TY  - Data
T1  - Heihe River eco hydrological remote sensing experiment: BRDF observation data set in the middle reaches of Heihe River Basin (2018)
A1  - Xiao qing
A1  - Ma mingguo
DO  - 10.12072/ncdc.nieer.db2857.2023
PY  - 2021
DA  - 2021-09-14
PB  - National Cryosphere Desert Data Center
AB  - This data is the corn field of Daman super station (longitude and latitude of measuring point: 100.372 ° e, 38.855 ° n); Time: June 29, 2012) and desert near the airport (longitude and latitude of measuring point: 100.700 ° e, 38.762 ° n; Date: July 8, 2012) Measuring instrument: svc-hr1024 spectrometer and reference plate of Institute of remote sensing, Chinese Academy of Sciences, multi angle automatic observation frame developed by Beijing Normal UniversityMeasurement method: take the observation plane as the unit for measuring multi angle data, that is, after determining the azimuth of the observation plane, measure the spectrum of ground objects with different observation zenith angles under the plane. The observation plane is mainly parallel to the main plane of the sun and vertical to the main plane of the sun. The vertical ridge and parallel ridge are observed in the row sowing corn of Daman station, and there are due south and due north planes in the desert. For each observation plane, observe the zenith angle and measure the directional reflectance between - 60 ° ~ 60 ° at an interval of 10 °. The maximum measurement height of the multi angle observation frame can reach 5m. The svc-hr1024 spectrometer with a field of view of 25 ° is used for observation, and the spectral range is 400nm-2500nm. For each observation plane, first measure the radiance of the reference plate, then aim the spectrometer probe at the ground object, observe the ground object according to the set observation plane every 10 ° zenith angle, and then measure the reference plate after the observation plane is completed. Thus, a measurement of the observation plane is completed BRDF data set includes original data, recorded data and processed BRDF data. The processed data is saved in txt. The file includes angle information and reflectivity information (reflectivity relative to the reference plate), as well as BRDF distribution with observation angle at three wavelengths of each plane
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/553b9192-cfa1-4a5e-874c-426017d5af4e
ER  -