%0 Dataset
%T Heihe River Integrated Remote Sensing joint test: ENVISAT ASAR ground synchronous observation data set in ARW encrypted observation area (July 5-6, 2008)
%J National Cryosphere Desert Data Center
%I National Cryosphere Desert Data Center(www.ncdc.ac.cn)
%U http://www.ncdc.ac.cn/portal/metadata/4a66f71b-c13f-42e9-b580-6f9732311d51
%W NCDC
%R 10.12072/ncdc.nieer.db2996.2023
%A Jin rui
%A Gai yingchun
%A Ma mingguo
%A Wang Yang
%K GPR ground penetrating radar;ground synchronous observation;snow density;snow particle size;ASAR;surface temperature;snow albedo;soil freezing and thawing;snow;ASD spectrometer;sample plot biomass;snow spectrum;snow surface temperature;wet soil moisture meter;snow layer temperature;needle thermometer;soil moisture;pogo portable soil moisture sensor;soil temperature;surface radiation temperature;dielectric constant;ml2x soil moisture meter;Snow soil interface temperature;BRDF data;canopy spectral reflectance;fish eye photos;hand-held microscope;photosynthetic data;hand-held infrared thermometer;PR2 soil profile moisture meter;soil conductivity
%X 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