加入多时相纹理的遥感变化检测     

李淑坤  李培军  程涛 《国土资源遥感》2009,(3):35-40

基于遥感技术的变化检测是遥感应用的一个重要方面.传统基于遥感的变化检测方法一般是利用光谱信息,较少注意多时相图像间的光谱特征相关关系分析.本文运用地统计学的伪交叉变差函数(Pseudo Cross Variogram)计算多时相图像纹理,定量表达多时相图像间的空间相关关系,并将得到的多时相纹理信息与光谱信息一起用于多时相变化检测.实验结果表明,加入多时相纹理信息可以显著提高变化检测精度,是一种有效的方法.  相似文献   

同时检测监测网的异常形变和粗差   总被引：5，自引：3，他引：2  

柴艳菊  欧吉坤 《大地测量与地球动力学》2003,23(1):64-68

粗差干扰影响形变分析成果的质量，以往都是粗差与异常变形分开来检测，即对每一期观测锡除粗差后再进行平差，然后利用两期或多期平差结果进行形变分析，这两步是重复的，为此，从位移观测方程入手，根据粗差检测与异常形变检测相似的特点，提出将粗差与异常形变同时检测，根据二者的不同特点，将它们区分开的新思路。通过算例分析比较了拟准检定法、假设检验法及相关抗差估计方案的检测效果，结果表明拟准检定法具有比其它两种方法实施简单、定位准确的优点，同时验证了这种思路的可行性。  相似文献   

地球各圈层相互作用的大地测量研究和检测   总被引：3，自引：0，他引：3  

许厚泽 《大地测量与地球动力学》2002,22(4):1-5

大地测量资料，包括在球表面运动，地球引力场及地球整体自转运动的观测资料，是研究地球各圈层相互作用的重要地表约束，探讨了大地测量用于这一研究领域中的几个重要科学前沿问题。  相似文献   

CHAMP卫星快速科学轨道数据的使用及精度评定   总被引：6，自引：5，他引：1  

徐天河  杨元喜 《大地测量与地球动力学》2004,24(1):81-84

指出了德国GFZ数据中心提供的CHAMP卫星快速科学轨道数据存在的两个问题，即：1)轨道数据文件开始、结束段精度较低；2)轨道数据中存在粗差。针对这些问题，给出了CHAMP卫星快速科学轨道数据的拼接及粗差探测方法。利用德国慕尼黑技术大学提供的精密约化动力法轨道对CHAMP卫星快速轨道数据的精度进行了评估。结果表明：CHAMP卫星快速科学轨道的位置精度在10～20cm左右，速度精度为0．3～0．5mm／s。  相似文献   

泉州市地下管线探测经验探讨   总被引：1，自引：0，他引：1  

陈南阳 《测绘与空间地理信息》2006,29(5):121-122

系统介绍泉州市地下管线探测成功经验,为我国低纬度地区城市地下管线探测提供参考。  相似文献   

Search for supernova neutrino bursts with the AMANDA detector     

《Astroparticle Physics》2002,16(4):119-359

The core collapse of a massive star in the Milky Way will produce a neutrino burst, intense enough to be detected by existing underground detectors. The AMANDA neutrino telescope located deep in the South Pole ice can detect MeV neutrinos by a collective rate increase in all photo-multipliers on top of dark noise. The main source of light comes from positrons produced in the CC reaction of anti-electron neutrinos on free protons . This paper describes the first supernova search performed on the full sets of data taken during 1997 and 1998 (215 days of live time) with 302 of the detector's optical modules. No candidate events resulted from this search. The performance of the detector is calculated, yielding a 70% coverage of the galaxy with one background fake per year with 90% efficiency for the detector configuration under study. An upper limit at the 90% c.l. on the rate of stellar collapses in the Milky Way is derived, yielding 4.3 events per year. A trigger algorithm is presented and its performance estimated. Possible improvements of the detector hardware are reviewed.  相似文献   

Oil spill detection with fully polarimetric UAVSAR data   总被引：3，自引：0，他引：3  

Liu P  Li X  Qu JJ  Wang W  Zhao C  Pichel W 《Marine pollution bulletin》2011,62(12):2611-2618

In this study, two ocean oil spill detection approaches based on four scattering matrices measured by fully polarimetric synthetic aperture radar (SAR) are presented and compared. The first algorithm is based on the co-polar correlation coefficient, ρ, and the scattering matrix decomposition parameters, Cloud entropy (H), mean scattering angle (α) and anisotropy (A). While each of these parameters has oil spill signature in it, we find that combining these parameters into a new parameter, F, is a more effective way for oil slick detection. The second algorithm uses the total power of four polarimetric channels image (SPAN) to find the optimal representation of the oil spill signature. Otsu image segmentation method can then be applied to the F and SPAN images to extract the oil slick features. Using the L-band fully polarimetric Uninhabited Aerial Vehicle – synthetic aperture radar (UAVSAR) data acquired during the 2010 Deepwater Horizon oil spill disaster event in the Gulf of Mexico, we are able to successfully extract the oil slick information in the contaminated ocean area. Our result shows that both algorithms perform well in identifying oil slicks in this case.  相似文献   

The effectiveness of double hulls in reducing vessel-accident oil spillage     

Yip TL  Talley WK  Jin D 《Marine pollution bulletin》2011,62(11):2427-2432

While much work has been done in investigating determinants of oil spillage attributed to vessel accidents, little research has been conducted on the effectiveness of ship hull design in reducing marine pollution. This paper addresses whether the double-hull requirement reduces vessel-accident oil spillage. The volume of oil spillage due to oil-cargo vessel accidents was investigated using tobit regressions and an empirical data set of individual vessel accident pollution incidents investigated by the US Coast Guard from 2001 to 2008. The results indicate that the double hull design on average reduces the size of oil spills by 20% and 62% in tank barge and tanker ship accidents, respectively.  相似文献   

关于在无线传感器网络中测量数据出错识别和纠正的算法     

陈建  罗惠琼 《成都信息工程学院学报》2004,19(4):532-534

在无线传感器网络环境中,针对一个具体的模拟任务来探讨传感器节点测量数据(二进制数据)错误出错识别和纠正问题,并给出一种可行性算法(阀值推论)来检测和纠正此类错误.理论分析和仿真显示,在少量传感器节点(＜15%)出错情况下,系统能够检测和纠正其中的80%～90%错误.  相似文献   

航空重力GPS测速多粗差探测方法     

郑凯  刘站科  肖学年  张小红 《测绘学报》2016,45(6):663-669

GPS速度测量在航空重力测量中具有重要的作用。根据飞机平稳飞行的状态,建立了严密的状态方程,利用常加速度模型的速度预测值,构建了观测值验前残差检验量Q,并给出其误差源:观测误差与速度预测误差,根据检验量Q的统计特性结合IGGⅢ抗差方案,对含粗差的观测值作降权处理。采用静态数据分析观测误差的统计特性,并给出其模型参数,同时分析了理想运动状态下的速度预测精度以及数据采样率与新方法粗差探测能力之间的关系。通过静态和动态算例表明,新方法能有效探测出小于1周的粗差。  相似文献