利用数码相机进行房产测量初探   总被引：1，自引：0，他引：1  

刘亚文 《地理空间信息》2004,2(6):31-33

现有房产基础图获取方法存在精度不高,设备比较昂贵,观测时易受大树、高大建筑物遮挡和干扰等不足。文章采用少量地面控制信息和数码相机获取的房屋序列影像,充分利用房屋上丰富的点、直线信息来进行半自动房屋角点坐标的量测。  相似文献   

矿山条带开采相似材料模型变形测量   总被引：2，自引：0，他引：2  

杨化超  邓喀中  杨国东  牛雪峰  董四辈 《吉林大学学报(地球科学版)》2007,37(1):190-194

针对传统模型观测方法中存在的观测装置或传感器安装麻烦、工作量大、采样点有限等缺点,引入计算机视觉和数字近景摄影测量技术量测模型变形。用高分辨率数字相机获取不同模型,模拟开挖状态下的多组数字影像,选取二值化阈值对图像进行分割,根据标记区域的形状参数自动检测和识别标志点,通过边缘跟踪和椭圆拟合算法确定标志点中心坐标;推导了用二维直接线性变换关系式和共线方程分解出影像外方位元素初值的实用算法,利用光束法平差对标志点空间坐标进行精确定位。试验结果表明,空间坐标的测定精度高于±1mm,所测位移场与实际变形情况较为一致,可以满足矿山岩层和地表移动相似材料模型观测要求。  相似文献   

Fumarole monitoring with a handheld infrared camera: Volcán de Colima,Mexico, 2006–2007     

John A. Stevenson  Nick Varley 《Journal of Volcanology and Geothermal Research》2008

This paper describes a methodology for the monitoring of fumarole temperatures at medium ranges (~ 6 km) using a handheld infrared camera (wavelength range: 8–13.5 µm). As a relationship between fumarole temperatures, gas flux and volcanic activity has been demonstrated by a number of studies, fumarole temperature data has a potential use as a monitoring tool. Volcán de Colima is an andesitic stratovolcano with a 300 m diameter summit crater formed by the destruction of the 2004 lava dome by a series of explosions in 2005. Between January 2006 and August 2007, sequences of thermal images were recorded from a viewpoint 6 km to the north during regular 24–48 hour monitoring excursions. The temperatures of fumaroles on the crater rim and the ground surface on the volcano's flanks were measured. A methodology was developed to remove data affected by clouds or volcanic water vapour based on rates of temperature change and scatter within the data. For the remaining data, it is demonstrated mathematically that at this range, typical variations in atmospheric transmissivity will affect the apparent temperatures by +/− 2 °C, while a 25% change in fumarole heat flux would change it by 5–10 °C. The mean night-time apparent temperature of the fumaroles was calculated for each excursion and showed an irregular decline over the 19 month period. Subtracting the radiant heat flux of flank rocks from those of the fumaroles removes seasonal variations and gives the clearest view of trends in the fumarole heat flux. A sharp drop in fumarole temperature during February 2007 coincided with the emergence of a lava dome in the crater. The declining fumarole temperature is interpreted to reflect decreasing gas flux from the crater in line with a change in eruptive regime from frequent, small, ash-rich explosions to slow effusion of lava.  相似文献   

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杨立君  马明栋  苗立志 《大地测量与地球动力学》2012,32(4):135-138

???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????о??????????????????????????????????????????????????????????????????????????????????????????????????????????????????  相似文献   

顶板诱导崩落爆破效果的全景探测与评价     

胡建华  周科平  罗先伟  邓红卫 《岩土力学》2010,31(5):1529-1533

基于连续采矿的顶板诱导崩落技术,采用预裂爆破控制裂隙发展区间,强制崩顶爆破诱导顶板围岩裂隙发育、扩展,从而诱导顶板致裂失稳的可控崩落。然而在地下采空区顶板诱导致裂失稳崩落处理采空区过程中,预裂与崩顶爆破效果具有极大的隐蔽性,难以进行直观可视的评价。采用钻孔摄像系统,利用前视与全景可视技术,对顶板诱导爆破前钻孔形态和爆破的效果进行了探测,特别在爆破后的全景钻孔摄像,数字化描述了钻孔的裂隙特征,并通过钻孔摄像的图片分析评价了顶板诱导崩落爆破效果。全景探测的结果表明：（1）预裂爆破在顶板岩体中形成了清晰可见宽为20～40 mm的预裂缝,炮孔底部存在半个孔壁的预裂特征。（2）顶板围岩中产生了大量的次生诱导微裂隙带,裂隙交错呈“X”型,并且原生裂隙得到了扩展。（3）顶板诱导爆破实施后爆堆形状良好,大量裂隙发育以及碎裂岩体结构的形成有利于顶板的诱导可控崩落。  相似文献   

基于钻孔摄像技术的岩体完整性评价方法   总被引：1，自引：0，他引：1  

王川婴  胡培良  孙卫春 《岩土力学》2010,31(4):1326-1330

通过钻孔摄像技术获取岩体的结构特性,提出一种评价岩体完整性的新方法--RMDI法,并应用于开滦煤矿唐山矿区数字钻孔摄像工程地质勘测中的离层孔。结果表明：（1）高精度的钻孔图像能为岩体完整性评价提供可靠的结果;（2）DIDF能反映钻孔壁岩体完整程度的轴向分布状况;（3）RMDI法用于评价岩体完整性是可行的;（4）RMDI法能实现全孔段或局部孔段的岩体完整性评价,完成对岩体不同完整段的位置搜索。  相似文献   

Assessment and Management Strategies for Ungulate Population in Jiangxi Matoushan National Nature Reserve: Predicting the Prey-base from Empirical Field Data     

PAN Guoliang  LAGUARDIA Alice  HUETTMANN Falk  SHI Kun 《资源与生态学报(英文版)》2016,7(5):397-406

In order to investigate the feasibility of reintroducing the South China tiger (Panthera tigris amoyensis) in the Jiangxi Matoushan National Nature Reserve, field surveys were conducted to assess prey distribution in the reserve. Twelve permanent transects were set in three distinct functional zones from February to April 2012 and May to July 2013. A total of 112 ungulate signs were recorded on these transects. In addition, 20 camera traps were used to survey ungulates and predators in 2012, while the following year we extended the survey site by using 30 cameras. Overall, 6641 capture events on 2930 camera days were obtained, presenting a variety of ungulate species: muntjak (Muntiacus muntjak), tufted deer (Elaphodus cephalophus), serow (Capricornis sumatraensis) and wild boar (Sus scrofa). Population structure and composition of ungulates was compared in different functional zones using a single factor of variance analysis in SPSS software. Significant differences in the distribution of ungulates were recognized between the core zone and experimental zone, but not in other zones due to differences in habitat types and management practices of the nature reserve. Using ArcGIS analysis and Salford Predictive Modeler software, we ran several predictive models to understand which areas are most suitable for ungulates. We conclude that muntjac and wild boar are mainly distributed in the experimental zone, serow are more common in the core zone, while tufted deer are located evenly in the three functional zones. Finally, suggestions for effective and feasible management strategies and techniques for Matoushan National Nature Reserve were recommended based on the results and analysis in this study.  相似文献   

微型无人机遥感影像的纠偏与定位   总被引：13，自引：0，他引：13  

马瑞升 孙涵林宗桂  马轮基吴朝晖 黄耀 《南京气象学院学报》2005,28(5):632-639

在分析无人机遥感影像几何变形理论基础上，利用标准图形垂直摄影法标定相机，建立相机误差纠正模型；使用大比例尺地形图作为底图，通过同名点配准纠正航摄影像，全过程不使用外方位元素。最终影像经实际检验，单点定位平均误差为1．0m左右。  相似文献   

偏流角对星载三线阵相机摄影的影响   总被引：1，自引：0，他引：1  

胡燕  胡莘  王新义  赵斐 《测绘科学》2006,31(4):62-63

本文通过介绍偏流角的产生原因以及星载三线阵CCD相机的成像特点,结合具体算例分析了偏流角以及剩余偏流角对星载三线阵相机摄影的影响,提出为了保证三线阵影像的有效立体重叠,必须对偏流角进行修正。  相似文献   

双目序列影像3维运动物体定位跟踪     

张春森 《测绘学报》2006,35(4):347-352

将计算机视觉中立体和运动视觉相结合,通过数字摄影测量方法,对智能视觉监控中计算机系统所获得的双序列图像通过物方“图像”分析法完成对运动物体空间位置的定位、量测及其跟踪,其中包括:摄像机检校,立体-运动双匹配约束,运动参数的求解及其云台运动控制等内容。给出采用所述方法,从真实双目序列影像中获取物体以匀速直线运动和匀加速直线运动云台运动控制的实验结果。  相似文献