On March 19, 2008, for the aviation flight of LK band airborne microwave radiometer, the ground synchronous observation was carried out in flexible belt 2, flexible belt 4 and flexible belt 5. All transects are north-south oriented, and the spacing of sampling points on each transect is about 100m. In synchronization, it travels from north to south.
In flexible sample zone 2, pogo portable soil moisture sensor is used to obtain the real and imaginary parts of soil temperature, soil volume water content, loss tangent, soil conductivity and soil complex dielectric constant; Needle thermometer to obtain 0-5cm average soil temperature; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the weight water content, soil bulk density and volume water content.
In a flexible sample zone 4, pogo portable soil moisture sensor is used to obtain the real and imaginary parts of soil temperature, soil volume water content, loss tangent, soil conductivity and soil complex dielectric constant; Needle thermometer to obtain 0-5cm average soil temperature; The hand-held infrared thermometer obtains the surface radiation temperature for 3 times; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the weight water content, soil bulk density and volume water content.
The ml2x soil moisture meter was used to obtain the soil volume water content in a flexible sample zone 5; Needle thermometer to obtain 0-5cm average soil temperature; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the weight water content, soil bulk density and volume water content.
For surface roughness information, please refer to the metadata of "Heihe integrated remote sensing joint test: surface roughness data set of Aru encrypted observation area". In addition, synchronous observation of handheld thermal imager was carried out in flexible belt 4 and GPR monitoring was carried out in flexible belt 6.
（ 1) In flexible sample zone 2, pogo portable soil moisture sensor is used to obtain the real and imaginary parts of soil temperature, soil volume water content, loss tangent, soil conductivity and soil complex dielectric constant.
（ 2) In flexible sample zone 4, pogo portable soil moisture sensor is used to obtain the real and imaginary parts of soil temperature, soil volume water content, loss tangent, soil conductivity and soil complex dielectric constant.
（ 3) The ml2x soil moisture meter was used to obtain the soil volume water content in flexible sample zone 5.
（ 1) Needle thermometer to obtain 0-5cm average soil temperature; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the weight water content, soil bulk density and volume water content.
（ 2) Needle thermometer to obtain 0-5cm average soil temperature; The hand-held infrared thermometer obtains the surface radiation temperature for 3 times; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the weight water content, soil bulk density and volume water content.
（ 3) Needle thermometer to obtain 0-5cm average soil temperature; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the weight water content, soil bulk density and volume water content.
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CSTR:11738.11.ncdc.Westdc.2021.824
10.12072/ncdc.NIEER.db1916.2022