On March 12, 2008, the ground synchronous observation test of ENVISAT ASAR data was carried out in ajoufang 1, ajoufang 2 and ajoufang 3. ASAR data is AP mode, VV / VH polarization combination mode, and the transit time is about 11:29bjt. Due to the low temperature close to the river valley and the snow has not melted, the Airou sample 2 mainly carries out the synchronous observation test of snow parameters, while the snow of Airou sample 1 and Airou sample 3 has melted, and mainly carries out the synchronous observation test of soil freezing and thawing status and soil moisture.
A rou sample 1, a rou sample 2 and a rou sample 3 are 4grid × 4grid, 30m per grid × 30m。 Ring knife soil sampling is only carried out at the center point of each grid, and other measurements are carried out at the center point and corner point of each grid.
In a rou sample 1, the real and imaginary parts of soil temperature, soil volume water content, loss tangent, soil conductivity and soil complex dielectric constant were obtained by pogo portable soil moisture sensor; Ml2x soil moisture meter obtains soil volume water content; The PR2 soil profile moisture meter obtains 10cm, 20cm, 30cm, 40cm, 60cm and 100cm soil volume moisture content profiles; Needle thermometer to obtain 0-5cm average soil temperature; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the soil weight water content, soil bulk density and volume water content.
Snow parameter observation synchronized with ASAR was carried out in arxo quadrat 2, including synchronous snow surface temperature observation during satellite transit (measured by thermal infrared temperature gun), layered snow layer temperature observation (measured by needle thermometer), snow particle size observation (measured by hand-held microscope), snow density observation (measured by aluminum box), And synchronous temperature measurement of snow surface and snow soil interface (measured by thermal infrared temperature gun); Snow spectral observation (measured by ASD spectrometer); Snow albedo observation (measured by total radiometer).
In a rou quadrat 3, wet soil moisture meter was used to measure the volume water content, conductivity, soil temperature and the real part of soil complex dielectric constant; Needle thermometers (#5 and #7) obtain an average soil temperature of 0-5cm; Hand held infrared thermometer (#5) to obtain surface radiation temperature; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the soil weight water content, soil bulk density and volume water content. For the 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, ground penetrating radar synchronous observation was also carried out in ajoufang 1.
This data can provide a basic ground data set for developing and verifying the algorithm of active microwave remote sensing to retrieve soil moisture and freezing and thawing state, and using GPR data to retrieve soil moisture and freezing depth
On March 12, 2008, the ground synchronous observation test of ENVISAT ASAR data was carried out in ajoufang 1, ajoufang 2 and ajoufang 3. ASAR data is AP mode, VV / VH polarization combination mode, and the transit time is about 11:29bjt. Due to the low temperature close to the river valley and the snow has not melted, the Airou sample 2 mainly carries out the synchronous observation test of snow parameters, while the snow of Airou sample 1 and Airou sample 3 has melted, and mainly carries out the synchronous observation test of soil freezing and thawing status and soil moisture
In a rou sample 1, the real and imaginary parts of soil temperature, soil volume water content, loss tangent, soil conductivity and soil complex dielectric constant were obtained by pogo portable soil moisture sensor; Ml2x soil moisture meter obtains soil volume water content; The PR2 soil profile moisture meter obtains 10cm, 20cm, 30cm, 40cm, 60cm and 100cm soil volume moisture content profiles; Needle thermometer to obtain 0-5cm average soil temperature; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the soil weight water content, soil bulk density and volume water content.
Snow parameter observation synchronized with ASAR was carried out in arxo quadrat 2, including synchronous snow surface temperature observation during satellite transit (measured by thermal infrared temperature gun), layered snow layer temperature observation (measured by needle thermometer), snow particle size observation (measured by hand-held microscope), snow density observation (measured by aluminum box), And synchronous temperature measurement of snow surface and snow soil interface (measured by thermal infrared temperature gun); Snow spectral observation (measured by ASD spectrometer); Snow albedo observation (measured by total radiometer).
In a rou quadrat 3, wet soil moisture meter was used to measure the volume water content, conductivity, soil temperature and the real part of soil complex dielectric constant; Needle thermometers (#5 and #7) obtain an average soil temperature of 0-5cm; Hand held infrared thermometer (#5) to obtain surface radiation temperature; The soil is taken with a 100cm ^ 3 ring knife and dried to obtain the soil weight water content, soil bulk density and volume water content
Good data quality
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CC BY 4.0 (Creative Commons Attribution 4.0 International License).
CSTR:11738.11.ncdc.NIEER.2021.8
10.12072/ncdc.NIEER.db1739.2022
