黑河综合遥感联合试验：盈科绿洲与花寨子荒漠加密观测区光谱反射率观测数据集

本数据包括在盈科绿洲与花寨子荒漠加密观测区测量的光谱反射率与BRDF数据集。数据测量从2008年5月20号开始。
测量仪器与原理：
利用ASD（Analytical Sepctral Devices）光谱仪测量了盈科绿洲与花寨子荒漠加密观测区及其观测区典型地物的反射率。 1. 测量基本原理为：R =（DN1/DN0）×R0。式中R0和DN0分别为参考反射灰板的定标光谱反射率和测量所得DN值；DN1为测量目标所得DN值。
测量内容：
测量样地与数据类型：盈科绿洲玉米地、盈科小麦地、花寨子荒漠玉米地、花寨子荒漠样地1，花寨子荒漠样地2，以及临泽草地加密观测区、扁都口加密观测区等。其中，盈科绿洲玉米地主要测量点，测量对象为玉米冠层光谱、小麦冠层光谱和条带光谱以及若干次玉米叶片组分光谱。在该样地还多次进行了玉米地BRDF的测量。花寨子荒漠样地1与花寨子荒漠样地2多采用条带测量方式，没有真正意义的组分光谱。盈科小麦地与花寨子荒漠玉米地与其他试验区也多为冠层和条带光谱。
测量仪器：盈科绿洲与花寨子荒漠前后共计4台ASD光谱仪，即北京大学、中国科学院遥感应用研究所、北京农林科学院和北京师范大学各自1台。其中北京大学和中国科学院遥感应用研究所的ASD光谱仪波长为350-2500nm，为主要测量仪器；北京农林科学院的ASD波长为350-1065nm，在试验前期用于卫星或飞行同步光谱在荒漠样地测量。北京师范大学的ASD光谱仪只测量了2008年05月20日花寨子荒漠样地2光谱数据。参考反射率板有40%，50%和99%。前两者为实际测量参考对象，后者主要用于仪器间相互比对。
测量日期：
2008-05-20， 2008-05-24， 2008-05-25， 2008-05-28， 2008-05-30， 2008-06-01， 2008-06-04， 2008-06-09， 2008-06-14， 2008-06-16， 2008-06-18， 2008-06-20， 2008-06-22， 2008-06-23， 2008-06-24， 2008-06-26， 2008-06-29， 2008-06-30， 2008-07-01， 2008-07-04， 2008-07-05， 2008-07-06， 2008-07-07， 2008-07-09， 2008-07-11。 2008-07-11为光谱仪之间的比对试验， 其中以下日期为北京大学和中国科学院遥感应用研究所的两台仪器在不同样地测量：2008-05-28，2008-06-16，2008-06-23；测量数据配合机载红外广角双模式成像仪WiDAS（Wide-angle Infrared Dual-mode line/area Array Scanner）航空飞行、成像光谱仪OMIS-II航空飞行以及多种星载传感器。
数据处理：
包括原始数据与记录数据、处理后的反射率数据。 原始数据为ASD光谱仪标准格式，可利用其自带软件ViewSpec打开，本分数据集已导出为Excel格式。处理后的反射率数据以Excel格式保存。

This dataset comprises spectral reflectance and Bidirectional Reflectance Distribution Function (BRDF) measurements conducted in the intensive observation areas of the Yingke Oasis and Huazhaizi Desert. Field measurements commenced on May 20, 2008.

Measurement Instruments and Principles:
Reflectance of typical surface features within the intensive observation areas of the Yingke Oasis and Huazhaizi Desert was measured using ASD (Analytical Spectral Devices) spectrometers. 1. The basic measurement principle is expressed as: $R = (DN_1/DN_0) \times R_0$, where $R_0$ and $DN_0$ are the calibrated spectral reflectance and the measured DN value of the reference reflectance grey panel, respectively; $DN_1$ is the measured DN value of the target object.

Measurement Contents:
Measurement Plots and Data Types: The survey covers the Yingke Oasis maize field, Yingke Oasis wheat field, Huazhaizi Desert maize field, Huazhaizi Desert Plot 1, Huazhaizi Desert Plot 2, Linze Grassland Intensive Observation Area, Biandukou Intensive Observation Area, and other relevant areas. For the Yingke Oasis maize field, the main measurement sites include maize canopy spectra, wheat canopy spectra, strip spectra, and multiple sets of maize leaf component spectra. Multiple BRDF measurements of the maize field were also conducted at this plot. Huazhaizi Desert Plot 1 and Plot 2 mostly adopted strip measurement methods, without genuine component spectra. The Yingke wheat field, Huazhaizi Desert maize field, and other experimental zones also mainly collected canopy and strip spectra.

Measurement Instruments:
A total of 4 ASD spectrometers were used for measurements in the Yingke Oasis and Huazhaizi Desert, with one unit each belonging to Peking University, the Institute of Remote Sensing Applications of the Chinese Academy of Sciences, the Beijing Academy of Agriculture and Forestry Sciences, and Beijing Normal University. The ASD spectrometers from Peking University and the Institute of Remote Sensing Applications of the Chinese Academy of Sciences, with a spectral range of 350–2500 nm, served as the primary measurement instruments. The ASD spectrometer of the Beijing Academy of Agriculture and Forestry Sciences, with a spectral range of 350–1065 nm, was used in the early stage of the experiment for synchronous spectral measurements of desert plots with satellite or airborne sensors. The ASD spectrometer of Beijing Normal University only collected spectral data of Huazhaizi Desert Plot 2 on May 20, 2008. There are three types of reference reflectance grey panels with reflectance values of 40%, 50%, and 99%. The first two were used as actual reference objects for measurements, while the 99% panel was mainly used for inter-instrument calibration.

Measurement Dates:
The measurement dates are as follows: 2008-05-20, 2008-05-24, 2008-05-25, 2008-05-28, 2008-05-30, 2008-06-01, 2008-06-04, 2008-06-09, 2008-06-14, 2008-06-16, 2008-06-18, 2008-06-20, 2008-06-22, 2008-06-23, 2008-06-24, 2008-06-26, 2008-06-29, 2008-06-30, 2008-07-01, 2008-07-04, 2008-07-05, 2008-07-06, 2008-07-07, 2008-07-09, 2008-07-11. July 11, 2008 was used for an inter-instrument calibration experiment. Measurements on May 28, 2008, June 16, 2008, and June 23, 2008 were conducted using two ASD spectrometers from Peking University and the Institute of Remote Sensing Applications of the Chinese Academy of Sciences at different plots. The measured data were matched with airborne flights of the Wide-angle Infrared Dual-mode line/area Array Scanner (WiDAS) and airborne imaging spectrometer OMIS-II, as well as multiple space-borne sensors.

Data Processing:
The dataset includes raw and recorded data, as well as processed reflectance data. The raw data are in the standard format of ASD spectrometers, which can be opened using their bundled software 'ViewSpec'. This subset has been exported to Excel format. The processed reflectance data are saved in Excel format.

搜集汇总

背景与挑战

背景概述

该数据集是黑河综合遥感联合试验的一部分，聚焦于盈科绿洲与花寨子荒漠加密观测区，于2008年6月至8月期间利用ASD光谱仪测量了光谱反射率与BRDF数据，覆盖玉米地、小麦地、荒漠样地等多种典型地物。数据包括原始和处理后的反射率，以Excel格式提供，旨在支持遥感地面验证和生态水文研究。