On May 30, 2008, the ground synchronous observation of airborne infrared wide-angle dual-mode line / area array scanner (widas) was carried out in the encrypted observation area of Linze station. Widas is composed of 4 CCD cameras, 1 mid infrared thermal imager (AGEMA 550) and 1 thermal infrared thermal imager (S60). It can simultaneously obtain data of 5 angles of visible / near infrared (CCD) band, 7 angles of mid infrared band (MIR) and 7 angles of thermal infrared band (TIR). The observation contents include surface radiation temperature, soil moisture, surface feature spectrum, BRDF, fish eye camera measurement Lai and manual measurement Lai.
1. Soil moisture observation; Observation target: 0-5cm topsoil. Observation instrument: ring knife (volume 50cm ^ 3), ml2x soil moisture rapid tester. Observation quadrat and observation times: ly07 quadrat under the seventh route and ly08 quadrat under the Eighth Route in the desert transition zone from east to West (9 observations each). The pretreatment data is soil volume water content. Data storage: Excel.
2. Surface radiation temperature observation; Observation instrument: hand held infrared thermometer (cold and drought Institute 5#, cold and drought Institute 6#); All instruments have been calibrated (please refer to the calibration data of handheld infrared thermometer. XLS). Observation quadrat and observation times: ly07 and ly08 (49 observation points per quadrat, 3 repetitions per observation point). Preprocessing data according to the thermal infrared calibration data (the standard source is blackbody), the measured temperature of each instrument is linearly fitted with the corresponding blackbody temperature to obtain the fitting equation, and then the above fitted equation is used to calibrate the observed original observation data. Data storage: Excel.
3．BRDF； Observation instrument: ASD spectrometer of Beijing Normal University, 350-2500 nm; 40% reference plate; The multi angle observation frame includes an old multi angle observation frame of Beijing Normal University, a new multi angle observation frame made by Beijing Normal University in 2008 and a new multi angle observation frame made by Remote Sensing Institute. Observation site: wulidun farmland quadrat and desert transition zone. Sample type: corn. Storage mode: this data set includes original data and preprocessed data. The original data is composed of binary files and record tables, and the binary files can be read by viewspecpro software; The processed reflectivity and transmittance are in text format.
4. Fish eye camera measures Lai. Observation instruments: Canon eos40d camera, Canon ef15 / 28 fisheye lens and camera support. Observation site: wulidun farmland quadrat area I, desert transition zone and poplar forest. Observation object: corn; Poplar; Desert shrub. Shooting method: most photos are taken from top to bottom. For higher crops, they are taken from bottom to top. Under special circumstances, such as when the light is too strong, they are taken at a downward tilt of 45 degrees. See the fish eye camera measurement record of the day for specific shooting conditions. Storage method: the data includes the original photos taken and can_ The results after eye5.0 software processing. The original photo format is JPG, and the processing result file format is excel.
5. Measure Lai by manual measurement method; Observation quadrat: wulidun farmland quadrat D and H sub quadrat. Measurement scheme: use straight edge and triangular plate. The data document stores the length and width of all leaves of 4 to 5 samples taken from the experimental quadrat, and the quadrat survey document stores the number of plants in each quadrat. Some samples were measured with lai-3100, and compared with the manual measurement value, the correction parameters were obtained to correct the manual measurement value. Use a ruler and a triangular plate to sample, measure and record the leaf length and width, the total number of crops in the quadrat and the quadrat size, calculate the average leaf area of the crop, multiply the total number of plants in the quadrat, obtain the estimated total leaf area of the crop, and divide it by the quadrat area. Storage method: this data is processed data, and the file format is excel table. The average value of Lai measurement of observation quadrat every day is obtained.
See the metadata "Heihe integrated remote sensing joint test: layout of quadrat transects in the densified observation area of Linze station" for the distribution and number of quadrat transects, and see the quadrat transect coordinates.xls of the densified observation station of Linze station for the quadrat location
On May 30, 2008, the ground synchronous observation of airborne infrared wide-angle dual-mode line / area array scanner (widas) was carried out in the encrypted observation area of Linze station. Widas is composed of 4 CCD cameras, 1 mid infrared thermal imager (AGEMA 550) and 1 thermal infrared thermal imager (S60). It can simultaneously obtain data of 5 angles of visible / near infrared (CCD) band, 7 angles of mid infrared band (MIR) and 7 angles of thermal infrared band (TIR). The observation contents include surface radiation temperature, soil moisture, surface feature spectrum, BRDF, fish eye camera measurement Lai and manual measurement Lai
1. Soil moisture observation. From east to west, ly07 quadrat under the seventh route and ly08 quadrat under the Eighth Route in the desert transition zone (9 observations each).
2. Observation of surface radiation temperature. Ly07 and ly08 (49 observation points per quadrat, 3 repetitions per observation point).
3．BRDF。 The multi angle observation frame includes an old multi angle observation frame of Beijing Normal University, a new multi angle observation frame made by Beijing Normal University in 2008 and a new multi angle observation frame made by Remote Sensing Institute.
4. Fish eye camera measures Lai. Most photos are taken from top to bottom. For higher crops, they are taken from bottom to top. Under special circumstances, such as when the light is too strong, they are taken at a downward tilt of 45 degrees. See the fish eye camera measurement record of the day for specific shooting conditions.
5. Measure Lai by manual measurement. Use a straight edge and a triangle. The data document stores the length and width of all leaves of 4 to 5 samples taken from the experimental quadrat, and the quadrat survey document stores the number of plants in each quadrat. Some samples were measured with lai-3100, and compared with the manual measurement value, the correction parameters were obtained to correct the manual measurement value. Use a ruler and a triangular plate to sample, measure and record the leaf length and width, the total number of crops in the quadrat and the quadrat size, calculate the average leaf area of the crop, multiply the total number of plants in the quadrat, obtain the estimated total leaf area of the crop, and divide it by the quadrat area.
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CSTR:11738.11.ncdc.NIEER.2021.1801
10.12072/ncdc.NIEER.db1834.2022