On May 24, 2008, ENVISAT ASAR and alos PALSAR satellite ground synchronous observations were carried out at Linze station, including soil moisture, surface radiation temperature and manual Lai. ENVISAT ASAR data has been obtained, alos PALSAR data has not been obtained. ENVISAT ASAR data is AP mode, VV / VH polarization combination mode, and the transit time is about 11:34bjt.
1. Soil moisture observation. Observation target: 0-5cm topsoil. Observation instrument: ring knife (volume 50cm ^ 3), ml2x soil moisture rapid tester. Observation quadrats and observation times: Desert East-West sample zone (including 40 sub quadrats, one sampling for each sub quadrat corner), desert north-south sample zone (including 9 sub quadrats, one sampling for each sub quadrat center point), observation at the midpoint of 9 small quadrats in wulidun corn field, densification of No. 5 quadrat in the center, and observation at 4 corners (one sampling for each observation point, Ml2x soil moisture meter repeated observation for 3 times, and the pretreatment data is soil volume water content. Data storage: Excel.
2. Observation of surface radiation temperature. Observation instrument: hand held infrared thermometer (cold and drought Institute 5#, cold and drought Institute 6#), and the instruments have been calibrated (please refer to the calibration data of hand-held thermal radiometer. XLS). Observation quadrats and observation times: Desert East-West sample zone (including 40 sub quadrats, each sub quadrat 14-30 repetitions), desert north-south sample zone (including 9 sub quadrats, each sub quadrat 12-30 repetitions). 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. Manually measure Lai. Observation quadrat: wulidun farmland quadrat and Linze station quadrat. Observation items: Lai, plant height and spacing. Lai observation scheme: (1) 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 to obtain the daily Lai observation average value of the observed quadrat（ 2) Lai was observed using li-3100. Plant height measurement scheme: measure the height of male and female parents of seed Maize in the quadrat with a tape measure. Spacing measurement scheme: measure the row spacing, plant spacing and ridge spacing of male and female parents of seed maize with tape. Storage method: this data is processed data, and the file format is excel.
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 24, 2008, ENVISAT ASAR and alos PALSAR satellite ground synchronous observations were carried out at Linze station, including soil moisture, surface radiation temperature and manual Lai. ENVISAT ASAR data has been obtained, alos PALSAR data has not been obtained.
ENVISAT ASAR data is AP mode, VV / VH polarization combination mode, and the transit time is about 11:34bjt
Soil moisture observation. Observation target: 0-5cm topsoil. Observation instrument: ring knife (volume 50cm ^ 3), ml2x soil moisture rapid tester. Observation quadrats and observation times: Desert East-West sample zone (including 40 sub quadrats, one sampling for each sub quadrat corner), desert north-south sample zone (including 9 sub quadrats, one sampling for each sub quadrat center point), observation at the midpoint of 9 small quadrats in wulidun corn field, densification of No. 5 quadrat in the center, and observation at 4 corners (one sampling for each observation point, Ml2x soil moisture meter repeated observation for 3 times, and the pretreatment data is soil volume water content. Data storage: Excel
Surface radiation temperature observation. Observation instrument: hand held infrared thermometer (cold and drought Institute 5#, cold and drought Institute 6#), and the instruments have been calibrated (please refer to the calibration data of hand-held thermal radiometer. XLS).
Observation quadrats and observation times: Desert East-West sample zone (including 40 sub quadrats, each sub quadrat 14-30 repetitions), desert north-south sample zone (including 9 sub quadrats, each sub quadrat 12-30 repetitions). 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
Manually measure Lai. Observation quadrat: wulidun farmland quadrat and Linze station quadrat. Observation items: Lai, plant height and spacing. Lai observation scheme:
（ 1) 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 to obtain the daily Lai observation average value of the observed quadrat;
（ 2) Lai was observed using li-3100. Plant height measurement scheme: measure the height of male and female parents of seed Maize in the quadrat with a tape measure. Spacing measurement scheme: measure the row spacing, plant spacing and ridge spacing of male and female parents of seed maize with tape. Storage method: this data is processed data, and the file format is excel
Good data quality
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CSTR:11738.11.ncdc.NIEER.2021.1812
10.12072/ncdc.NIEER.db1863.2022