On July 11, 2008, the airborne wide-angle infrared dual-mode line / area array scanner (widas) and ENVISAT ASAR satellite synchronous ground observation test were carried out in the encrypted observation area of Linze station. The observation contents include soil moisture, surface radiation temperature, ground object spectrum, BRDF, LAI-2000 measurement Lai, fish eye camera measurement Lai, manual measurement Lai, etc.
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). ENVISAT ASAR data is AP mode, VV / VH polarization combination mode, and the transit time is about 11:26bjt.
1. Soil moisture observation; Observation target: 0-5cm topsoil. Observation instrument: ring knife (volume 50cm ^ 3), ml2x soil moisture rapid tester. Observation quadrats and sampling times: Desert East-West sample zone (including 40 sub quadrats, and each sub quadrat's corner point ring knife is sampled once), desert north-south sample zone (including 9 sub quadrats, and each sub quadrat's corner point ring knife is sampled once), ly06 and ly07 quadrats under the East-West flight route (9 observations each), wulidun farmland quadrat (each observation point ring knife is sampled once, Ml2x soil moisture meter (3 repetitions). 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#, Geography Institute); All instruments have been calibrated (please refer to the calibration data of handheld infrared thermometer. XLS). Observation quadrats and sampling times: ly06 and ly07 quadrats (49 observation points for each quadrat, 3 repetitions for each observation point) and wulidun farmland quadrats (multiple observation points are selected, 3 repetitions for each 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. Ground feature spectrum; Observation instrument: ASD spectrometer of Beijing Normal University, 350 ~ 2500 nm. Reference plate information: use 40% reference plate before June 15, and then change to 20% reference plate. Observation quadrat: wulidun farmland quadrat. Observation target: spectrum of surface features such as corn field, soil and soil with known water content. Data storage: data includes original data and preprocessed data. The original data is the binary file directly generated by the spectrometer, which can be opened with viewspecpro software. For detailed observation records, see the spectral observation record table of the day; The reflectance data obtained by preprocessing is in text format.
4．BRDF； Observation instrument: ASD spectrometer of Beijing Normal University, 350 ~ 2500 nm; Reference plate information: 40% reference plate shall be used before June 15, and then replaced with 20% 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 quadrat: wulidun farmland quadrat. Sample type: corn. Storage mode: this data set includes original data and processed 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.
5. Fish eye camera to measure Lai; Observation instruments: Canon eos40d camera, Canon ef15 / 28 fisheye lens and camera support. Observation quadrat: 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 observation record of that day for the 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.
6. LAI-2000 measuring Lai; Observation instrument: LAI-2000. Observation quadrat: quadrat in Linze station and farmland quadrat in wulidun. Observation object: corn storage method: record the measurement time, visual angle coverage, observation mode and repetition times, as well as the weather conditions of the day in the daily record table. LAI-2000 exports data every other period of time. The data stored in txt has a unique ID number. In post-processing, the data is determined according to the ID number of each record. This data set includes original data and post-processing data. The original data includes word record form and TXT data file; The post-processing data is excel.
7. Measure Lai by manual measurement. Observation quadrat: B2 and B3 quadrats in Linze station. Measurement scheme: 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 by 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 July 11, 2008, the airborne wide-angle infrared dual-mode line / area array scanner (widas) and ENVISAT ASAR satellite synchronous ground observation tests were carried out in the encrypted observation area of Linze station
1. Soil moisture observation; Observation target: 0-5cm topsoil. Observation instrument: ring knife (volume 50cm ^ 3), ml2x soil moisture rapid tester. Observation quadrats and sampling times: Desert East-West sample zone (including 40 sub quadrats, and each sub quadrat's corner point ring knife is sampled once), desert north-south sample zone (including 9 sub quadrats, and each sub quadrat's corner point ring knife is sampled once), ly06 and ly07 quadrats under the East-West flight route (9 observations each), wulidun farmland quadrat (each observation point ring knife is sampled once, Ml2x soil moisture meter (3 repetitions). 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#, Geography Institute); All instruments have been calibrated (please refer to the calibration data of handheld infrared thermometer. XLS). Observation quadrats and sampling times: ly06 and ly07 quadrats (49 observation points for each quadrat, 3 repetitions for each observation point) and wulidun farmland quadrats (multiple observation points are selected, 3 repetitions for each 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. Ground feature spectrum; Observation instrument: ASD spectrometer of Beijing Normal University, 350 ~ 2500 nm. Reference plate information: use 40% reference plate before June 15, and then change to 20% reference plate. Observation quadrat: wulidun farmland quadrat. Observation target: spectrum of surface features such as corn field, soil and soil with known water content. Data storage: data includes original data and preprocessed data. The original data is the binary file directly generated by the spectrometer, which can be opened with viewspecpro software. For detailed observation records, see the spectral observation record table of the day; The reflectance data obtained by preprocessing is in text format.
4．BRDF； Observation instrument: ASD spectrometer of Beijing Normal University, 350 ~ 2500 nm; Reference plate information: 40% reference plate shall be used before June 15, and then replaced with 20% 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 quadrat: wulidun farmland quadrat. Sample type: corn. Storage mode: this data set includes original data and processed 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.
5. Fish eye camera to measure Lai; Observation instruments: Canon eos40d camera, Canon ef15 / 28 fisheye lens and camera support. Observation quadrat: 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 observation record of that day for the 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.
6. LAI-2000 measuring Lai; Observation instrument: LAI-2000. Observation quadrat: quadrat in Linze station and farmland quadrat in wulidun. Observation object: corn storage method: record the measurement time, visual angle coverage, observation mode and repetition times, as well as the weather conditions of the day in the daily record table. LAI-2000 exports data every other period of time. The data stored in txt has a unique ID number. In post-processing, the data is determined according to the ID number of each record. This data set includes original data and post-processing data. The original data includes word record form and TXT data file; The post-processing data is excel.
7. Measure Lai by manual measurement. Observation quadrat: B2 and B3 quadrats in Linze station. Measurement scheme: 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 by 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.
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CSTR:11738.11.ncdc.NIEER.2021.1800
10.12072/ncdc.NIEER.db1844.2022