%0 Dataset
%T Heihe comprehensive remote sensing joint experiment: BRDF observation data set of Yingke oasis and huazhaizi desert intensive observation area (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/947ad780-cb86-4a6c-b836-d7399d627f97
%W NCDC
%R 10.12072/ncdc.NIEER.db1779.2022
%A Ren Huazhong
%K Canopy spectrum;surface feature spectrometer (ASD);vegetation;imaging spectrometer omis-ii;infrared wide-angle dual-mode imager widas;ground remote sensing
%X This data is the BRDF data set measured in Yingke oasis and huazhaizi desert intensive observation area. Data measurement began on May 30, 2008. Measuring instrument and principle: the canopy BRDF of typical features in Yingke oasis and huazhaizi desert intensive observation area was measured by ASD (analytical Sepctral devices) spectrometer. The basic principle of measurement is: r = (DN1 / dn0) × R0。 Where R0 and dn0 are the calibrated spectral reflectance of the reference reflective gray plate and the measured DN value respectively; DN1 is the DN value obtained from the measurement target. Measurement method: the main plane and vertical main plane were mainly observed, and the vertical ridge and parallel ridge were also observed for row sowing corn (Yingke oasis corn field) and wheat (Yingke wheat field). Measure the directional reflectance between - 60 ° and 60 ° at 10 ° intervals. The maximum measurement height of the self-made multi angle observation frame can reach 5m. When the ASD spectrometer with a field of view of 25 ° is used for observation, the ground radius can reach 1.1m, and the observation radius of 2m high corn is 0.67M, which can basically reflect the sowing structure characteristics of ground objects. Measurement time: 2008-05-302008-06-092008-06-142008-06-202008-06-222008-06-262008-06-302008-07-01 synchronized with various airborne (infrared wide-angle dual-mode imager widas, imaging spectrometer omis-ii) and spaceborne sensors. Data processing: BRDF data set includes original data, recorded data and processed BRDF data. The processed data is saved in Excel, and the file includes angle information and reflectivity information.