TY  - Data
T1  - Heihe comprehensive remote sensing joint experiment: spectral reflectance observation data set of Yingke oasis and huazhaizi desert intensive observation area (2008)
A1  - Ren Huazhong
DO  - 10.12072/ncdc.NIEER.db1773.2022
PY  - 2022
DA  - 2022-03-14
PB  - National Cryosphere Desert Data Center
AB  - This data includes spectral reflectance and BRDF data sets measured in Yingke oasis and huazhaizi desert intensive observation area. Data measurement began on May 20, 2008. Measuring instrument and principle: ASD (analytical Sepctral devices) spectrometer was used to measure the reflectivity of Yingke oasis and huazhaizi desert intensive observation area and typical features in the observation area. 1. Basic principle of measurement: 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. Survey content: survey sample plots and data types: Yingke oasis corn plot, Yingke wheat plot, huazhaizi desert corn plot, huazhaizi desert sample plot 1, huazhaizi desert sample plot 2, Linze grassland intensive observation area, biandukou intensive observation area, etc. Among them, the main measuring points of corn field in Yingke oasis are corn canopy spectrum, wheat canopy spectrum, strip spectrum and several times of corn leaf component spectrum. BRDF of corn field was measured many times in this sample plot. Huazhaizi desert sample 1 and huazhaizi desert sample 2 mostly adopt strip measurement, and there is no real component spectrum. Yingke wheat field and huazhaizi desert corn field and other experimental areas are also mostly canopy and band spectra.& emsp; Measuring instruments: there are four ASD spectrometers before and after Yingke oasis and huazhaizi desert, i.e. one for Peking University, Institute of remote sensing application, Chinese Academy of Sciences, Beijing Academy of agricultural and Forestry Sciences and Beijing Normal University. The ASD spectrometer of Peking University and Institute of remote sensing applications, Chinese Academy of Sciences, with a wavelength of 350-2500 nm, is the main measuring instrument; The ASD wavelength of Beijing Academy of agricultural and Forestry Sciences is 350-1065n
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/2d05db0f-04c5-4c4d-bfbe-a570eee2144f
ER  -