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	Did ecological engineering projects have a significant effect on large-scale vegetation restoration in Beijing-Tianjin Sand Source Region, China? A remote sensing approach 期刊论文 OAI收割 CHINESE GEOGRAPHICAL SCIENCE, 2016, 卷号: 26, 期号: 2, 页码: 216-228 作者: Li Xiaosong; Wang Hongyan; Zhou Shufang; Sun Bin; Gao Zhihai 收藏 \| 浏览/下载：25/0 \| 提交时间：2017/04/24 SKY RADIANCE MEASUREMENTS OPTICAL-PROPERTIES COAGULATION KERNEL DEPTH CLOUD WATER VARIABILITY PARTICLES INVERSION POLLUTION
	Coastal zone classification with fully polarimetric SAR imagery 期刊论文 OAI收割 IEEE Geoscience and Remote Sensing Letters, 2016, 卷号: 13, 期号: 11, 页码: 1616-1620 作者: Gou, Shuiping; Li, Xiaofeng; Yang, Xiaofeng 收藏 \| 浏览/下载：29/0 \| 提交时间：2017/04/24 SKY RADIANCE MEASUREMENTS OPTICAL-PROPERTIES PHOTOPOLARIMETRIC MEASUREMENTS BIDIRECTIONAL REFLECTANCE SATELLITE-OBSERVATIONS INVERSION ALGORITHM INFORMATION-CONTENT SOLAR IRRADIANCE POLARIZATION SUN
	AEROSOL AND BRDF/ALBEDO INVERSION OVER LAND FROM MSG/SEVIRI DATA 会议论文 OAI收割 2012 Ieee International Geoscience and Remote Sensing Symposium, New York Li, Yingjie; Xue, Yong; Li, Chi; Yang, Leiku; Hou, Tingting; Liu, Jia 收藏 \| 浏览/下载：25/0 \| 提交时间：2014/12/07 aerosol optical depth (AOD) bidirectional reflectance distribution function (BRDF) time series geostationary satellite remote sensing inversion SKY RADIANCE MEASUREMENTS OPTICAL-PROPERTIES REFLECTANCE RETRIEVALS ALGORITHM BRDF SUN
	Research on the laboratory radiometric calibration of the thermal imager (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: Wang J.; Liu Y.; Liu Y.; Liu Y.; Sun Q. 收藏 \| 浏览/下载：26/0 \| 提交时间：2013/03/25 The radiometric calibration of the thermal imager was investigated to build the relationship between the input radiance and the digital output to realize the temperature measurement. The radiometric calibration was implemented in the State Key Laboratory of Applied Optics. A standard black body source was served as radiation source. The response of the thermal imager to the input radiance was tested for different gains. The experimental results show that the average grey level of the output imaging is linear dependence of the input radiance. Because the radiance in the receiving wave range of the thermal imager is linear with the black body's temperature based on Planck's law of radiation the average grey level of the output image is also linear with the black body's temperature after fitting a curve to the experiment data points. Then the relationship of the response and the gain was studied when the black body's temperature kept constant. The preliminary analysis of calibration data shows that the response of the thermal imager is linear and the average grey value of the image is directly proportion to the gain. According to the experimental results the reference gains and the dynamic range of temperature measurement were obtained. Finally the uncertainty influencing the calibration results was analyzed the analysis shows the maximal uncertainty is 5.2% which can meet the calibration requirement less than 10%. 2010 Copyright SPIE - The International Society for Optical Engineering.
	Development and radiance calibration of three-waveband camera (EI CONFERENCE) 会议论文 OAI收割 International Symposium on Photonics and Optoelectronics, SOPO 2010, June 19, 2010 - June 21, 2010, Chengdu, China 作者: Wang J.; Liu Y.; Liu Y.; Sun Q.; Liu Y. 收藏 \| 浏览/下载：30/0 \| 提交时间：2013/03/25 An imaging system with three-waveband sharing one lens and an area CCD was developed. By rotating different filters into the beam path the required waveband was selected. The optical system which can image in ultraviolet visible and near infrared region was designed and the signal collecting system was integrated. The optical design and system integration have some advantages such as low cost small size and light in weight. To obtain a high imaging quality the radiation calibration is carried out in order to establish the relation between the average grey level of output image and the input radiance from the integrating sphere. According to the calibration data in experiments the radiation dynamic range and the best working point of the system are determined. The experiment result shows that the dynamic range of the image system is maximal when the exposure time is 8ms in ultraviolet 0.5ms in visible and 0.125ms in near infrared region. 2010 IEEE.
	Level 0 and level 1 data processing for a type of hyper-spectral imager (EI CONFERENCE) 会议论文 OAI收割 2009 International Conference on Optical Instruments and Technology, OIT 2009, October 19, 2009 - October 21, 2009, Shanghai, China Li X.; Yan C. 收藏 \| 浏览/下载：74/0 \| 提交时间：2013/03/25 Hyper-spectral imaging (HSI) is a kind of optical remote sensor that can simultaneously obtain spatial and spectral information of ground targets. We are now designing a data processing system for a type of space-borne push-broom HSI then it performs radiometric and spectral calibration based on the ground calibration results and onboard calibration collection. The detailed algorithms for bad pixel replacement which has 128 spectral channels covering the spectral range from 400nm to 2500nm. With its large amount of spectral channels radiometric and spectral calibration were presented. After processing the HSI collects large volume of spectral imaging data need to be efficiently and accurately processed and calibrated. In this paper the digital numbers downlinked from the spacecraft can be converted into at-sensor absolute spectral radiance of ground targets the detailed Level 0 and Level 1 data processing steps for the HSI were presented. The Level 0 processing refers to a set of tasks performed on the data downlinked from the spacecraft thus providing accurate quantified spectral imaging data for various applications. 2009 SPIE. including decoding to extract science data separating the science data into files corresponding to different tasks (e.g. ground imaging dark imaging and onboard calibration) checking data integrity and instrument settings data format conversion and Level 0 files creation. The Level 1 processing performs several steps on Level 0 data. Firstly it corrects the image artifacts (mostly the SWIR smear effect) subtracts the dark background and performs the bad pixel replacement according to the prelaunch measurement
	A theoretical study on the effect of ozone below cloud on total ozone retrieved by toms and a new inversion algorithm 期刊论文 iSwitch采集 Chinese journal of geophysics-chinese edition, 2007, 卷号: 50, 期号: 2, 页码: 364-369 作者: Jiang Fang; Wang Ying-Jian; Liu Zhen-Xing; Wang Yong-Mei; Zhang Xiao-Qing 收藏 \| 浏览/下载：18/0 \| 提交时间：2019/05/10 Total ozone amount Backscattered ultraviolet radiance Effective reflectivity of cloud top Cloud effective radius Cloud optical thickness
	Research on the nonuniformity correction of linear TDI CCD remote camera (EI CONFERENCE) 会议论文 OAI收割 Advanced Materials and Devices for Sensing and Imaging II, November 8, 2004 - November 10, 2004, Beijing, China Ya-xia L.; Zhi-hang H. 收藏 \| 浏览/下载：24/0 \| 提交时间：2013/03/25 Many applications such as industrial inspection and overhead reconnaissance benefit from line scanning architectures where time delay integration (TDI) significantly improves sensitivity[5]. Images with linear response have become the backbone of the imaging industry. But each pixel of the TDI CCD has unique light sensitivity characteristics. Because these characteristics and the lens of the optical system affect camera's linearization and its performance they must be removed through calibration. The process by which a CCD image is calibrated is known as nonuniformity correction. This paper discusses several methods of nonuniformity correction[2]. The first is one-point correction technique which requires only one calibration point. This approach is to shift each curve toward the nominal curve by subtracting the offset from or adding the offset to the average. The second is two-point correction technique which requires two calibration points. Each point is rotated and aligned so that all the detectors have the same response under the same radiance. The third is multipoint correction. It is recommended that more calibration points be implemented at appropriate regions of the response curve. Depend on the linear photoelectric response of the TDI CCD we use two-point calibration and the standard deviations for the images are given before and after the correction.
	Lightning activity on the central Tibetan Plateau and its response to convective available potential energy 期刊论文 iSwitch采集 CHINESE SCIENCE BULLETIN, 2003, 卷号: 48, 期号: 3, 页码: 296-299 作者: Qie, XS; Toumi, R; Zhou, YJ 收藏 \| 浏览/下载：29/0 \| 提交时间：2019/10/08 Tibetan Plateau lightning activity optical radiance convective available potential energy