十年前,他组织了徒步走辽东长城

今年才四十岁出点头儿的刘欣,出生在沈阳,在辽宁读的大学,工作以后,经历颇多。在沈阳的银行干过,去深圳下过海,在报社杂志社工作过,涉足过出版业,在国内多家社团担纲组织工作,眼下在北京创办了欣欣向荣文化传播中心。     

基于泛在网信息的城市应急疏散决策研究

实时动态信息对城市应急疏散决策有着至关重要的意义,泛在网的发展使得获取城市实时动态信息变成现实.文中在分析城市应急疏散决策与泛在网特点的基础上,提出基于泛在网信息的城市应急疏散决策,设计基于泛在网的城市应急疏散决策概念模型,模型包含泛在感知层、泛在网络层、数据处理层、应用模型层、决策应用层.     

坚硬煤岩巷道中的粘点法

矿山测量工作者在井下测量二级导线时,一般都把测点固定在巷道顶板上。在坚硬岩顶或煤顶上,通常是在顶板上用焊子、     

测量坐标的转换问题

介绍了根据两个点在两个不同坐标系下的已知坐标来求其它点在另一坐标系中坐标的方法。有若干点在坐标系1下的坐标已知,其中有两个点在坐标系2下的坐标也已知,那么就可以通过这两点在两个不同坐标系下的坐标求出其它所有点在坐标系2下的坐标。本文介绍的就是这种方法,并阐述了在计算机上的实现方法。     

GIS数据在J2ME/J2EE集成中的传输研究

存储在Oracle9i Spatial中的GIS数据可实时为移动用户提供位置服务,本文研究了GIS数据在为MIDP移动用户提供位置服务的数据传输方案,在有线环境下采用XML格式传输,在无线环境下采用自定义格式,在带宽高的有线环境下保持了数据的可读性,在带宽窄的无线环境下尽量减少了传输的数据量,并在J2ME/J2EE集成环境中进行了测试和对比。     

微博

话题：少林寺海外壮大,在国外承办40余家公司 少林寺主持释永信：在国内没有做太多,重点主要在海外,我们的武僧和法师都用英语、德语、西班牙语在当地传播,海外发展壮大了,才能在国内有话语权。     

敬礼，珠穆朗玛峰——第二章 出发

决策，在反复酝酿中形成 新一轮珠峰测量早在一年多以前就在酝酿之中了。     

GPS定位技术在航空摄影中的应用

以下是国家土地测量局在航空摄影方面ＧＰＳ技术的应用目标：－为飞行员提供飞机在计划航线中的位置信息以便导航。－实现在预定的位置上自动曝光。－确定在预定的位置上自动曝光。－确定空中摄影机在曝光时的坐标。在１９８９年，１９９０年和１９９２年，用Ａｓｈｔｅｃｈ接收机做实验，以期获得ＧＰＳ在这方面应用潜能的一种概念。开发了用于导航和实现预定位置自动曝光的微机程序。在１９９１年航摄期，使用的飞机就装备了ＧＰＳ     

大香格里拉的世外桃源

多年前,一本由美国出版的"失落的地平线"游记在全世界尤其在亚洲引起了不小的轰动。关于书中所提到的香格里拉,其争议直到今天还在继续,不仅在     

印图工作先进技术操作方法介绍

前 言自从党中央提出在十五年或更短一点的时间内,在钢铁和其他主要工业产品的产量方面赶上或超过英国,在十二年内实现全国农业发展纲要的伟大号召以后,我们为了实现党对我们的期望,我厂提出在58年内,在成图方面,质量达到全国第一流的产品水平。我厂在局党委的正确领导下,制印处的大力支持与指导下在技术跃进计划方面获得了初步成绩和经验。这些经验一部份是学习苏联的先进经验,另一     

基于WebGL的三维智慧管网系统的设计与实现

随着城市面貌日新月异,地下管网的建设也在持续推进,作为城市的地下“神经网络”,全天24 h保障城市的正常运转和发展。本文以实现城市管网管理系统的高可用、无插件、智能化为目标,采用“地上地下一体”“二三维一体”的设计理念,研究基于WebGL的三维智慧管网系统的关键技术,实现了管线设施管理的信息数字化、空间化与图形化。     

GNSS的兼容与互操作初步研究

随着全球导航卫星系统(GNSS)的发展,特别是Galileo和QZSS计划的提出,卫星导航领域提出了兼容与互操作的概念,并日益受到重视。增强与已有系统之间的兼容与互操作已经成为GNSS的一种发展趋势,因此,有必要对GNSS的兼容与互操作展开研究。在简述GNSS的兼容与互操作提出背景的基础上,分析了相应概念之间的区别和联系。基于GNSS兼容与互操作的3个关键因素,分别分析了兼容与互操作在空间信号、时间框架、大地坐标框架选取方面的应用体现以及产生的影响。最后提出了目前GNSS兼容与互操作研究可以展开的几个方向。     

基于ArcIMS的校园WebGIS设计与实现——以内蒙古师范大学为例

在简要介绍了WebGIS主要实现模式和ArcIMS体系结构基础上,重点论述了基于ArcIMS的校园WebGIS系统平台的构建,实现了具有基本地图编辑、查询、图层操作与3维仿真显示等功能的内蒙古师范大学校园地理信息的网上发布,若能继续完善并与我校目前＂数字校园＂建设的显著成果相结合,对促进内蒙古师范大学＂数字校园＂工程的...     

On the Hipparcos Link to the ICRF derived from VLA and MERLIN radio astrometry

Positions and proper motions obtained from observations by the very large array (VLA) and the multi-element radio-linked interferometer network (MERLIN) are used to establish the link of the Hipparcos Celestial Reference Frame (HCRF) to the International Celestial Reference Frame (ICRF). The VLA and MERLIN data are apparently the latest ones published in the literature. Their mean epoch at around 2001 is about 10 years after the epoch of the Hipparcos catalogue and, therefore, the data are considered suitable to check the Hipparcos link established at epoch 1991.25. The parameters of the link, i.e., the angles of frame orientation and the angular rates of frame rotation, are estimated by fitting these parameters to the differences of the optical and radio positions and proper motions of stars common to the Hipparcos catalogue and the VLA and MERLIN data. Both the estimates of the angles of orientation and the angular rates of rotation show nearly consistent but insignificant results for all samples of stars treated. We conclude that not only the size of the samples of 9–15 stars is too small, but also that the accuracy of the radio positions and, above all, of the radio proper motions is insufficient, the latter being based on early-epoch star positions of low accuracy. The present observational data at epoch 2001 suggest that maintenance of the Hipparcos frame is not feasible at this stage.     

用CC的方法分析和解决一个常见的网络安全问题

CC导出PP的过程是一种安全评估通用语言到某类产品的具体应用过程,需要经过需求分析、得出安全目的、提出安全功能要求与安全保证要求等几个阶段。本文利用这些过程的基本方法和思想全面分析一个常见的网络安全问题,并按照保护轮廓的模式给出该网络的安全要求。     

Night on Earth: Mapping decadal changes of anthropogenic night light in Asia

The defense meteorological satellite program (DMSP) operational linescan system (OLS) sensors have imaged emitted light from Earth's surface since the 1970s. Temporal overlap in the missions of 5 OLS sensors allows for intercalibration of the annual composites over the past 19 years (Elvidge et al., 2009). The resulting image time series captures a spatiotemporal signature of the growth and evolution of lighted human settlements and development. We use empirical orthogonal function (EOF) analysis and the temporal feature space to characterize and quantify patterns of temporal change in stable night light brightness and spatial extent since 1992. Temporal EOF analysis provides a statistical basis for representing spatially abundant temporal patterns in the image time series as uncorrelated vectors of brightness as a function of time from 1992 to 2009. The variance partition of the eigenvalue spectrum combined with temporal structure of the EOFs and spatial structure of the PCs provides a basis for distinguishing between deterministic multi-year trends and stochastic year-to-year variance. The low order EOFs and principal components (PC) space together discriminate both earlier (1990s) and later (2000s) increases and decreases in brightness. Inverse transformation of these low order dimensions reduces stochastic variance sufficiently so that tri-temporal composites depict potentially deterministic decadal trends. The most pronounced changes occur in Asia. At critical brightness threshold we find an 18% increase in the number of spatially distinct lights and an 80% increase in lighted area in southern and eastern Asia between 1992 and 2009. During this time both China and India experienced a ∼20% increase in number of lights and a ∼270% increase in lighted area – although the timing of the increase is later in China than in India. Throughout Asia a variety of different patterns of brightness increase are apparent in tri-temporal brightness composites – as well as some conspicuous areas of apparently decreasing background luminance and, in many places, intermittent light suggesting development of infrastructure rather than persistently lighted development. Vicarious validation using higher resolution Landsat imagery verifies multiple phases of urban growth in several cities as well as the consistent presence of low DN (<∼15) background luminance for many agricultural areas. Lights also allow us to quantify changes in the size distribution and connectedness of different intensities of development. Over a wide range of brightnesses, the size distributions of spatially contiguous lighted area are consistent with power laws with exponents near −1 as predicted by Zipf's Law for cities. However, the larger lighted segments are much larger than individual cities; they correspond to vast spatial networks of contiguous development (Small et al., 2011).     

试论地图的艺术性

主要研究地图的艺术性 ,为使广大读者对地图的艺术性有一个全面的了解和认识 ,主要从以下三方面进行论述 :①地图的艺术性在现代地图发展中的重要意义 ;②地图艺术性的表现形式 ;③地图艺术性的形式及其发展趋势     

WebGIS数据组织发展研究

本文论述互联网GIS数据组织的发展状况。首先介绍了在WebGIS环境下空间数据的特点及其管理上存在的困难，并分析了目前实现WebGIS数据组织的几种技术及其优缺点，最后说明ontologies和RDF在WebGIS数据组织中的具体应用。     

Impact of the tsunami and earthquake of 26th December 2004 on the vital coastal ecosystems of the Andaman and Nicobar Islands assessed using RESOURCESAT AWiFS data

Tsunami waves struck the Indian coast on 26th December 2004 affecting the Andaman and Nicobar group of islands. A quick assessment of the status of the vital coastal ecosystems has been made using pre- and post-tsunami Advance Wide Field Sensor (AWiFS) data of Indian satellite RESOURCESAT with an accuracy of 87–90% and the Kappa ranging from 0.8696 to 0.9053. Among the coastal ecosystems the coral reefs have suffered the maximum with the Nicobar reefs (69% eroded and 29% degraded) bearing the brunt more than the Andaman reefs (54% eroded and 22% degraded). Significant improvement to the condition of the reef damaged due to backwash has been noted. About 41% of the Sentinel reef area has undergone significant improvement. The continuance of the erosion of the southwestern Andaman reefs is due to the impact of recurring earthquakes. The impact on mangroves of both the groups of islands has been due to uprooting as well as inundation of seawater and resulting stagnation. Changes are expected in community structure of mangroves as a result of tsunami.     

DMSP-OLS与NPP-VIIRS夜间灯光数据测算统计指标能力评估——以京津冀地区县域GDP、人口及能源消耗为例

夜间灯光数据记录了地球表面的人造灯光强度,是估计社会统计指标的有效手段之一。为了评估DMSP-OLS和NPP-VIIRS 2种夜间灯光数据对社会统计指标的模拟潜力,采用4种常用的灯光校正方法分别对2种夜间灯光数据进行灯光饱和性校正,根据校正后的夜间灯光数据分别建立与京津冀地区县域GDP、人口和能源消耗3种社会统计指标间的线性回归模型,从模型拟合的相关系数、F统计量值与概率p值中分析并评价了2种夜间灯光数据对GDP、人口和能源消耗3种社会统计指标的测算能力。本文研究结果表明：EANTLI法是2种夜间灯光数据的最佳校正方式,而HSI法不适用于夜间灯光数据校正后与县域社会统计指标的线性关系拟合2种夜间灯光数据对GDP的拟合效果都较好,NPP-VIIRS夜间灯光数据估算社会统计指标的拟合能力要优于DMSP-OLS数据。