From 11:20 to 12:30 on March 19, 2008, BJT conducted the aviation flight test of airborne LK band airborne microwave radiometer. The observation angle of the microwave radiometer is vertical to the surface. Surface parameters include surface radiation temperature, surface physical temperature, weight water content of 0-1cm, 1-3cm and 3-5cm of soil profile (drying and weighing method), and freezing and thawing status of surface soil (expressed by freezing and thawing depth). The main purpose is to observe the effects of soil water content, freezing and thawing on microwave radiation.
1) The measurement method of soil freezing and thawing depth is to judge the freezing and thawing depth by inserting chopsticks into the surface to feel the soil hardness or directly digging out the frozen layer on the surface of the soil to measure the thickness of the frozen layer. Measured directly with a ruler, when the soil hardness is large and there are ice crystals, it is considered that the soil is frozen; On the contrary, it is considered that the soil is not frozen. Data can be opened with Microsoft office software.
2) The surface radiation temperature and physical temperature are measured by hand-held infrared thermometer, and the short-range measurement mode is adopted. The surface physical temperature adopts the thermocouple thermometer attached to the hand-held infrared thermometer (needle platinum resistance thermometer is also used at some sample points). Data can be opened with Microsoft office software.
3) The soil moisture measurement method is: take 0-1cm, 1-3cm and 3-5cm soil samples, put them into self sealing bags, and then dry them in microwave oven to calculate the soil weight and water content. The volumetric water content of the soil can be calculated from the bulk density data. Data can be opened with Microsoft office software.
4) In the process of ground synchronous measurement, the ground surface condition and surrounding environment condition of each measurement point are photographed, which can be used as a reference for data analysis and use. The file format is. Jpg.
This data set includes K-band microwave radiometer data, L-band microwave radiometer data, soil freezing and thawing depth data, soil moisture data, surface temperature data and surface condition data.
The measurement method of soil freezing and thawing depth is to judge the freezing and thawing depth by inserting chopsticks into the surface to feel the soil hardness or directly digging out the frozen layer on the surface of the soil to measure the thickness of the frozen layer. The surface radiation temperature and physical temperature are measured by hand-held infrared thermometer, and the short-range measurement mode is adopted. The soil moisture measurement method is to take soil samples (0-1cm, 1-3cm, 3-5cm) and dry them in microwave oven to calculate the soil weight and water content.
1) The measurement method of soil freezing and thawing depth is to judge the freezing and thawing depth by inserting chopsticks into the surface to feel the soil hardness or directly digging out the frozen layer on the surface of the soil to measure the thickness of the frozen layer. Measured directly with a ruler, when the soil hardness is large and there are ice crystals, it is considered that the soil is frozen; On the contrary, it is considered that the soil is not frozen. Data can be opened with Microsoft office software.
2) The surface radiation temperature and physical temperature are measured by hand-held infrared thermometer, and the short-range measurement mode is adopted. The surface physical temperature adopts the thermocouple thermometer attached to the hand-held infrared thermometer (needle platinum resistance thermometer is also used at some sample points). Data can be opened with Microsoft office software.
3) The soil moisture measurement method is: take 0-1cm, 1-3cm and 3-5cm soil samples, put them into self sealing bags, and then dry them in microwave oven to calculate the soil weight and water content. The volumetric water content of the soil can be calculated from the bulk density data. Data can be opened with Microsoft office software.
4) In the process of ground synchronous measurement, the ground surface condition and surrounding environment condition of each measurement point are photographed, which can be used as a reference for data analysis and use. The file format is. Jpg.
Good data quality
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CSTR:11738.11.ncdc.NIEER.2021.1834
10.12072/ncdc.NIEER.db1866.2022