An Experimental Study on Field Spectral Measurements to Determine Appropriate Daily Time for Distinguishing Fractional Vegetation Cover
文献类型：期刊论文
| 作者 | Lyu, Du1,2; Liu, Baoyuan1,3; Zhang, Xiaoping1,3; Yang, Xihua4; He, Liang3; He, Jie3; Guo, Jinwei3; Wang, Jufeng3; Cao, Qi1 |
| 刊名 | REMOTE SENSING
 |
| 出版日期 | 2020-09-01 |
| 卷号 | 12期号:18页码:14 |
| 关键词 | fractional vegetation cover field spectral measurement spectral indices appropriate measurement time |
| DOI | 10.3390/rs12182942 |
| 通讯作者 | Zhang, Xiaoping(zhangxp@ms.iswc.ac.cn) |
| 英文摘要 | Remote sensing technology has been widely used to estimate fractional vegetation cover (FVC) at global and regional scales. Accurate and consistent field spectral measurements are required to develop and validate spectral indices for FVC estimation. However, there are rarely any experimental studies to determine the appropriate times for field spectral measurements, and the existing guidelines or references are rather general or inconsistent, it is still not agreed upon and detailed experiments are missing for a local research. In this experiment, five groundcover objects were measured continuously from 07:30 a.m. to 17:30 p.m. local time in three consecutive sunny days using a portable spectrometer. The coefficients of variation (CV) were applied to investigate the reflectance variation at wavelengths corresponding to MODIS satellite channels and the derived spectral indices used to estimate FVC, including photosynthetic vegetation (PV) and non-photosynthetic vegetation (NPV). The results reveal little variation in the reflectance measured between 10:00 a.m. and 16:00 p.m., with CV values generally less than 10%. The CV values of FVC spectral indices for estimating PV, NPV and bare soil (BS) are generally less than 3%. While more experiments are yet to be carried out at different locations and in different seasons, the findings so far imply that the in situ spectrum measured between 9:00 a.m. and 17:00 p.m. local time would be useful to discriminate FVC objects and validate satellite estimates-based indices using visible, near-infrared and shortwave infrared channels. |
| WOS关键词 | PHOTOSYNTHETIC VEGETATION ; NONPHOTOSYNTHETIC VEGETATION ; BARE SOIL ; REFLECTANCE ; CALIBRATION ; IRRADIANCE ; RETRIEVALS ; RADIANCE ; INDEX ; NDVI |
| 资助项目 | Strategic Priority Research Program of Chinese Academy of Sciences[XDA 20040202] ; National Natural Science Foundation of China[41877083] |
| WOS研究方向 | Remote Sensing |
| 语种 | 英语 |
| WOS记录号 | WOS:000580744500001 |
| 出版者 | MDPI |
| 资助机构 | Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/157191]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Zhang, Xiaoping |
| 作者单位 | 1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 4.New South Wales Dept Planning Ind & Environm, Parramatta, NSW 2124, Australia |
| 推荐引用方式 GB/T 7714 | Lyu, Du,Liu, Baoyuan,Zhang, Xiaoping,et al. An Experimental Study on Field Spectral Measurements to Determine Appropriate Daily Time for Distinguishing Fractional Vegetation Cover[J]. REMOTE SENSING,2020,12(18):14. |
| APA | Lyu, Du.,Liu, Baoyuan.,Zhang, Xiaoping.,Yang, Xihua.,He, Liang.,...&Cao, Qi.(2020).An Experimental Study on Field Spectral Measurements to Determine Appropriate Daily Time for Distinguishing Fractional Vegetation Cover.REMOTE SENSING,12(18),14. |
| MLA | Lyu, Du,et al."An Experimental Study on Field Spectral Measurements to Determine Appropriate Daily Time for Distinguishing Fractional Vegetation Cover".REMOTE SENSING 12.18(2020):14. |
入库方式： OAI收割
来源：地理科学与资源研究所
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