中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共3条，第1-3条

帮助

条数/页：排序方式：
	An Experimental Study on Field Spectral Measurements to Determine Appropriate Daily Time for Distinguishing Fractional Vegetation Cover 期刊论文 OAI收割 REMOTE SENSING, 2020, 卷号: 12, 期号: 18, 页码: 14 作者: Lyu, Du; Liu, Baoyuan; Zhang, Xiaoping; Yang, Xihua; He, Liang \| 收藏 \| 浏览/下载：27/0 \| 提交时间：2021/03/16 fractional vegetation cover field spectral measurement spectral indices appropriate measurement time
	Modulation transfer function measurement of sampled imaging systems in field test (EI CONFERENCE) 会议论文 OAI收割 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China 作者: Yang L.; Zhang J.; Zhang J.; Zhang J.; Wang J. 收藏 \| 浏览/下载：30/0 \| 提交时间：2013/03/25 A digital mirror device (DMD) based light projector was developed as the target generator in modulation transfer function (MTF) measurement. In order to overcome the sampling-scene phase effect in MTF measurement of sampled imaging systems a method using random targets is introduced to yield a phase-averaged MTF. The main potential problem of implementing this method is the fact that the stationary assumption of the random targets may be vitiated in practical measurement especially in field test due to the ill condition. We provide an efficient model-independent way of analyzing and isolating the spectral contents arising from these additional contributions to MTF measurement. Algorithms with adaptive parameter selection were also developed for spectral estimation of the test image in order to overcome the challenge brought by the size limit of the test matrices for one certain field of view derived from the isoplantic region. The MTF measurement of a CCD video imager is used to demonstrate the measurement technique and illustrate the benefits over other methods. In order to validate the results comparisons have been made between MTF measurements of imager implemented using this method and bar target direct measurements. 2010 Copyright SPIE - The International Society for Optical Engineering.
	Quantative inversion based on hyperspectral data for soil salinization in the ecological corridor of tarim river, xinjiang,china 会议论文 OAI收割 2008 IEEE International Geoscience and Remote Sensing Symposium, Boston, MA, United states, 2008 Cun; Chang1; 2; Xi; Chen1; Anming; Bao1; Geping; Luo1 收藏 \| 浏览/下载：19/0 \| 提交时间：2011/08/23 Differential equations - Inverse problems - Problem solving - Regression analysis - Remote sensing - Rivers - Salinity measurement - Soils - Field sampling - Field test - Hyperion - HyperSpectral - Hyperspectral Data - Hyperspectral remote sensing - Key factors - Regression model - Sampling methods - Soil salinity - Soil salinization - Spectral estimation - Surface soil - Tarim river - Xinjiang