大数据下面向房地产便利性的综合指数模型     

孙华涛  尹章才  陈雪菲  刘清全 《测绘科学》2017,42(2)

针对房地产便利性描述信息缺少量化和难以比较的问题,该文提出了一种利用大数据测度房地产便利性的综合指数模型。房地产便利性的描述信息往往是定性描述的、单一或单方面的,缺乏综合或整体的定量化评价,从而给不同房地产之间在便利性方面的横向比较造成了困难。该文在引入步行指数概念基础上,通过对便利设施的分类、分级以及便利设施与房地产之间步行距离的定量计算,获得综合衡量房地产便利性的一种实数型指数。基于百度在线地图的实验结果表明:所提模型可以自动测度任一房地产的便利性指数。  相似文献   

基于GIS主题爬虫的在线房产估价系统与优化     

董浩然  谢欢  陈鹏  洪中华  童小华 《地理信息世界》2016,(2):107-112

房地产估价的常用方法是将估价对象与邻近估价时点和邻域空间的类似房地产进行比较,从而估算其客观合理的价格,这需要用到大量的可比房产价格数据。GIS主题爬虫的应用可以有效解决目前房产估价所面临的数据缺乏、效率低下等问题。该文综合运用主题爬虫、网页解析技术、数据库技术、Web技术和GIS技术进行房产数据的提取、存储、空间分析,并利用所提取的实时房产交易案例进行房产价格估算;设计并实现了一个具备房产地理位置查询、房屋基本属性查询、房屋价格估算、房产批量评估等功能的房产信息实时更新与处理系统。最后对该系统做了前端、后台及数据库的优化,在某公司的估价业务工作中得到了实际应用,并取得了良好的用户体验效果。  相似文献   

塔里木盆地和田1井中寒武统膏岩层段发现原生白云石   总被引：1，自引：0，他引：1  

王小林  胡文瑄  张军涛  朱井泉  万野 《地质论评》2016,62(2):419-433

岩石学与地球化学研究表明,塔里木盆地和田1井中寒武统膏岩层中白云石为原生白云石。岩石学特征上,白云石晶体微小,属隐晶—微晶(5μm),呈他形—次圆形,并且不含灰质前驱物。白云石与自生石膏有密切联系,根据其与石膏的关系及岩石学特征,可以将其分为两类:A类原生白云石,包裹在石膏内,晶体较大,一般大于3μm;B类原生白云石,石膏分散在其中,具有极好的长柱状晶形,白云石晶体较小,一般小于3μm。地球化学特征上,两类白云石差别也较明显。A类白云石具有高的n(Mg)/n(Ca)比,平均为0.96,接近化学计量白云石。Na_2O,Sr O,Fe O,Mn O平均含量分别为160μg/g,270μg/g,2250μg/g,120μg/g。δ~(13)C(PDB)与δ~(18)O(SMOW)平均值分别为0.3‰,24.6‰;与A类原生白云石相比,B类原生白云石n(Mg)/n(Ca)比较低,平均值为0.90。具有较高的Na_2O,Fe O,Mn O含量与稍低的Sr O含量,平均值分别为290μg/g,2540μg/g,200μg/g,200μg/g。δ~(13)C(PDB)与δ~(18)O(SMOW)变化不大,δ~(13)C稍低,平均值为-0.3‰,δ~(18)O值较高,平均值为25.2‰。研究表明,文中白云石为原生沉淀,而非交代前驱物灰岩形成,Mg的来源为强烈蒸发形成的高盐度咸水。微生物可能参与了白云石沉淀过程。  相似文献   

不动产统一登记的困难与解决方案初探     

湛国毅 《测绘与空间地理信息》2016,(3):178-180

分析了国内外不动产登记的历史发展和国内管理现状,总结了当前不动产管理难点,探索性提出了统一管理体制、健全法规、打破利益阻碍、提高人员素质、解决技术瓶颈等不动产登记的方案。  相似文献   

基于《不动产权籍调查技术方案(试行)》的相关问题探析     

伍友俊 《测绘与空间地理信息》2016,(3)

不动产权籍调查测绘工作是不动产登记的基础,不动产权籍调查测绘相关技术规范和标准则是顺利开展不动产权籍调查测绘工作的重要保证。本文针对《不动产权籍调查技术方案(试行)》涉及的测绘基准、宗地图和房产分户图的相关问题进行探析,建议应一步到位,统一采用2000国家大地坐标系等测绘基准,按不动产单元编码方法统一宗地图与房产分户图中的房屋幢号,完善宗地图和房产分户图的内容,使不动产权籍调查测绘成果更具科学性、实用性、权威性、法定性和协调性,打牢不动产登记的技术根基,促进不动产登记"四统一"工作。  相似文献   

浅谈Y/DCK-2修测车检测点布设与量测     

刘国庆  于晓光  李坤阳 《测绘与空间地理信息》2016,(6):184-186

移动测量系统采集的地物目标空间坐标精度是保证其产品质量重要指标之一,能为实景地图在导航中的准确定位提共最可靠的质量保证,《实景地图作业细则》中规定了必须进行野外数据精度检测,以保证野外测量成果的精度符合要求。本文主要对野外检测点绝对检测方法进行了实践和探索,通过分析研究,提出了几点改进意见。  相似文献   

闽中梅仙铅锌矿田赋矿变质岩系对比及深部找矿前景     

李秋金  李金梅  王芳 《江苏地质》2016,40(2):234-242

梅仙铅锌矿田形成于闽中大陆裂谷环境中,铅锌矿体主要赋存于中新元古代马面山群东岩组绿片岩相的变质岩系内,层位和岩性控制特征显著。在充分研究前人成果的基础上,通过对马面山群变质岩层序及地球化学特征的分析研究,对梅仙地区铅锌矿赋矿变质岩系地层进行了划分对比,认为梅仙矿田中新元古代马面山群变质岩系自老至新为龙北溪组、东岩组。龙北溪组为下伏于东岩组的一套巨厚的海相硅质、钙镁质、半黏土质、泥砂质沉积变质岩系,间隙有小规模的基性—超基性岩浆喷发。东岩组为一套具多个旋回的"双峰式"(基性—中酸性)火山喷发与泥钙质沉积的喷发—沉积序列。研究认为,丁家山矿区与峰岩矿区的赋矿变质岩系并非同一层位,而是下伏于其下的含矿岩层,峰岩矿区深部具备寻找丁家山式铅锌矿床的前景。  相似文献   

Large‐scale connectivity of Grapsus grapsus (Decapoda) in the Southwestern Atlantic oceanic islands: integrating genetic and morphometric data          下载免费PDF全文

Mariana M. Teschima  Patrícia R. Strӧher  Carina R. Firkowski  Marcio R. Pie  Andrea S. Freire 《Marine Ecology》2016,37(6):1360-1372

The degree of connectivity among island populations can influence their demography and affect their level of genetic differentiation. In this study we investigated genetic and morphometric differences among four populations of Grapsus grapsus (Linnaeus 1758), in Saint Peter and Saint Paul Archipelago (0°55′ N, 29°20′ W), Fernando de Noronha Archipelago (3°50′ S, 32°24′ W), Rocas Atoll (3°50′ S, 33°49′ W) and Trindade Island (20°30′ S, 29°20′ W) from 2003 to 2011. Morphometric results indicated the existence of two distinct groups based on the morphology of their chelae (Trindade Island/Saint Peter and Saint Paul Archipelago versus Fernando de Noronha/Rocas Atoll). In addition, genetic variation in a fragment of the mitochondrial control region revealed substantial differentiation between Trindade and the other islands, with Trindade Island showing only exclusive haplotypes. The congruence of the genetic and morphologic analyses suggests the occurrence of a divergent population in Trindade Island as well as high connectivity among the three remaining equatorial islands. This is the first study to assess the level of morphologic differentiation and genetic connectivity of a species among all four Southwestern Atlantic oceanic islands. Our results provide valuable insight into understanding connectivity through surface ocean currents and suggest that the unstable current system of this area could be responsible for different dispersal patterns. We also suggest that the design of Brazilian marine protected areas should be adjusted to provide stronger protection for Trindade Island as it harbors unique genetic and morphologic variation in G. grapsus.  相似文献   

江西省下行气象资料实时监视平台设计与实现     

李显风  邓卫华  邹海燕  何瑶  赵艳 《气象科技》2016,44(2):229-233

下行气象资料是省级气象部门重要的数据源。在分析下行气象资料接收流程基础上,提出了江西省下行气象资料实时监视平台的构建思路。基于日志分析,采用MVC架构、SQL Server数据库和HTML、JavaScript等Web技术对平台进行设计与实现。平台实现了对江西省实时下载资料和CMACast系统广播资料等下行气象资料的实时监视。平台具有对下行气象资料年、月、日和任意时段的统计分析和对后台日志处理系统的异常报警。平台投入业务应用后,大大提高了江西省下行资料接收和监控效率。  相似文献   

Powerful unconfined turbidity current captured by cabled observatory on the Fraser River delta slope,British Columbia,Canada          下载免费PDF全文

D. Gwyn Lintern  Philip R. Hill  Cooper Stacey 《Sedimentology》2016,63(5):1041-1064

Turbidity currents are one of the main sediment transport processes on Earth, yet are notoriously difficult to monitor directly. This article presents the first direct and high bandwidth observation of a turbidity current using a cabled sea floor observatory. On 5 June 2012, a platform on Ocean Networks Canada, located in 107 m of water on the Fraser River delta slope, was displaced downslope and severed from its data cable. The platform weighed ca 1000 kg in water. The event took place during high river discharge, high tides and rapid sediment accumulation on adjacent upslope areas of the sea floor. Data recorded as it tumbled downslope allow a reconstruction of the flow, which is inferred to have been an unconfined turbidity current. Lines of evidence indicate that the flow came in as a bed hugging wedge, and built up to between 1 m and 4 m in height as the head passed through. Comparison with laboratory data suggest that the flow was initially supercritical. While the adjacent slope offset to the north clearly exhibits change over an annual resurvey period, the bathymetry directly at the event location show no resolvable change over a period from seven months before the event to one month after. Sediment cores collected after the event were pervasively biototurbated and they contain no obvious deposit connected with this event. The remarkable aspects of this research follow. The flow was powerful enough to carry a 1 tonne platform and sever a heavily armoured cable. The current occurred on the unchannelized open slope. This powerful event failed to cause discernible seabed elevation change. The flow was triggered by tidal conditions. The event was detected by a purpose‐designed cabled observatory, thus providing high bandwidth data and also alerting researchers in real time to mount follow‐on investigations.  相似文献