This data comes from the ground synchronous observation test for ENVISAT ASAR data carried out in sample 1, sample 2 and sample 3 of ARW experimental area on July 5, 2008. The observation items include sample survey, surface feature spectrum, BRDF, photosynthetic data, soil moisture and soil temperature. ENVISAT ASAR data on July 5, 2008 was obtained, which is AP mode, VV / VH polarization combination mode, and the transit time is about 11:14bjt. This data can provide a basic ground data set for the development and verification of ENVISAT ASAR remote sensing inversion of soil moisture. A rou sample 1, a rou sample 2 and a rou sample 3 are 4grid × 4grid, 30m per grid × 30m。
1. Quadrat survey: a rou quadrat 2 and a rou quadrat 3. Survey contents: GPS location, species, quantity, natural height, phenology, coverage and chlorophyll.
（ 1) GPS point number, recorded with Garmin GPS 76.
（ 2) Species were identified manually.
（ 3) The quantity adopts the method of labor quantity.
（ 4) The natural height shall be measured with a tape measure, with 4-5 repetitions.
（ 5) Phenological sampling and manual estimation method.
（ 6) The coverage is 50cm × 50cm grid, the grid size is 5cm × 5cm, manual estimation method.
（ 7) The chlorophyll content was measured with SPAD 502 chlorophyll meter, with multiple repetitions.
2. Feature spectrum. Observation instrument: ASD FieldSpec spectrometer, 350 ~ 2500 nm. Reference plate information: 20% reference plate. Observation target: Stellera chamaejasme and herbage. Data storage: preprocessed canopy spectral data.
3. BRDF observation instrument: ASD FieldSpec spectrometer, 350 ~ 2500 nm; Reference board information 20% reference board; The processed reflectivity and transmittance are in text format.
4. Photosynthetic data measuring instrument: Li-6400. Measured objects: Stellera chamaejasme and herbage. Operation specification: please refer to the joint test operation specification for the operation process. Process the data and save it in Excel.
5. Soil moisture measurement method: wet soil moisture quick tester. Number of measuring points: 25 measuring positions: at 30m × Measured on the corner of 30m grid. Record information: sampling time, soil moisture (% vol), ECP (MS / M), TMP EB, ECB (MS / M).
6. Soil temperature measurement method: hand held infrared thermometer. Number of measuring points: 25 measuring positions: at 30m × Measured on the corner of 30m grid. Record information: sampling time, infrared temperature repeated for 3 times, description of surface coverage type.
The dataset includes:
（ 1) Canopy spectral reflectance data on July 5 and July 6;
（ 2) Photosynthetic data on July 5 and July 6;
（ 3) BRDF data on July 5
（ 4) Fish eye camera took photos on July 5
（ 5) Data of infrared surface temperature and wet soil moisture on July 5
（ 6) Biomass data of sample plot on July 5
（ 7) Surface temperature data of the third route quadrat on July 6
The ground synchronous observation test for ENVISAT ASAR data includes quadrat survey, surface feature spectrum, BRDF, photosynthetic data, soil moisture and soil temperature. ENVISAT ASAR data is obtained, which is AP mode, VV / VH polarization combination mode, and the transit time is about 11:14bjt. This data can provide a basic ground data set for the development and verification of ENVISAT ASAR remote sensing inversion of soil moisture. A rou sample 1, a rou sample 2 and a rou sample 3 are 4grid × 4grid, 30m per grid × 30m。
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.
Pogo portable soil moisture sensor was used to obtain the real and imaginary parts of soil temperature, soil volume moisture content, loss tangent, soil conductivity and soil complex dielectric constant; Needle thermometer to obtain 0-5cm average soil temperature; The hand-held thermal 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 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 in arrou quadrat 3; Ml2x soil moisture quick tester obtains soil volume water content; Needle thermometer to obtain 0-5cm average soil temperature; The hand-held thermal 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.
Quadrat survey: a rou quadrat 2 and a rou quadrat 3. Survey contents: GPS location, species, quantity, natural height, phenology, coverage and chlorophyll（ 1) GPS point number, recorded with Garmin GPS 76（ 2) Species were identified manually（ 3) The quantity adopts the method of labor quantity（ 4) The natural height shall be measured with a tape measure, with 4-5 repetitions（ 5) Phenological sampling and manual estimation method（ 6) The coverage is 50cm × 50cm grid, the grid size is 5cm × 5cm, manual estimation method（ 7) The chlorophyll content was measured with SPAD 502 chlorophyll meter, with multiple repetitions.
Observation instrument: ASD FieldSpec spectrometer, 350 ~ 2500 nm. Reference plate information: 20% reference plate. Observation target: Stellera chamaejasme and herbage. Data storage: preprocessed canopy spectral data.
BRDF observation instrument: ASD FieldSpec spectrometer, 350 ~ 2500 nm; Reference board information 20% reference board; The processed reflectivity and transmittance are in text format.
Photosynthetic data measuring instrument: Li-6400. Measured objects: Stellera chamaejasme and herbage. Operation specification: please refer to the joint test operation specification for the operation process. Process the data and save it in Excel.
Soil moisture measurement method: wet soil moisture rapid tester. Number of measuring points: 25 measuring positions: at 30m × Measured on the corner of 30m grid. Record information: sampling time, soil moisture (% vol), ECP (MS / M), TMP EB, ECB (MS / M).
Soil temperature measurement method: hand held infrared thermometer. Number of measuring points: 25 measuring positions: at 30m × Measured on the corner of 30m grid. Record information: sampling time, infrared temperature repeated for 3 times, description of surface coverage type.
Good data quality
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CSTR:11738.11.ncdc.NIEER.2021.1849
10.12072/ncdc.nieer.db2996.2023