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	A New Method of Accurately Extracting Spectral Values for Discrete Sampling Points
	Lue Zhen-zhen; Liu Guang-ming; Yang Jin-song
刊名	SPECTROSCOPY AND SPECTRAL ANALYSIS
	2015-08-01
卷号	35期号:8页码:2083-2086
关键词	Remote sensing Piyel Sampling points Spectrum Extraction
ISSN号	1000-0593
DOI	10.3964/j.issn.1000-0593(2015)08-2083-04
通讯作者	Liu Guang-ming(gmliu@issas.ac.cn)
英文摘要	In the establishment of remote sensing information inversion model, the actual measured data of discrete sampling points and the corresponding spectrum data to pixels of remote sensing image, are used to establish the relation, thus to realize the goal of information retrieval. Accurate extraction of spectrum value is very important to establish the remote sensing inversion mode. Converting target spot layer to ROI (region of interest) and then saving the ROT as ASCII is one of the methods that researchers often used to extract the spectral values. Analyzing the coordinate and spectrum values extracted using original coordinate in ENVI, we found that the extracted and original coordinate were not inconsistent and part of spectrum values not belong to the pixel containing the sampling point. The inversion model based on the above information cannot really reflect relationship between the target properties and spectral values; so that the model is meaningless. We equally divided the pixel into four parts and summed up the law. It was found that only when the sampling points distributed in the upper left corner of pixels, the extracted values were correct. On the basis of the above methods, this paper systematically studied the principle of extraction target coordinate and spectral values, and summarized the rule. A new method for extracting spectral parameters of the pixel that sampling point located in the environment of ENVI software. Firstly, pixel sampling point coordinates for any of the four corner points were extracted by the sample points with original coordinate in ENVI. Secondly, the sampling points were judged in which partition of pixel by comparing the absolute values of difference longitude and latitude of the original and extraction coordinates. Lastly, all points were adjusted to the upper left corner of pixels by symmetry principle and spectrum values were extracted by the same way in the first step. The results indicated that the extracted spectrum values of all points were accurate. Experiment on OLI (Operational Land Imager), TM and ETM+ images showed that this method can accurately extract the discrete spectrum value, and as well, clear principle, simple and feasible operation, strong applicability, This paper provides a new idea for remote sensing image extraction of discrete point spectrum.
收录类别	SCI
WOS研究方向	Spectroscopy
WOS类目	Spectroscopy
语种	英语
出版者	OFFICE SPECTROSCOPY & SPECTRAL ANALYSIS
WOS记录号	WOS:000359272300004
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558339
专题	南京土壤研究所
通讯作者	Liu Guang-ming
作者单位	Chinese Acad Sci, State Key Lab Soil & Sustainable Agr, Inst Soil Sci, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Lue Zhen-zhen,Liu Guang-ming,Yang Jin-song. A New Method of Accurately Extracting Spectral Values for Discrete Sampling Points[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2015,35(8):2083-2086.
APA	Lue Zhen-zhen,Liu Guang-ming,&Yang Jin-song.(2015).A New Method of Accurately Extracting Spectral Values for Discrete Sampling Points.SPECTROSCOPY AND SPECTRAL ANALYSIS,35(8),2083-2086.
MLA	Lue Zhen-zhen,et al."A New Method of Accurately Extracting Spectral Values for Discrete Sampling Points".SPECTROSCOPY AND SPECTRAL ANALYSIS 35.8(2015):2083-2086.

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