CN111458025A - Device and method for remote sensing reflectivity conversion - Google Patents
Device and method for remote sensing reflectivity conversion Download PDFInfo
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- CN111458025A CN111458025A CN202010395020.9A CN202010395020A CN111458025A CN 111458025 A CN111458025 A CN 111458025A CN 202010395020 A CN202010395020 A CN 202010395020A CN 111458025 A CN111458025 A CN 111458025A
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- 238000002310 reflectometry Methods 0.000 title claims abstract description 47
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001228 spectrum Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000007781 pre-processing Methods 0.000 claims abstract description 5
- 230000005855 radiation Effects 0.000 claims description 7
- 238000003384 imaging method Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000012952 Resampling Methods 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0297—Constructional arrangements for removing other types of optical noise or for performing calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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Abstract
The invention discloses a device and a method for remote sensing reflectivity conversion. When acquiring aviation imager data, the device is adopted to acquire diffuse reflection plate radiance data, spectrum drift detection is carried out on the aviation imager data, then two kinds of data are integrated to generate reflectivity conversion auxiliary data, and finally reflectivity data conversion is carried out. The method solves the problem of the prior reflectivity data processing aiming at low-altitude aerial remote sensing, has the advantages of simplicity and feasibility, and plays an important role in imager data preprocessing and remote sensing application.
Description
Technical Field
The invention belongs to the field of data processing of remote sensing detection and imaging spectrometers, and particularly relates to a device and a method for remote sensing reflectivity conversion.
Background
The remote sensing reflectivity conversion is a key step of remote sensing quantification application and is limited by factors such as the constraint of measuring equipment, the complexity of an atmospheric model and the like, and the reflectivity conversion is difficult to carry out on most of aviation remote sensing data at present, so that the application of the data is limited. Currently, the remote sensing reflectivity conversion includes the following modes: firstly, paving a large number of targets, arranging a plurality of monitoring devices, and carrying out ground synchronous measurement; secondly, performing reflectivity conversion by using a general radiation transmission model (MODTRAN, 6S and the like); and thirdly, designing a zenith light monitoring module on the airborne imager to perform synchronous illumination measurement.
Although the above methods solve the problem of reflectivity conversion to a certain extent, they all have many disadvantages: the method is time-consuming and labor-consuming, has higher requirements on instruments and equipment, and has few units with measuring equipment, and a patent with the application number of CN200310122943.3 is the method, and a large amount of manual synchronous measurement is needed; the second method is usually a plurality of universal model parameters, relates to a large amount of radiation transmission calculation, and is difficult to guarantee the precision; and in the third method, the instrument and equipment are required to be modified and upgraded, and the installation requirement of the aerial survey plane with a top opening is met. Therefore, a simple device and method are needed to adapt to the existing numerous aerial imagers, realize the conversion of the remote sensing reflectivity and promote the application of the remote sensing data.
Disclosure of Invention
The invention aims to solve the problems that: the device and the method suitable for remote sensing data reflectivity conversion are provided, and the problem of the conventional aviation remote sensing reflectivity conversion is solved.
A device for converting remote sensing data reflectivity is composed of a diffuse reflection plate 1, a support 2, a lens 3, an optical fiber 4, a spectrometer 5 and a computer module 6, wherein the diffuse reflection plate 1 is horizontally placed, the lens 3 is fixed on the support 2, the lens 3 is aligned with the diffuse reflection plate 1 and is filled with a view field, the lens 3 and the spectrometer 5 are connected through the optical fiber 4, and the spectrometer 5 is connected with the computer module 6.
The method suitable for the reflectivity conversion of the remote sensing data based on the device comprises the following steps:
(1) a reflectivity conversion device is arranged in the center of the aerial survey area, and the diffuse reflection plate radiation brightness data are collected while the aerial data are collected.
(2) And (3) spectrum drift detection, namely preprocessing the data of the aerial imager, based on the laboratory spectrum calibration data of the imaging spectrometer, performing spectrum drift detection by using parameters such as the atmospheric absorption peak of the data of the aerial imager, acquiring the central wavelength and the half-wave width of the data of the aerial imager, and converting the image voltage value into the radiance by using the data and the radiation calibration coefficient.
(3) Reflectivity conversion assistance data is generated.
(3-1) performing data resampling on the diffuse reflection plate radiance data by taking the central wavelength and the half-wave width of the aerial imager data as the reference and referring to the central wavelength and the half-wave width of the spectrometer, and generating radiance data consistent with the aerial imager data wavelength;
and (3-2) performing time alignment on the acquisition time of the radiance data of the aerial imager and the radiance data of the diffuse reflection plate, performing interpolation on the radiance data of the diffuse reflection plate again by using a time mark, and finally acquiring reflectivity auxiliary data consistent with the time and wavelength of the data of the aerial imager.
(4) And (4) reflectivity data conversion, namely dividing the imager radiance data and the reflectivity auxiliary data after time and wavelength registration to generate reflectivity data.
By the method, the reflectivity of the aerial remote sensing image can be converted, the labor cost can be greatly saved, the reflectivity has high precision, each single-point observation data can be suitable for the reflectivity conversion of the aerial remote sensing image in the measuring area range of 100 square kilometers, observation points can be distributed for multiple times in the measuring area for large-area flight, and the reflectivity conversion of the remote sensing imager data in the large measuring area is realized.
Drawings
FIG. 1 shows a device for reflectance conversion of remotely sensed data.
FIG. 2 shows a process of reflectivity conversion of remote sensing data.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Fig. 1 depicts a block diagram of the components of a device for remote sensing reflectance conversion, which consists of a diffuse reflection plate 1, a bracket 2, a lens 3, an optical fiber 4, a spectrometer 5 and a computer module 6, wherein: the diffuse reflection plate 1 is a standard diffuse reflection plate with reflectivity superior to 96%, a 3-degree lens is used for a lens 3, the observation range is ensured to be the diffuse reflection plate, the lens 3 is fixed on a support 2, the stability of observation height and angle is ensured, the lens 3 is connected with a spectrometer 5 through an optical fiber 4, the spectrometer 5 is connected with a computer module 6, the computer module comprises a diffuse reflection plate data acquisition control unit and a reflectivity calculation unit, and the diffuse reflection plate data acquisition control unit realizes the control of the spectrometer and controls the acquisition and storage of data; the reflectivity calculation unit realizes the preprocessing of the data of the aerial imager and the data of the diffuse reflection plate and realizes reflectivity conversion.
The method of remote sensing reflectance conversion is described in detail below with reference to fig. 2 and examples.
(1) The method comprises the steps that data acquisition work of an aerial imager is carried out in a range of about 100 square kilometers in a certain area, a remote sensing reflectivity conversion device is installed in the center of a measurement area before an airplane enters the measurement area, aerial remote sensing flight is carried out, synchronous acquisition of diffuse reflection plate radiation brightness data is carried out, the acquisition frequency is 2Hz, the wavelength range of acquired data is 350-2500nm, the spectrum interval is 1nm, 2151 wave bands are totally obtained, M groups of diffuse reflection plate radiation brightness data are obtained, the aerial imaging spectrometer acquires aerial imager data for imaging the ground, the acquisition frequency is 20Hz, the data spectrum range is 400-1000nm, 64 wave bands are totally obtained, each row of data is 512 elements, the aerial imager data is DN value, and L frames of aerial imager data are totally obtained.
(2) And (3) spectrum drift detection, namely preprocessing the data of the aerial imager, performing spectrum drift detection by using the oxygen absorption peak parameter of the aerial imager data near 762nm based on the central wavelength and the half-wave width of 64 wave bands acquired by the imaging spectrometer in laboratory spectrum calibration data, acquiring the actual central wavelength and the half-wave width of the flight aerial imager data, completing the conversion from the DN value to the radiance by using the spectrum parameter and the radiance calibration coefficient, and converting the original DN value into the radiance data.
(3) Reflectivity conversion assistance data is generated.
(3-1) selecting diffuse reflection plate radiance data corresponding to 64 wave band spectral ranges of the aerial imager data by taking the new central wavelength and half wave width parameters of the aerial imager data as the reference and referring to the central wavelength and half wave width of the surface feature spectrometer, performing convolution operation on each wave band, and generating M groups of diffuse reflection plate radiance data only with 64 wave bands;
(3-2) carrying out time alignment on the acquisition time of the aerial imager data and the diffuse reflection plate radiance data, firstly acquiring the time of each frame of image, recording the time as t, extracting two groups of diffuse reflection plate data closest to the time t from M groups of diffuse reflection plate radiance data, wherein the two groups of data time are respectively t1And t2Wherein t is1≤t≤t2And interpolating the two groups of diffuse reflection plate radiance data again, and finally obtaining L groups of 64-waveband reflectivity auxiliary data consistent with the time and spectrum wavebands of the aerial imager data.
(4) And (3) converting the reflectivity data, and dividing L frames of imager data by L groups of reflectivity auxiliary data which are registered by time and wavelength, so as to finally generate the aerial remote sensing reflectivity data.
Claims (2)
1. The utility model provides a device of remote sensing reflectivity conversion, includes diffuse reflection board (1), support (2), camera lens (3), optic fibre (4), spectrum appearance (5), computer module (6), its characterized in that:
the diffuse reflection plate (1) is horizontally arranged, the lens (3) is fixed on the support (2), the lens (3) is aligned with the diffuse reflection plate (1) and is filled with a view field, the lens (3) and the spectrometer (5) are connected through the optical fiber (4), and the spectrometer (5) is connected with the computer module (6).
2. A reflectivity conversion method of a remote sensing reflectivity conversion device according to claim 1, comprising the steps of:
1) a reflectivity conversion device is arranged at the central position of the aerial survey area, and the diffuse reflection plate radiation brightness data are collected while the aerial data are collected;
2) performing spectrum drift detection, namely performing data preprocessing on the data of the aerial remote sensing imager, performing spectrum drift detection by using parameters such as an atmospheric absorption peak and the like of the data of the aerial remote sensing imager based on the laboratory spectrum calibration data of an imaging spectrometer, acquiring the central wavelength and the half-wave width of the data of the aerial remote sensing imager, and completing the conversion from an image voltage value to radiance by using the data and a radiance calibration coefficient;
3) the reflectivity conversion auxiliary data is generated by the following specific method:
3-1) taking the center wavelength and the half-wave width of the data of the aerial imager as the reference, and performing data resampling on the radiance data of the diffuse reflection plate by referring to the center wavelength and the half-wave width of the spectrometer to generate radiance data consistent with the data wavelength of the aerial imager;
3-2) carrying out time alignment on the collection time of the radiance data of the aerial imager and the radiance data of the diffuse reflection plate, carrying out interpolation on the radiance data of the diffuse reflection plate again by using a time mark, and finally obtaining reflectivity auxiliary data with the time and wavelength consistent with the data of the aerial imager;
4) and (4) reflectivity data conversion, namely dividing the imager radiance data and the reflectivity auxiliary data after time and wavelength registration to generate reflectivity data.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237851A (en) * | 2021-05-13 | 2021-08-10 | 季华实验室 | Aerial remote sensing method and system |
| CN117091811A (en) * | 2023-08-25 | 2023-11-21 | 中国科学院合肥物质科学研究院 | Automatic time-sharing measurement method and device for observing radiance of multiple targets in calibration field |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237851A (en) * | 2021-05-13 | 2021-08-10 | 季华实验室 | Aerial remote sensing method and system |
| CN117091811A (en) * | 2023-08-25 | 2023-11-21 | 中国科学院合肥物质科学研究院 | Automatic time-sharing measurement method and device for observing radiance of multiple targets in calibration field |
| CN117091811B (en) * | 2023-08-25 | 2024-02-06 | 中国科学院合肥物质科学研究院 | Automatic time-sharing measurement method and device for observing radiance of multiple targets in calibration field |
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