基于模板匹配的航片框标定位法          下载免费PDF全文

胡志定  王慧  张强 《海洋测绘》2009,29(4):42-45

针对数字化航空影像提出了一种新的基于影像匹配的框标定位方法。先通过内边缘检测搜索框标所在的匹配窗口,然后采用模板匹配的方式确定框标的概略位置,再依据所有的框标概略位置整体确定模板图像的旋转参数,进而对各框标进行精确的匹配定位。为简化算法,还提出了一种基于数学形态学的框标模板构建方法。实验证明,本算法自动化程度高、稳定、快速。  相似文献   

Clastic injectites,internal structures and flow regime during injection: The Sea Lion Injectite System,North Falkland Basin     

Thomas J. H. Dodd  Dave J. McCarthy  Stuart M. Clarke 《Sedimentology》2020,67(2):1014-1044

This paper details and describes a suite of 143 sub-seismic-scale clastic injectites encountered within the early Cretaceous, early post-rift of the deep-lacustrine North Falkland Basin. The injectites, referred to here as the Sea Lion Injectite System, are encountered below, above and in between the hydrocarbon-bearing, deep-lacustrine turbidite sandstones of the Bleaker 30, Sea Lion North, Sea Lion, Casper and Beverley fans. Sedimentary structures are documented within the injectites including: planar laminations, mud-clast imbrication and clast alignment. Clasts align along centimetre-scale foresets formed through ripple-scale bedform migration in a hydraulically-open fracture. The style of flow within the injectite system is interpreted as initially through fluid turbulence during an open fracture phase, which was followed by a later stage where laminar flow dominated, most likely during the closing phase of the fracture system. The host rocks display evidence for ductile deformation, which along with ptygmatic folding of dykes and internally injected mud-clasts, suggests a period of injection into relatively uncompacted sediments. Evidence for brittle fracturing, in the form of stepped margins may be indicative of a separate phase of emplacement into more-compacted sediments. This variability in deformation styles is related to multi-phased injection episodes into host strata at different stages of consolidation and lithification at shallow burial depths. Injectites have been identified in four stratigraphic groupings: above the Bleaker 30 Fan and within/above the Sea Lion North Fan; within the hydrocarbon-bearing Sea Lion Fan; overlying the Sea Lion Fan; and above/below the hydrocarbon-bearing Casper and Beverley fans. This spatial association with the hydrocarbon-bearing fans of the North Falkland Basin is important, considering the ability of injectite networks to form effective fluid-flow conduits in the subsurface. Consequently, the findings of this study will improve the characterization of sub-seismic scale injectites (and therefore fluid conduits) within otherwise impermeable strata.  相似文献   

A note on sand ripples developing in sandstone rock seepages of the Weald,UK     

Allan Pentecost 《地球表面变化过程与地形》1999,24(13):1257-1259

Ephemeral sand ripples are described from steep rock surfaces in the UK. They are unconsolidated or stabilized by algae and bryophytes. The sand is transported by flowing water to produce a semi-regular pattern of sinuous ripples averaging 6–8 mm apart and with a relief not exceeding 4 mm. The ripples may be initiated by the formation of a self-perpetuating capillary wave template. Sand grains accumulate on the template to form the fully developed ripples. Ultimately, gravitational forces or flooding lead to their destruction. Travertine rimstones may be initiated in the same manner. Copyright © 1999 John Wiley & Sons, Ltd.  相似文献   

大兴安岭南段巴彦高勒银多金属矿地质地球化学特征及找矿标志          下载免费PDF全文

朵兴芳  屠立鹏  李志丹  王丽瑛  魏子鑫  王俊  高洪生 《地质找矿论丛》2020,35(4):390-398

巴彦高勒银多金属矿是大兴安岭南段新发现的一例小型银多金属矿床,矿体多呈脉状、透镜状产于古元古界锡林郭勒杂岩中,受NE向断裂控制。矿石矿物主要有方铅矿、闪锌矿、黄铁矿、辉银矿、黝锑银矿等,脉石矿物主要有萤石、毒砂、石英、绿帘石、绿泥石等。围岩蚀变主要为褐铁矿化、硅化、高岭土化、黄铁矿化、绿泥石化、绿帘石化等。通过在该矿区开展1∶1万土壤地球化学测量,共圈定出编号为Ht-1至Ht-4的4个矿致组合异常区,并发现了对应的矿脉和蚀变带。根据矿体发育部位和围岩蚀变分带特征,推测成矿与热液活动有关,矿床成因为中低温热液型。通过分析成矿地质特征,得出该矿床浅表以褐铁矿化,深部以硅化、高岭土化为重要的找矿标志,北东向构造破碎带是重要的控矿构造,而1∶1万土壤地球化学测量成果圈出的Ag、Pb、Zn单元素地球化学异常及Ag-Sb-Sn-Cu-Pb-Zn组合异常是十分有效的化探标志。  相似文献   

蒙古东部道尔脑德矿集区成矿作用及找矿标志          下载免费PDF全文

赵泽霖  李俊建  张鹏鹏 《地质找矿论丛》2021,36(3):355-365

蒙古国东部省道尔脑德地区于侏罗纪—早白垩世火山活动频繁,形成道尔脑德火山机构,发育基性-酸性双峰式火山熔岩及火山碎屑岩,夹有陆源碎屑岩.同期该区域由挤压到伸展的构造体制转变,构造-岩浆热作用强烈,发生大规模成矿作用,形成与火山热液有关的铀-贱金属-金-萤石矿床成矿系列.文章在分析不同矿床成因类型、成矿时代及成矿温度基础...  相似文献   

喀喇昆仑黑山头铜多金属矿地质特征与找矿标志          下载免费PDF全文

梁东  华北  唐魏子  万生楠  梁孝伟  杨志鹏 《地质找矿论丛》2022,37(2):156-163

黑山头铜多金属矿是喀喇昆仑阿克赛钦地区新发现的小型铜多金属矿床。矿床初步地质勘查表明,铜多金属矿体主要赋存于长城系甜水海岩群和志留系温泉沟组粉砂岩中,受NW向断裂控制,共圈定矿体4条,其中Ⅱ-1和Ⅲ-1号等主矿体长100~650 m,厚1.29~4.07 m,呈脉状、透镜体状、似层状,成矿元素为Cu、Au、Pb、Zn、Ag,总体上矿石品位不高,矿化不均匀。矿石矿物主要为孔雀石、铜蓝、黄铜矿、方铅矿、闪锌矿,脉石矿物主要有绢云母,石英、方解石和泥质等。围岩蚀变主要为绢云母化、碳酸盐化、褐铁矿化。根据矿体赋存特征和围岩蚀变特点,推测成矿与热液活动有关,矿床成因为构造热液型。通过矿床地质特征归纳出矿区地球化学、地球物理、地层岩性矿物组合、构造、围岩蚀变等找矿标志,为下一步勘查评价和区域找矿提供参考。  相似文献