On May 25, 2008, L & amp was carried out in the desert East-West transect, desert north-south transect and wulidun farmland transect in the intensive observation area of Linze station; K-band airborne microwave radiometer ground synchronous observation was carried out to observe soil moisture, surface radiation temperature and multi angle reflectance.
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, each sub quadrat corner point ring knife sampling), desert north-south sample zone (including 9 sub quadrats, each sub quadrat inner ring knife sampling for 3 times), midpoint sampling of 9 small quadrats in farmland quadrats, encryption of No. 5 quadrat in the center, and measurement of 4 corner points (each measuring point ring knife sampling for 1 time, Ml2x soil moisture meter (1 observation). 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 quadrat and observation times: in the east-west and North-South transects of the desert, each small quadrat shall be sampled several times at the time of aircraft transit; Wulidun farmland quadrat shall be sampled twice every 15m from east to west at the time of aircraft transit. 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; 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.
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 25, 2008, L & amp was carried out in the desert East-West transect, desert north-south transect and wulidun farmland transect in the intensive observation area of Linze station; K-band airborne microwave radiometer ground synchronous observation was carried out to observe soil moisture, surface radiation temperature and multi angle reflectance
1. Soil moisture observation. Desert East-West sample zone (including 40 sub quadrats, each sub quadrat corner point is sampled once by ring knife), desert north-south sample zone (including 9 sub quadrats, each sub quadrat inner ring knife is sampled three times), the midpoint of 9 small quadrats in the farmland quadrat is sampled, the No. 5 quadrat in the center is encrypted, and 4 corner points are also measured (each measuring point is sampled once by ring knife, and ml2x soil moisture velocity meter is observed once).
2. Observation of surface radiation temperature. In the east-west and North-South transects of the desert, each small transect is sampled several times at the time of aircraft transit; Wulidun farmland quadrat shall be sampled twice every 15m from east to west at the time of aircraft transit. 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.
3. BRDF observation. 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
Good data quality
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CSTR:11738.11.ncdc.NIEER.2021.1798
10.12072/ncdc.NIEER.db1852.2022
