遥感图象在评价天柱金矿带中的意义

天柱金矿带至今已发现脉金、砂金矿(化)点数十处。矿带位于雪峰弧形构造西南段.地层为一套呈北东向展布的震旦纪浅变质岩系。全区为一复式构造,呈北东—南西向展布,次一级背斜、向斜发育,断裂构造更为发育.矿带遥感图象具丰富的地质构造信息,尤以线性构造更为丰富,经地质解译,矿带内的断裂构造规模增大、数量增多,提示了金矿与构造,特别是与断裂构造的关系,给金矿带的综合评价提供了新的依据.矿带受北东向构造,矿床则受北西向、北西西或东西向断裂构造控制,并与环形构造也有一定的关系.地质信息,无疑给天柱金矿带的综合评价及远景区的预测提供了新的依据.     

中国彩色卫星影像图的设计与编制

从我国国情和应用需要出发,选用70年代陆地卫星MSS影像584景,采用合理的制图设计与多种光学处理及软镶嵌制图技术,编制成1:100万中国假彩色卫星影像图。该影像图色彩协调一致,宏观效果良好,它生动形象地反映我国自然地理概貌,具有广泛的应用和学术价值。     

用近场余震观测资料研究张北地震的发震构造

本文对张北近场地震资料进行了重新定位,并通过网格化处理得到震源空间分布图像、发震时间图像和定位残差图像.震源空间分布图像和发震时间图像细致地显示了极震区周围的发震构造时空特征为明显的北西方向,另外还存在断续的北东向特征.该震区在中新生代以来有过多期岩浆活动,极震区米家沟附近有一个火山口并且地壳内存在低速带和深断裂,复杂的地壳构造为孕震提供了必要的深部环境.     

Fracture characteristics and stress directions in the quaternary sediments of the Ulleung Basin,East Sea: Based on resistivity image log data

Abstract

Geophysical evidence indicating the presence of gas hydrate has been found in the Ulleung Basin, which lies off the east coast of the Korean Peninsula; however, hydrate distribution in the basin is not well understood. Logging-while-drilling data for 13 sites in the Ulleung Basin, East Sea, were obtained to investigate the distribution pattern of gas hydrate. Most of the sites yielded log data indicating the presence of gas hydrate. Prominent fractures (both resistive and conductive fractures) were clearly identified on the resistivity borehole images, particularly at seismic chimney sites. Resistive fractures, which contain large amounts of gas hydrate, are prominent in the seismic chimney sites. The strike and dip of each fracture was calculated and displayed on a stereographic plot and rosette diagram. From the fracture orientations on the stereographic plots, the maximum horizontal stress is NW–SE, reflecting the regional stress regime around the Ulleung Basin, although the fracture orientations are broadly distributed, indicating that the fracture pattern is not well-ordered on the rosette diagram. The fracture dips are between 36.46° and 63.66°; the range of dip azimuths is 0.94°–359°, and exhibit little change with depth. The dip azimuths are generally westerly to southwesterly.     

图像处理技术在堆积体块石含量统计中的应用

本文选取湖南衡阳南岳区拜殿乡发育的堆积体斜坡作为研究对象,通过分析堆积体结构特征的特殊性,提出了使用图像分析技术与现场筛分实验相结合来获得堆积体中块石含量的统计方法,即通过图像采集、图像处理、图像分析、数据处理等一系列必要的操作来获取块石含量数据,再与现场筛分实验数据结合统计含石量。结果表明,图像处理技术原理可靠,操作简便,检测速度快,图像处理与现场实验相结合的方法较传统的土工试验结果更加精确,该方法可以在堆积体滑坡的工作中广泛使用。     

利用等高线数据制作大规模3D遥感影像

把图像数据库的建库思想引入到大规模3D遥感影像的制作中。在此基础上，提出利用合并分割法制作大规模3D遥感影像。将经 过特殊处理的等高线数据制成小块DEM，采用两种模式将遥感影像与这些DEM进行纹理映射，从而制作成大规模3D遥感影像。这种方法提 高了大规模3D遥感影像的制作水平，进一步增强了大规模3D遥感影像的信息量与实用性。     

四种IHS变换用于SAR与TM影像复合的比较

本文采用四种典型的ＩＨＳ变换对同一地区的ＳＡＲ与ＴＭ影像进行了复合,并对复合影像作了定性和定量的分析。试验结果表明：用熵、联合熵和平均棍度这３个客观定量指标评价复合效果不仅比目视评价准确有效,而且提供了选择最佳ＩＨＳ变换用于复合的方法。     

一种地震预测研究数据库及其震例图像演示系统

以地震预测人员的工作成果为基础，建立预测震例资料的数据库，并以经典Office的PowerPoint幻灯程序为数据库载体，以地震空间分布为演示系统的主页，给出多种选择的震例资料图像和前兆资料演示系统。该系统具有空间定位演示的特点，因此可给出震例直观的空间特征。此外，使用还可以依据自己的研究成果和资料方便地扩展资料库。本系统可为强震发生后的震情趋势判定和决策提供快速的、明确的基础数据和可对比借鉴的震例，也可作为地震预测基础研究丰富翔实的资料库。     

珊瑚的影像密度恢复南海海表温度

将南海西沙永兴岛 ( 1 6°50′N,1 1 2°2 0′E)西北的造礁珊瑚的岩芯 ,制成 X射线负片。用显微光密度计在 X射线负片上获得沿生长轴方向的影像密度值 ,时间序列为 1 937～ 1 993年。根据影像密度数据 ,计算出珊瑚的各年生长率和钙化率的代用指标。珊瑚生长率和钙化率的代用指标都与 SST呈显著正相关。根据 1 960～ 1 993年的资料统计 ,相关系数分别是 0 .91和 0 .85,从而建立了珊瑚生长率温度计和钙化率代用指标温度计。并用这两个温度计测算到 1 937年 ,揭示出南海的 SST变化既受到全球气候环境变化为主的影响 ,也受到半封闭海域格局的影响     

Quantitative evaluation of variations in rule-based classifications of land cover in urban neighbourhoods using WorldView-2 imagery

The increasing availability of high resolution imagery has triggered the need for automated image analysis techniques, with reduced human intervention and reproducible analysis procedures. The knowledge gained in the past might be of use to achieving this goal, if systematically organized into libraries which would guide the image analysis procedure. In this study we aimed at evaluating the variability of digital classifications carried out by three experts who were all assigned the same interpretation task. Besides the three classifications performed by independent operators, we developed an additional rule-based classification that relied on the image classifications best practices found in the literature, and used it as a surrogate for libraries of object characteristics. The results showed statistically significant differences among all operators who classified the same reference imagery. The classifications carried out by the experts achieved satisfactory results when transferred to another area for extracting the same classes of interest, without modification of the developed rules.