=0.0036, MRE=27.4%, N=22), its all band
All having preferable precision (RMSE < 0.0023, MRE < 18.1%, N=22), result shows, the b of optimizationbxCan be suitable for f/Q
The simulation of this study area bio-optical model parameter.
Complete bbxAfter the optimization of f/Q, based on above-mentioned aqueous bio optical model, if it is known that CDOM, float,
The concentration of chlorophyll a just can simulate the Remote Sensing Reflectance of corresponding water body, can be developed based on water body on this basis raw
The optics forward model of thing.
Step S03, described inverse model sets up module 103 parameter optimization result based on above-mentioned aqueous bio optical model
Set up the water colour Parameter Inversion Model in the offshore river mouth of bio-optical model, it is achieved anti-to the water colour parameter in described offshore river mouth
Drill, obtain inversion result.
Specifically, this step S03 includes following sub-step:
Step S031, carries out gamma correction between component each to bio-optical model water body, particularly as follows: based on described light
Remote Sensing Reflectance and the actual measurement Remote Sensing Reflectance of learning forward model simulation analyze the response machine between each component of offshore Estuary
Reason, builds the gamma correction model between each component of water body on the basis of response pattern is analyzed.
Step S032, the parameter (b that will optimizebxWith f/Q etc.) as known parameters, obtain Remote Sensing Reflectance, set up water colour
The function of parameter.Specifically, after obtaining Remote Sensing Reflectance so that described aqueous bio optical model only exists three water
Color parameter is unknown number, and Remote Sensing Reflectance then can regard the function of water colour parameter as, formula specific as follows:
Wherein, in formula (2), A (includes A11、A12、A13、A51、A52、A53Deng) it is the matrix of M*N, M row represents wave band number, N
Row represent water quality parameter；X is the column vector of three unknown water colour parameters (CDOM, float, chlorophyll a)；YsimulatedFor generation
The row vector of table M-band number.
Step S033, builds constraints.In the present embodiment, in order to avoid unconfined iterative computation, according to model
The scope of application, and the maximum of test block water quality parameter and minima codomain, the constraints of the nonlinear equation of setting is:
X in formula (3)1Concentration (unit: μ g/l) for chlorophyll a；X2Concentration (unit: m-1) for CDOM；X3For suspending
The concentration (unit: mg/l) of thing, this spline equation just becomes the Nonlinear System of Equations of constraints.
Step S034, solves water colour parameter according to the constraints of above-mentioned structure, obtains inversion result.Specifically, at structure
After building up described constraints, i.e. can be exchanged into the least square solution of calculating formula (2), as follows:
In above-mentioned steps S03, just drilling and inverse model of water quality parameter based on aqueous bio optical theory, analyze near
Response Mechanism between each component of bank Estuary, carries out gamma correction between each component of water body.As shown in Figure 6, simulation
Rrs (531) with actual measurement Rrs (531) there are preferable linear relationship (model optimization data: RMSE=0.0016, N=43；
Modelling verification data: RMSE=0.0008, N=22), other wave band analogue value and measured value dependency poor (Fig. 6), this explanation
At 531nm, the relation between each component can be regarded as linear, and each component of water body of other wave band is nonlinear combination.
And the Rrs simulated (531) has preferably with simulation Rrs (412), Rrs (443), Rrs (490), the reflectance of Rrs (555) wave band
Dependency, use simulation Rrs (531) with simulation Rrs (412), Rrs (443), Rrs (490), the pass of Rrs (555) wave band
System, utilizes the Rrs (531) the surveyed reflectance to other wave band (Rrs (412), Rrs (443), Rrs (490), Rrs (555))
Correct, between the water constituent of each wave band after correction, linear combination can be regarded as.
It addition, it can be seen that TSS (RMSE=12.6mg/l, MRE=24.6%, N=61) from Fig. 7, Fig. 8, and Fig. 9
Preferable with the inversion result of CDOM (RMSE=0.729mg/l, MRE=26.3%, N=60).Chlorophyllous inversion result is
(RMSE=2.3 μ g/l, MRE=124.7%, N=56), relative above-mentioned two parameter is slightly worse, but has also reached higher inverting
Precision.
Step S04, described result output module 104 exports the inversion result of described water colour parameter.Specifically, the present embodiment
In, such as display by the output device of described water colour parametric inversion equipment, described water colour parametric inversion result can be exported, enters
And facilitate related personnel to observe.
In sum, the inversion method of the offshore river mouth water colour parameter of the embodiment of the present invention mainly includes following side
Face:
A. the backscattering coefficient b of floatbxOptimization with light field function f/Q.Survey (as seen by boating type with ground
Measurement equipment observation mode) Remote Sensing Reflectance, water colour three elements (Chla, TSS, CDOM absorptance at 440nm) be
Data source, with the b in simulated annealing iteration optimization offshore case Ⅱ waters bio-optical modelbxAnd f/Q.Described Chla,
TSS represents chlorophyll a and float respectively.
B. the gamma correction between each component of bio-optical model water body.Water quality based on aqueous bio optical theory is joined
Just drilling and inverse model of number, analyzes the Response Mechanism between each component of offshore Estuary, and further postgraduate's object light is studied the science
Nonlinear correction between each component of water body in Lun, uses the Rrs (531) of actual measurement to correct other wave band, after correcting
Remote Sensing Reflectance be input to build Photobiology inverse model in.
The numerical results of the present invention shows, simplifies offshore Estuary Inherent Optical Properties parameter acquiring method, uses
The Rrs (531) of actual measurement carries out correction and can improve nonlinear effect between each component of bio-optical model water body, pole other wave band
The big inversion accuracy that improve water quality parameter.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with scope of the claims.
Claims (10)
1. an offshore river mouth water colour parameter inversion method, it is characterised in that
(1) it is applied to carry out the apparatus of water colour parametric inversion；
(2) method that the water colour parametric inversion equipment described in applying step (1) carries out water colour parametric inversion,
Wherein, being applied to described in step (1) carries out the equipment of water colour parametric inversion,
Including: described inverting device includes:
Parameter acquisition module, for obtaining Remote Sensing Reflectance and the water colour parameter in offshore river mouth；
Optical model optimizes module, is used for setting up aqueous bio optical model, and according to the Remote Sensing Reflectance of described acquisition and water
Color parameter carries out parameter optimization to this aqueous bio optical model；
Inverse model sets up module, sets up Photobiology mould for parameter optimization result based on above-mentioned aqueous bio optical model
The water colour Parameter Inversion Model in the offshore river mouth of type, it is achieved the water colour parametric inversion to described offshore river mouth, obtains inversion result；
And
Described result output module, for exporting described water colour parameter by the output device of described water colour parametric inversion equipment
Inversion result；
Step (2) described method includes:
Parameters acquiring procedure, obtains Remote Sensing Reflectance and the water colour parameter in offshore river mouth；
Optical model optimization step, sets up aqueous bio optical model, and the Remote Sensing Reflectance and water colour according to described acquisition is joined
Several this aqueous bio optical model is carried out parameter optimization；
Inverse model establishment step, parameter optimization result based on above-mentioned aqueous bio optical model sets up bio-optical model
The water colour Parameter Inversion Model in offshore river mouth, it is achieved the water colour parametric inversion to described offshore river mouth, obtains inversion result；And
Described result output step, exports the inverting of described water colour parameter by the output device of described water colour parametric inversion equipment
Result.
2. a kind of offshore river mouth as claimed in claim 1 water colour parameter inversion method, it is characterised in that described water colour parameter is anti-
Drilling the Underway measurements equipment communication that equipment is respectively provided with by network and multiple test blocks, described parameter acquisition module passes through institute
State Underway measurements equipment and obtain described Remote Sensing Reflectance and water colour parameter.
3. a kind of offshore river mouth as claimed in claim 2 water colour parameter inversion method, it is characterised in that described water colour parameter bag
Include the concentration of CDOM, float, chlorophyll a.
4. a kind of offshore river mouth as claimed in claim 3 water colour parameter inversion method, it is characterised in that the water body of described foundation
Bio-optical model is as follows:
Wherein: Rrs (λ) is Remote Sensing Reflectance, f/Q is a coefficient relevant with region, illumination, wind speed, aw(λ) it is that water body is inhaled
Receive coefficient, bbw(λ) it is Backscattering Coefficients in Different Water Bodies, ag(λ) it is the CDOM absorptance in af at wavelength lambda, ax(λ) it is that float exists
The absorptance of af at wavelength lambda, aph(λ) it is the chlorophyll a absorptance in af at wavelength lambda, bbx(λ) it is the float of af at wavelength lambda
Backscattering coefficient；Described optical model optimizes module and passes through iteration optimization solving equation group, then uses simulated annealing
Optimized Iterative solves bbwAnd f/Q, it is achieved the parameter optimization to described aqueous bio optical model.
5. a kind of offshore river mouth as claimed in claim 4 water colour parameter inversion method, it is characterised in that inverse model sets up mould
Block realizes water colour parametric inversion to described offshore river mouth by performing following steps, obtains inversion result:
Gamma correction is carried out between component each to bio-optical model water body, particularly as follows: based on described optics forward model mould
Remote Sensing Reflectance and the actual measurement Remote Sensing Reflectance intended analyze the Response Mechanism between each component of offshore Estuary, at response pattern
The gamma correction model between each component of water body is built on the basis of analysis；
Parameter b that will optimizebxWith f/Q etc. as known parameters, obtain Remote Sensing Reflectance, set up the function of water colour parameter, described
The function of water colour parameter is as follows:
Wherein, A11、A12、A13、A51、A52、A53Being the matrix of M*N, M row represents wave band number, and N row represent water quality parameter；X1、X2、
X3It is the column vector of three unknown water colour parameters respectively；For representing the row vector of M-band number；
Build the constraints of nonlinear equation, such as following formula:
Wherein, X1For the concentration of chlorophyll a, X2For the concentration of CDOM, X3Concentration for float；
Constraints according to above-mentioned structure solves water colour parameter, obtains inversion result.
6. an offshore river mouth water colour parameter inversion method, is applied to water colour parametric inversion equipment, it is characterised in that described method
Including:
Parameters acquiring procedure, obtains Remote Sensing Reflectance and the water colour parameter in offshore river mouth；
Optical model optimization step, sets up aqueous bio optical model, and the Remote Sensing Reflectance and water colour according to described acquisition is joined
Several this aqueous bio optical model is carried out parameter optimization；
Inverse model establishment step, parameter optimization result based on above-mentioned aqueous bio optical model sets up bio-optical model
The water colour Parameter Inversion Model in offshore river mouth, it is achieved the water colour parametric inversion to described offshore river mouth, obtains inversion result；And
Described result output step, exports the inverting of described water colour parameter by the output device of described water colour parametric inversion equipment
Result.
7. offshore river mouth as claimed in claim 6 water colour parameter inversion method, it is characterised in that described water colour parametric inversion sets
The standby Underway measurements equipment communication being respectively provided with by network and multiple test blocks, automatically to obtain described remote sensing by network
Reflectance and water colour parameter.
8. offshore river mouth as claimed in claim 7 water colour parameter inversion method, it is characterised in that described water colour parameter includes
CDOM, float, the concentration of chlorophyll a.
9. offshore river mouth as claimed in claim 8 water colour parameter inversion method, it is characterised in that the aqueous bio of described foundation
Optical model is as follows:
Wherein: Rrs (λ) is Remote Sensing Reflectance, f/Q is a coefficient relevant with region, illumination, wind speed, aw(λ) it is that water body is inhaled
Receive coefficient, bbw(λ) it is Backscattering Coefficients in Different Water Bodies, ag(λ) it is the CDOM absorptance in af at wavelength lambda, ax(λ) it is float
At the absorptance of af at wavelength lambda, aph(λ) it is the chlorophyll a absorptance in af at wavelength lambda, bbx(λ) it is the float of af at wavelength lambda
Backscattering coefficient；Described optical model optimizes module and passes through iteration optimization solving equation group, then uses simulated annealing to calculate
Method Optimized Iterative solves bbxAnd f/Q, it is achieved the parameter optimization to described aqueous bio optical model.
10. offshore river mouth as claimed in claim 9 water colour parameter inversion method, it is characterised in that described inverse model is set up
Step includes:
Gamma correction is carried out between component each to bio-optical model water body, particularly as follows: based on described optics forward model mould
Remote Sensing Reflectance and the actual measurement Remote Sensing Reflectance intended analyze the Response Mechanism between each component of offshore Estuary, at response pattern
The gamma correction model between each component of water body is built on the basis of analysis；
Parameter b that will optimizebxWith f/Q etc. as known parameters, obtain Remote Sensing Reflectance, set up the function of water colour parameter, described
The function of water colour parameter is as follows:
Wherein, A11、A12、A13、A51、A52、A53Being the matrix of M*N, M row represents wave band number, and N row represent water quality parameter；X1、X2、
X3It is the column vector of three unknown water colour parameters respectively；For representing the row vector of M-band number；
Build the constraints of nonlinear equation, such as following formula:
Wherein, X1For the concentration of chlorophyll a, X2For the concentration of CDOM, X3Concentration for float；Constraint according to above-mentioned structure
Condition solves water colour parameter, obtains inversion result.
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| CN107064068A (en) * | 2017-01-12 | 2017-08-18 | 杭州师范大学 | A kind of remote sensing inversion method of turbid water body particulate organic carbon concentration |
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| WO2020207070A1 (en) * | 2019-04-09 | 2020-10-15 | 中国科学院深圳先进技术研究院 | Method and system for evaluating shenzhen sea water quality |
| CN110196239A (en) * | 2019-06-12 | 2019-09-03 | 中国科学院南京地理与湖泊研究所 | Turbid water body phytoplankton absorption coefficients spectral remote sensing inversion method |
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