纹理特征与视觉注意相结合的建筑区提取   总被引：3，自引：1，他引：2  

沈小乐  邵振峰  田英洁 《测绘学报》2014,(8)

提出一种有效提取高分辨率遥感影像建筑区的算法。通过模拟人类视觉系统感知环境的过程,引入视觉注意机制,提出基于自信息最大化视觉注意机制的建筑区显著指数。根据建筑区在高分辨率遥感影像中的特点,基于时/频域的纹理分析,提出一种针对建筑区的纹理特征描述方法,实现了建筑区的高效提取。通过对8组高分辨率遥感影像进行试验,验证了本文算法的有效性。  相似文献   

湖北省乡镇温度预报方法初探   总被引：11，自引：2，他引：9  

黄治勇  张文  陈璇  孟英杰  王继竹 《气象》2011,37(12):1578-1583

为了提高精细站点温度预报水平,本文在中尺度模式精细化温度预报的基础上,结合MOS分县客观预报结果,采用带海拔高度的距离权重温度插值方法,经过灰色预测模型修正温度预报误差,对湖北省717个四要素自动观测站的72小时内日高低温度进行了精细化预报,并且利用乡镇自动站温度观测进行了检验。结果显示：对于没有历史观测资料的站点,采用此预报方法,预报效果明显高于模式预报结果,基本接近客观预报方法,可以进行业务应用。对湖北的四要素自动观测站温度检验的结果还表明：鄂西北的预报误差最大,江汉平原的预报效果最好;从分月预报情况来看,高低温度都是夏季和初秋预报效果最好,低温预报冬春季预报效果最差,湖北各个区域趋势基本都一致,而高温的预报却没有一致的趋势。  相似文献   

Application of rough set-based analysis to extract spatial relationship indicator rules: An example of land use in Pearl River Delta     

GE Yong  CAO Feng  DU Yunyan  LAKHAN V. Chris  WANG Yingjie  LI Deyu 《地理学报》2011,21(1):101-117

Spatial relations, reflecting the complex association between geographical phenomena and environments, are very important in the solution of geographical issues. Different spatial relations can be expressed by indicators which are useful for the analysis of geographical issues. Urbanization, an important geographical issue, is considered in this paper. The spatial relationship indicators concerning urbanization are expressed with a decision table. Thereafter, the spatial relationship indicator rules are extracted based on the application of rough set theory. The extraction process of spatial relationship indicator rules is illustrated with data from the urban and rural areas of Shenzhen and Hong Kong, located in the Pearl River Delta. Land use vector data of 1995 and 2000 are used. The extracted spatial relationship indicator rules of 1995 are used to identify the urban and rural areas in Zhongshan, Zhuhai and Macao. The identification accuracy is approximately 96.3%. Similar procedures are used to extract the spatial relationship indicator rules of 2000 for the urban and rural areas in Zhongshan, Zhuhai and Macao. An identification accuracy of about 83.6% is obtained.  相似文献   

中国农村地区住房结构的区域差异及其影响因素   总被引：1，自引：0，他引：1  

李方一  高晓路  王英杰 《地理科学进展》2011,30(12):1555-1563

农村住房结构是决定地震灾害脆弱性的重要因素。对全国农村住房结构的差异性及其影响因素进行分析,是科学评估农村房屋脆弱性的基础。首先,根据2000年全国第五次人口普查（五普）结果,将农村房屋分为“钢混”、“砖混”和“传统结构”（包括五普中住房墙体材料的“木、草、竹”和“其他”2个类型）3种结构类型,建立了全国县级尺度农村住房数据库,共2699个区县。探讨农村住房结构的空间差异,遴选可能与之相关的因素进行相关分析,然后通过主成分分析和因子分析归纳出影响各类房屋空间分布的主要因素。结果表明,砖混结构是全国大部分农村地区最主要的住房结构类型,尤其在中东部地区的比例很高,而传统结构住房在西部地区所占比例较高（接近50％）,影响这两种结构住房空间分布的主要因素是气候、地域文化和农村经济发展水平,农民收入水平越高,砖混结构房屋比例越高。钢混结构在农村房屋中所占比例普遍很低,东中部地区比西部、东北略高,气候、非农就业和镇域经济发展水平是影响其空间分布的主要因素。为了降低农村地区地震脆弱性,建议中国农村政策应以提高农民收入水平为主,并积极推动农村人口向小城镇聚集,还需要在农村地区逐步推广房屋抗震规范。  相似文献   

Study on the Combined Application of CFAR and Deep Learning in Ship Detection     

Ruifu Wang  Jie Li  Yaping Duan  Hongjun Cao  Yingjie Zhao 《Journal of the Indian Society of Remote Sensing》2018,46(9):1413-1421

To maintain national socio-economic development and maritime rights and interests, it is necessary to obtain the space location information of various ships. Therefore, it is important to detect the locations of ships accurately and rapidly. At present, ship detection is mainly carried out by combining satellite remote sensing imaging with constant false alarm rate (CFAR) detection. However, with the rapid development of satellite remote sensing technology, remote sensing data have gradually begun to show the characteristics of “big data”; additionally, the accuracy and speed of ship detection can be improved by analysing big data, such as by deep learning. Thus, a ship detection algorithm that combines CFAR and CNN is proposed based on the CFAR global detection algorithm and image recognition with the CNN model. Compared with the multi-level CFAR algorithm that is based on multithreading, the algorithm in this paper is more suitable for application to ship detection systems.  相似文献   

内蒙古乌兰沟埃达克岩锆石U-Pb年龄及构造环境   总被引：2，自引：1，他引：1  

王金芳  李英杰  李红阳  董培培 《地质通报》2018,37(10):1933-1943

内蒙古中部贺根山缝合带的梅劳特乌拉蛇绿岩中,新发现乌兰沟埃达克岩,岩性为花岗闪长岩。LA-ICP-MS锆石UPb测年结果表明,乌兰沟埃达克岩的侵位年龄为279.3±1.4Ma,其形成时代为早二叠世。乌兰沟埃达克岩SiO_2含量为65.92%~69.65%,MgO为1.34%~2.16%,Al_2O_3为15.30%~17.33%,Na_2O/K_2O值为3.95~14.09,Sr=359.60×10~(-6)~734.00×10~(-6),Yb=0.83×10~(-6)~2.02×10~(-6),Y=6.65×10~(-6)~12.84×10~(-6);富集K、Rb、Sr等大离子亲石元素,亏损Nb、Ta、Ti、P等高场强元素;稀土元素总量为32.18×10~(-6)~65.41×10~(-6),明显较低,轻、重稀土元素分馏明显,(La/Yb)N值为2.84~7.56,无明显Eu异常,显示出高硅埃达克岩(HSA)的地球化学特征。该埃达克岩具有岛弧型岩浆岩特征,形成于俯冲带岛弧环境,可能为洋内俯冲洋壳+俯冲深积物部分熔融并与上覆地幔楔橄榄岩反应成因。根据乌兰沟埃达克岩与梅劳特乌拉蛇绿岩的时空分布与演化特征,贺根山缝合带在早二叠世可能存在洋内俯冲作用。  相似文献   

Hydrochemical evolution of groundwater in a riparian zone affected by acid mine drainage (AMD), South China: the role of river–groundwater interactions and groundwater residence time     

Jing Wen  Changyuan Tang  Yingjie Cao  Xing Li  Qian Chen 《Environmental Earth Sciences》2018,77(24):794

Investigations were undertaken in the riparian zone near Shangba village, an AMD area, in southern China to determine the effects that river–groundwater interactions and groundwater residence time have had on environmental quality and geochemical evolution of groundwater. Based on the Darcy’s law and ionic mass balances as well as the method of isotopic tracer, the results showed that there were active interactions between AMD-contaminated river water and groundwater in the riparian zone in the study area. River water was found to be the main source of groundwater recharge in the northwestern part of the study area, whereas groundwater was found to be discharging into the river in the southeastern part of the study area throughout the year. End-member mixing analysis quantified that the contributions of river water to groundwater decreased gradually from 35.9% to negligible levels along the flow path. The calculated mixing concentrations of major ions indicated that water–rock reactions were the most important influence on groundwater quality. The wide range of Ca²⁺?+?Mg²⁺ and HCO₃^? ratios and the change of groundwater type from Ca²⁺–SO₄^2? type to a chemical composition dominated by Ca²⁺–HCO₃^? type indicated a change of the major water–rock reaction process from the influence of H₂SO₄ (AMD) to that of CO₂ (soil respiration) along a groundwater flow path. Furthermore, the kinetics interpretation of SO₄^2? and HCO₃^? concentrations suggested that the overlapping time of their kinetics triggered the hydrochemical evolution and the change of major weathering agent. This process might take approximately 8 years and this kinetic time will be continued when a steady source of contamination enter the aquifer.  相似文献   

冀北梁头岩体年代学和地球化学特征及对古亚洲洋闭合时限的启示     

王金芳  刘辰雨  陆泽芊  李康硕  宋宇桐  李英杰  陈公正 《地质论评》2024,70(1):2024010022-2024010022

华北板块北缘古亚洲洋闭合时间一直存在较大分歧,冀北张北梁头二长花岗岩体位于华北克拉通北缘中段,毗邻古亚洲洋构造域东南缘,对揭示古亚洲洋闭合时限具有重要启示。本文以梁头岩体为研究对象,开展了岩石学、地球化学、锆石U- Pb年代学和Hf同位素研究,探讨了其形成时代、岩石成因和构造环境。锆石LA- ICP- MS U- Pb测年表明,梁头岩体的侵位年龄为262. 5±2. 6 Ma,形成时代为晚二叠世。岩石学和岩石地球化学研究表明,梁头岩体具有较高的SiO2(70. 27% ~ 73. 89%),Na2O(4. 2% ~ 4. 55%),K2O(3. 87% ~ 4. 64%),Sr(417×10-6 ~ 827×10-6)含量,较低的Yb(0. 286×10-6~ 0. 518×10-6),Y(2. 74×10-6 ~ 6. 98×10-6)含量。岩石富集Sr等大离子亲石元素和LREE,亏损Ti、P、Nb、Ta等高场强元素和HREE,轻重稀土分馏明显(LaN YbN=15. 6 ~ 67. 3),具有弱的正Eu 异常。该岩石显示高锶低钇中酸性岩（Adakite, 埃达克质岩）的地球化学特征,形成于陆缘弧环境,为陆弧岩浆岩。锆石的εHf(t)值为-17. 50 ~ -11. 12,模式年龄tDM2为1989~2390 Ma。结合华北克拉通北缘晚石炭世—早二叠世陆弧岩浆岩的时空分布与演化特征,梁头陆缘弧二长花岗岩体的存在表明古亚洲洋在晚二叠世(262. 5±2. 6 Ma)可能仍处于向华北克拉通北缘的俯冲消减过程中,古亚洲洋闭合时间可能应在晚二叠世末。  相似文献   

Prospects of Carboniferous Shale Gas Exploitation in the Eastern Qaidam Basin   总被引：2，自引：0，他引：2  

LI Yingjie  SUN Yanling  ZHAO Yan  CHANG Chun  YU Qingchun  MA Yinsheng 《《地质学报》英文版》2014,88(2):620-634

Shale gas is a resource of emerging importance in the energy field. Many countries in the world have been making big financial investments in this area. Carboniferous shale in the eastern Qaidam Basin shows good exploration prospects, but limited research and exploration work for shale oil and gas resources has been undertaken. Geochemical analyses were performed on shale derived from the Upper Carboniferous Hurleg Formation in the eastern Qaidam Basin, Qinghai Province, and secondary electron imaging capability of a Field Emission scanning electron microscope(FE-SEM) was used to characterize the microstructure of the shale. The reservoir and exploitation potential of the studied shale was assessed by comparison with research results obtained from the Barnett Formation shale in Fort Worth Basin, North America and the Basin shale of Sichuan province. The results indicate that the eastern Qaidam Basin Carboniferous shale is high-quality source rock. There are four major microstructural types in the study area: matrix intergranular pores, dissolution pores, intergranular pores, and micro-fractures. The size of the micropores varies from 6–633 nm, the majority of which is between 39–200 nm, with a relatively small number of micro-scale pores ranging from 0.13–1 μm. The pore characteristics of the studied shales are similar to the North American and Sichuanese shales, indicating that they have good reservoir potential. No micropores are present in the organic matter, which is induced by its composition; instead we found an important lamellar structure in the organic matter. These micropores and microfractures are abundant, and are connected to natural visible cracks that form the network pore system, which controls the storage and migration of shale gas. This connectivity is favorable for shale gas exploitation, providing great scientific potential and practical value.  相似文献   

电测深法在撒哈拉沙漠地区找水应用     

唐英杰 《地下水》2014,(3):107-109

撒哈拉沙漠地区气候干燥,水资源缺乏,相应的地质、水文地质工作研究程度低,为水源地勘探工作带来很大困难。结合实例,采用电测深法,遵循从已知到未知原则,经过点、线、面逐步开展工作,总结含水层物性特征,划定主要含水区域,为水文工作的开展提供重要的基础资料。  相似文献