%0 Dataset
%T Heihe integrated remote sensing joint test: MODIS ground synchronous observation data set in biandukou encrypted observation area (March 12, 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/7efa614e-a358-4bd5-ae69-b74f9c2afd6e
%W NCDC
%R 10.12072/ncdc.NIEER.db1913.2022
%A Zhao Shaojie
%A Ren Huazhong
%A Chetao
%K Surface radiation temperature;soil freezing depth;soil physical temperature;MODIS;soil moisture;ground synchronous observation;handheld infrared thermometer;soil moisture;moisture content
%X On March 12, 2008, MODIS ground synchronous observation was carried out in the intensive observation area of biandukou. The survey quadrats include biandukou C1 sample plot, biandukou G1 sample plot and biandukou B2 sample plot. The contents of ground observation include surface radiation temperature, physical temperature, ground cover type and soil moisture.1) Surface radiation temperature: measured at sample plot C1, sample plot G1 and sample plot B2 of biandukou, and the measurement time range is 11:30-12:15. The bread under the quadrat includes deep ploughing, rape stubble and grassland. The measuring instrument is a hand-held infrared thermometer, which adopts short-range measurement mode. The surface physical temperature adopts the thermocouple thermometer attached to the hand-held infrared thermometer. The soil roughness data can be considered as unchanged during the test and can be obtained from the roughness data set at other times. 2) Soil moisture content: take 0-1cm, 1-3cm, 3-5cm, 5-10cm and 10-20cm soil samples, put them into self sealing bags, and then dry them in microwave oven to calculate the soil weight moisture content. 3) The measurement of soil freezing depth is to judge the freezing depth by inserting chopsticks into the soil to feel its hardness or directly digging out the frozen layer on the surface of the soil and measuring 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. The surface coverage is measured and stored in the form of photos. This data includes four files: MODIS data, Biandu port B2 sample measurement data, Biandu port C1 sample measurement data and Biandu port G1 sample measurement data. The biandukou B2 sample plot file contains surface temperature, freezing depth data and soil water content data. The survey data of C1 sample plot in biandukou incl