雷达图在统计地图中的应用研究     

李慧芳  程雄  文婷  何川秀玥 《测绘与空间地理信息》2016,(9)

雷达图因其表现多指标统计数据时具有全面、清晰、直观、可读性强等特点,已成为经济财务领域中一种常见的统计数据表现方法,并逐渐拓展到其他领域,其中,以风向玫瑰图的形式在专题地图编制中得到了一定的应用。本文将对其特点进行深入研究,进一步拓展其在统计地图中的应用,以满足当今海量统计数据地图化的需求。  相似文献   

Lead,Sulfur, and Oxygen Isotope Systematics in Hydrothermal Precipitates from the 14°S Hydrothermal Field,South Mid‐Atlantic Ridge          下载免费PDF全文

Bing Li  Xuefa Shi  Chuanshun Li  Jixin Wang  Yanliang Pei  Jun Ye 《Resource Geology》2016,66(3):274-285

At the inside corner between the South Mid‐Atlantic Ridge (SMAR) and the Cardno fracture zone, the 14°S hydrothermal field, with its abundant silica‐rich sulfides, was identified as a volcanic massif, which provided the first opportunity to study inside corner‐related hydrothermal mineralization. S, Pb, and O isotopes were measured in hydrothermal sulfide samples from the two sites (volcanic top and slope sites) in the 14°S field. The homogeneous Pb isotope values (²⁰⁷Pb/²⁰⁴Pb = 15.466 ? 15.472; ²⁰⁶Pb/²⁰⁴Pb = 18.242 ? 18.252) and the δ³⁴S values (top site, +6.3 to +6.85‰; slope site, +2.37 to +3.36‰) suggest that the source of metals and most of the sulfur is the upper crust, whereas some sulfur is sourced from downward‐penetrating seawater, especially in the top site. The calculated oxygen isotope equilibration temperatures from quartz and seawater are between 94 and 144°C for the top site and between 179 and 196°C for the slope site. These isotopic proxies, together with geological background survey data, have an important implication: Discrepancies between the sites may result from variations in crust permeability, which also affect the mixing level between downward‐penetrating seawater and upward hydrothermal end‐member fluids and determine the various mineralization types.  相似文献   

S3M三维数据标准设计研究     

陆国伟  李广明 《测绘与空间地理信息》2017,40(Z1)

随着Web 3 D技术和大数据的发展,三维模型在Web端的传输和可视化成为迫切需求.面对Web端大数据实时传输这一挑战,超图三维团队在多年技术积累下,对倾斜摄影模型、3 DMax建模、BIM、矢量、三维管线以及单体化、实例化等内容进行整合,最终形成了海量三维数据规范——S3 M(SuperMap 3 D Model).通过这种高效、易扩展、可协作的数据规范,解决了三维数据传输和解析延迟问题,并通过WebGL支持硬件加速的可视化渲染技术,兼容多终端(移动、浏览器、桌面)的跨平台特性,最大限度地满足了用户需求.  相似文献   

面向分发服务的海量影像数据管理系统设计与实现     

许芳明 《测绘与空间地理信息》2017,40(7)

随着现代遥感技术的不断发展,影像数据的获取手段和类型越来越丰富,应用价值和前景也越来越大。随着基础测绘、三大平台建设的顺利推进,如何管理和应用好其获取和产生的海量影像数据已经成为地理信息成果管理工作的重点。本文针对省级地理信息成果数据管理部门业务流程,阐述了面向影像共享与分发服务需求的影像数据管理系统的建设思路与方法。  相似文献   

MICAPS4预报业务系统建设进展与未来发展   总被引：7，自引：6，他引：1       下载免费PDF全文

高嵩  毕宝贵  李月安  王若曈  代刊 《应用气象学报》2017,28(5):513-531

以精细化预报为标志的现代天气预报业务对高时空分辨率气象数据的应用提出了更高的需求,而传统的预报分析制作系统MICAPS3（Meteorological Information Comprehensive Analysis and Processing System Version 3）无法满足符合大数据特征的实时预报相关的数据应用。同时,模式预报和集合预报应用已在各专业预报领域中发挥越来越重要的作用,网格预报产品正在涵盖全部的预报业务流程,而MICAPS3无法提供便捷高效的支撑。为解决上述问题,国家气象中心启动了MICAPS4建设,一方面建立了基于大数据的气象实时预报应用技术体系,解决了气象大数据处理、存储、分析和显示效率的关键技术难题;另一方面搭建了多个满足不同复杂预报业务需求的专业化版本。MICAPS4将信息化技术与预报技术、预报业务流程紧密结合,解决了现代化预报方法的平台化集成应用与精细化预报制作的关键技术难题,基于MICAPS4基础框架的多个专业版在中央气象台和部分省级气象台进行业务化应用推广。基于CIMISS（China Integrated Meteorological Information Sharing System）-MICAPS4的海量数据存储环境,极大减轻了系统部署和本地化工作量,显著提升了数据解析及数据存储访问效率。  相似文献   

一种大规模空间数据流式并行处理方法研究   总被引：3，自引：2，他引：1  

刘纪平  吴立新  董春  张福浩  亢晓琛 《测绘科学》2016,41(1):89-93,75

针对空间数据的读写(I/O)时间占比过高问题,文章提出一种流式并行化方法:通过将空间计算过程与数据I/O过程相重叠,使传统并行空间计算方法中的性能提升瓶颈得到显著缓解;并且,方法所采用的数据分片策略,能够使数据单次I/O所产生的高内存使用率得到降低,进一步提高了具体地学算法的适用性。最后以地理国情普查基本统计分析中地表面积计算为例进行验证,结果表明:该算法的计算效率与内存使用率相对于直接并行方法均获得明显改善,且空间数据流式并行处理方法与具体地学算法耦合度低。该方法已成功应用于多个其他统计分析算法中。  相似文献   

Effects of potassium sulfide content in marine diesel fuel oil on emission characteristics of marine furnaces under varying humidity of inlet air   总被引：1，自引：0，他引：1  

Cherng-Yuan Lin  Wei-Cheng Chen 《Ocean Engineering》2006,33(8-9):1260-1270

Degraded fuel oils are generally used in marine power plants for economic purposes, so as to reduce operating expenses. These marine fuel oils commonly contain various oxides or sulfide compounds of metallic elements in the fuel ash, and affect the combustion and emission characteristics of marine power plants to different extents. Moreover, marine power plants are more often operated in a highly humid environment. As a result the emission and burning process may also be altered by the various humidity level of the inlet air. The effects of potassium sulfide in marine diesel on the combustion and emission characteristics of marine furnaces under varying levels of relative humidity of inlet air were experimentally investigated in this study. A cylindrical industrial furnace made of AISI 316 stainless steel, and an automatic oil-fired burner were used for the emission characteristics measurements and observation. A mechanically homogenizing machine was used to stir potassium sulfide (K₂SO₄) powder and marine diesel with a preset K₂SO₄ concentration. The relative humidity of the inlet air and temperature were adjusted to their assigned values by a large-size air conditioner before being pumped into the burner. The marine diesel oil mixture was atomized by the inlet air consequently ignited by an electrode and then burned within the horizontal furnace. There were eight rectangular slots cut in the upper portion of the furnace wall so that the probes of a gas analyzer and a thermocouple could be inserted into radial positions in the cylindrical furnace. The concentrations of gas emission and burning gas temperature and the combustion efficiency were analyzed. The experimental results show that the burning gas temperature, carbon dioxide emission and combustion efficiency decreased when the concentrations of excess air and oxygen emission increased with the addition of potassium sulfide in the marine diesel fuel. This is primarily attributed to the fact that the sulfide of an alkali compound such as K₂SO₄ may suppress the oxidation reaction process, leading to inferior combustion characteristics.  相似文献   

The relationship between seagrass (Posidonia oceanica) decline and sulfide porewater concentration in carbonate sediments   总被引：2，自引：0，他引：2  

Maria Ll. Calleja  Núria Marb  Carlos M. Duarte 《Estuarine, Coastal and Shelf Science》2007,73(3-4):583-588

In this study we test the hypothesized negative relationship between seagrass status and porewater hydrogen sulfide (H₂S) levels, through a comparative analysis within a range of seven Posidonia oceanica meadows growing over carbonate sediments in the NW Mediterranean Sea around Mallorca Island. The studied meadows range from meadows growing on sediments with very low sulfide porewater concentrations (4.6 μM) to those growing over higher sulfide conditions (33.5 μM). Organic matter content, sulfate reduction rates and sulfide porewater concentrations in the sediments were determined concurrently with the assessment of demographic plant dynamics (specific mortality and net population growth rates). Sulfide porewater concentration increased with increasing organic matter content in the sediment, while net population growth decreased significantly with low increases of sulfide concentrations. Our results confirm the previously suspected vulnerability of seagrass meadows growing on carbonate sediments to increased sulfide levels. An excess of 10 μmols H₂S L⁻¹ porewater is identified to already conduce P. oceanica meadows to decline, which this study identifies, particularly, as strongly sensitive to sulfides. The results reported here suggest that even moderate increases in organic carbon inputs may lead to enhancement of dissolved sulfides and may be an important factor for seagrass status in these iron-depleted carbonate sediments from the Mediterranean Sea.  相似文献   

Mats of Beggiatoa bacteria reveal that organic pollution from lumber mills inhibits growth of Zostera marina     

Joel K. Elliott  Erin Spear  & Sandy Wyllie-Echeverria 《Marine Ecology》2006,27(4):372-380

The objectives of this study were to determine the distribution and abundance of Zostera marina (eelgrass) in relation to the distribution of the mat forming bacteria Beggiatoa spp., and the levels of sulfide and organic material (wood waste) in the sediment. Underwater videography and intertidal surveys were used to map the distribution and abundance of Z. marina beds and Beggiatoa in the nearshore area of Commencement Bay, WA (USA), a location that has a long history of sawmill activity. Zostera marina occurred from the intertidal to ?6 m mean lower low water (MLLW) on sandy substrates in areas with low levels of sulfide (<50 μm ) and organic material (<5 % total volatile solids). Areas with high sulfide levels (>200 μm ) occurred where there were significant amounts of organic material in the sediments, which was found to be wood waste that had been discarded from sawmills. Zostera marina was absent from the intertidal and occurred at lower densities in areas with high sulfide levels. In contrast, mats of Beggiatoa were only found in areas where the sulfide levels were >1000 μm and there were significant deposits of wood. Thus, the negative correlation between the distribution and abundance of Z. marina and Beggiatoa suggests that the presence of Beggiatoa mats could be used as a biological indicator of inhibiting levels of hydrogen sulfide in the marine environment.  相似文献   

冲绳海槽Jade热液区块状硫化物中流体包裹体的氦、氖、氩同位素组成   总被引：3，自引：1，他引：3       下载免费PDF全文

曾志刚  秦蕴珊  翟世奎 《海洋学报》2003,25(4):36-42

对冲绳海槽Jade热液区块状硫化物中流体包裹体的氦、氖和氩同位素组成进行了测定,流体包裹体的3He/4He比值为(6.2～10.1)Ra,均值为7.8Ra,与大洋中脊玄武岩一致[3He/4He≈(6～11)Ra],20Ne/22Ne比值为10.7～11.3,明显高于大气值(9.8),而40Ar/36Ar比值的变化范围在287～334之间,接近大气值(295.5),这些结果表明,块状硫化物中热液流体捕获的稀有气体是地幔和海水源组分混合的产物,且流体包裹体中的氦主要来自地幔,氖和氩主要来自海水。  相似文献