On July 1, 2008, the synchronous measurement of spaceborne hyperspectral sensor proba Chris was carried out in Yingke oasis and huazhaizi desert intensive observation area. BRDF spectral data, multi angle thermal infrared radiation temperature, canopy radiation temperature, CE318 solar spectrophotometer atmospheric parameters of row sowing maize, maize and wheat in Yingke oasis maize field, maize in huazhaizi desert maize field and canopy spectra of tomato, sunflower, flax and naodou in other temporary observation points were measured. (1) The data of fraction of photosynthetically active radiation (FPAR) were collected from maize and wheat in Yingke oasis. The measuring instruments are SunScan canopy analyzer and digital camera. The incident and reflected par were measured at the same time. FPAR = (to canopy par - surface transmission par - canopy reflection par + surface reflection PAR) / to canopy par; apar = FPAR × to canopy par.
(2) BRDF data of row maize. The object of measurement is row sowing corn in Yingke oasis. The instrument is ASD spectrometer (350-2500nm) of Institute of remote sensing application of Chinese Academy of Sciences and the multi angle observation frame of spectrum made by Beijing Normal University. The observation frame can measure the spectrum at the height of 5m from the ground, azimuth angle of 0-360 ° and zenith angle of - 60 ° to 60 °. The main plane and vertical main plane, vertical ridge plane and along ridge plane were selected for BRDF measurement. The interval of each observation is 10 degrees. On the main plane, the forward observation angle is positive and the backward observation angle is negative. The vertical observation is 0 ° and the angle increases gradually to both sides. At the same time, a fixed self recording point thermometer is installed on the observation frame to measure the multi angle thermal radiation temperature, which can be seen in the metadata of "Heihe comprehensive remote sensing joint experiment: Chris synchronous measurement multi angle thermal radiation temperature data on July 1, 2008".
(3) Radiation temperature measured by fixed self recording radiation point thermometer. The measured object is the canopy of row sowing maize in Yingke oasis. Because of the height of maize, the probe of the instrument is 50cm away from the canopy. The specific emissivity of the instrument is set at 0.95.
(4) The data of atmospheric parameters of CE318 solar spectrophotometer. This data set is the atmospheric parameters measured by solar spectrophotometer produced by cimel company in France. The measurement site is the roof of the activity room of the resort. CE318 solar spectrophotometer can reverse the optical thickness, Rayleigh scattering and aerosol optical thickness of non water vapor channel through the direct solar radiation measurement data. The water vapor content of atmospheric column can be obtained from the 936nm measurement data of water vapor channel, and the horizontal visibility can also be derived from CE318 data. CE318 of Beijing Normal University is used in this measurement, which can provide optical thickness of 1020nm, 936nm, 870nm, 670nm and 440nm, and can be used to retrieve water vapor content of atmospheric column.
(5) The multi angle infrared radiation temperature measured by the fixed self recording point thermometer of the Institute of remote sensing application, Chinese Academy of Sciences, which is mounted on the BRDF spectrum observation frame at the same period. The maximum height of the observation frame is 5m from the ground, the azimuth angle is 0 ~ 360 ° and the zenith angle is - 60 ~ 60 ° for spectrum measurement. The main plane and vertical main plane, vertical ridge plane and along ridge plane were selected for BRDF measurement. The interval of each observation is 10 degrees. On the main plane, the forward observation angle is positive and the backward observation angle is negative. The vertical observation is 0 ° and the angle increases gradually to both sides. The sampling time interval of fixed self recording point thermometer is 0.05s. The specific emissivity of the instrument is 1.0. The data is stored in text file (. Dat format, and some files may overlap in content). The first seven lines in each text file are descriptive header files, including data collection date, record start time, record interval, etc To convert it into the actual time, you need this value plus the starting time toBJ: target temperature tint: probe internal temperature Tbox: cavity temperature. Tint and Tbox are useless. Tact: the actual temperature converted from the given emissivity. Since the instrument specific emissivity is 1.0, the value is the same as toBJ.
On July 1, 2008, the spaceborne hyperspectral sensor proba Chris was synchronously measured in the dense observation area of Yingke oasis and huazhaizi desert. BRDF spectral data, multi angle thermal infrared radiation temperature, canopy radiation temperature and CE318 solar spectrophotometer atmospheric parameter data of row sown maize were measured in Yingke oasis maize field; And the canopy spectra of corn and wheat in Yingke oasis corn field, corn in huazhaizi desert corn field and tomato, sunflower, flax, brain bean and other temporary observation points
（ 1) The measured objects are corn and wheat in the corn plot of Yingke oasis. The measuring instruments are SunScan canopy analyzer and digital camera. The measurement is divided into upper and lower sections, and the incident and reflected par are measured at the same time. FPAR = (reaching canopy par - surface transmission par - canopy reflection par + surface reflection PAR) / reaching canopy par; APAR=FPAR × Reach the canopy par.
（ 2) BRDF data of row sowing maize. The measuring object is corn sown in Yingke oasis. The measuring instruments are ASD spectrometer (350-2500nm) of Institute of remote sensing application, Chinese Academy of Sciences and spectral multi angle observation frame made by Beijing Normal University. The observation frame can carry out spectral measurement at a height of up to 5M from the ground, azimuth angle of 0 ~ 360 ° and zenith angle of - 60 ° ~ 60 °. In the BRDF measurement of row sowing maize, the main plane and vertical main plane, vertical ridge plane and along ridge plane were selected for observation. Each observation is made at 10 ° intervals. The forward observation angle on the main plane is positive and the backward observation angle is negative. The vertical observation is 0 °, and the angle value gradually increases to both sides. At the same time, a fixed self recording point thermometer is also installed on the observation frame to measure the multi angle thermal radiation temperature, which can be seen in the metadata of "Heihe comprehensive remote sensing joint test: Chris synchronous measurement - multi angle thermal radiation temperature data on July 1, 2008".
（ 3) Radiation temperature measured by fixed self recording radiation point thermometer. The measured object is the row sowing corn canopy in Yingke oasis. Due to the height of corn, the instrument probe is 50cm away from the canopy height. The specific emissivity of the instrument is set to 0.95.
（ 4) CE318 solar spectrophotometer atmospheric parameter data. This data set is the atmospheric parameters measured by the solar spectrophotometer produced by cimel, France. The survey site is the roof of the resort activity room. CE318 solar spectrophotometer can inverse the optical thickness, Rayleigh scattering and aerosol optical thickness of non water vapor channel through direct solar radiation measurement data. The water vapor content of atmospheric column can be obtained from 936nm measurement data of water vapor channel, and the horizontal visibility can also be derived from CE318 data. CE318 of Beijing Normal University is used in this measurement, which can provide the optical thickness of five bands: 1020nm, 936nm, 870nm, 670nm and 440nm, and the water vapor content of the atmospheric column can be retrieved from the 936nm measurement data.
（ 5) The multi angle infrared radiation temperature measured by the fixed self recording point thermometer of the Institute of remote sensing application of the Chinese Academy of Sciences on the BRDF spectrum observation frame in the same period. The observation frame can measure the spectrum at a height of up to 5M from the ground, with an azimuth of 0 ~ 360 ° and a zenith angle of - 60 ° ~ 60 °. In the BRDF measurement of row sowing maize, the main plane and vertical main plane, vertical ridge plane and along ridge plane were selected for observation. Each observation is made at 10 ° intervals. The forward observation angle on the main plane is positive and the backward observation angle is negative. The vertical observation is 0 °, and the angle value gradually increases to both sides. The sampling time interval of the fixed self recording point thermometer is 0.05s. The specific emissivity of the instrument is 1.0.
The data is stored in text files (. Dat format, and some files may overlap in content). The first 7 lines in each text file are descriptive header files, including data collection date, recording start time, recording time interval, etc. in addition, they include 5 columns of data, such as time, toBJ, tint, Tbox, tact, etc, The corresponding description is as follows: time: the time from the beginning of recording. If converted to the actual time, this value needs to be added with the starting time toBJ: target temperature tint: probe internal temperature Tbox: cavity temperature. The two data of tint and Tbox are useless. Tact: the actual temperature converted according to the given emissivity. Since the specific emissivity of the instrument is 1.0, this value is the same as toBJ.
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CC BY 4.0 (Creative Commons Attribution 4.0 International License).
CSTR:11738.11.ncdc.NIEER.2021.1723
10.12072/ncdc.NIEER.db1753.2022
