新地震区划图地震构造区划分的原则和方法——以中国东部中强地震活动区为例

在新编全国地震区划图潜在震源区划分工作中,采用了三级划分的技术思路,即在地震统计区内先划分出地震构造区,以控制地震统计区内地震构造和地震活动的差异性,然后,在地震构造区内再进行潜在震源区划分。地震构造区划分是新编全国地震区划图潜在震源区划分工作中的一个关键环节。本文论述了地震构造区的定义、作用、划分原则和依据等。介绍了中国东部地区地震构造区划分方案,并以东北地震区和华南沿海地震带为例,对地震构造区划分方案进行了详细论述。     

Implementation of OGC web map service based on web service

OGC Web Map Service is one kind of OGC Portrayal Services belongs to OGC Web Service model and it provides multi-platform interoperability of spatial data set. This paper presents a method for implementing OGC Web Map Service based on Web Service technique and introduces the detailed process.     

Accuracy Assessment of the TOPEX/Poseidon Ionosphere Measurements

We conducted an assessment of the TOPEX dual-frequency nadir ionosphere observations in the TOPEX/Poseidon (T/P) GDR by comparing TOPEX with the Center for Orbit Determination in Europe (CODE) Global Ionosphere Map (GIM), the climatological model IRI2001, and the DORIS (onboard T/P) relative ionosphere delays. We investigated the TOPEX (TOPEX Side A and TOPEX Side B altimeters, TSA and TSB, respectively) ionosphere observations for the time period 1995–2001, covering periods of low, intermediate, and high solar activity. Here, we use absolute path delays (at Ku-band frequency of the TOPEX altimeter and with positive signs) rather than Total Electron Content (TEC). We found significant biases between GIM and TOPEX (GIM–TOPEX) nadir ionosphere path delays: ?8.1 ± 0.4 {mm} formal uncertainties and equivalent to 3.7 TECu) and ?9.0 ± 0.7 {mm} (4.1 TECu) for TSA and TSB, respectively, indicating that the TOPEX path delay is longer (or with higher TECu) than GIM. The estimated relative biases vary with latitude and with daytime or nighttime passes. The estimated biases in the path delays (DORIS–TOPEX) are: ?10.9 ± 0.4 {mm} (5.0 TECu) and ?14.8 ± 0.6 {mm} (6.7 TECu), for TSA and TSB, respectively. There is a distinct jump of the DORIS path delays (?3.9 ± 0.7 {mm}, TSA delays longer than TSB delays) at the TSB altimeter switch in February 1999, presumably due to inconsistent DORIS processing. The origin of the bias between GIM (GPS, L-band) and TOPEX (radar altimeter, Ku-band) is currently unknown and warrants further investigation. Finally, the estimated drift rates between GIM and TSA, DORIS and TSA ionosphere path delays for the 6-year study span are ?0.4 mm/yr and ?0.8 mm/yr, respectively, providing a possible error bound for the TOPEX/Poseidon sea level observations during periods of low and intermediate solar activity.     

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“智慧地图”体系构建研究

随着“智慧地球”“智慧城市”的发展,以及人类科学技术和对自然认识水平的提高,传统的空间信息显示与简单的数据存储、管理已不能满足我们对空间认知的需求,空间信息获取的广泛性、时效性、便捷性以及地图服务的智能化与人性化已经成为当前地图行业需求热点.同时,物联网、云计算等新兴信息技术的迅速发展所引爆的第三代信息革命为现代地图学的发展带来了新的契机.本文以地图学历史发展为主线,系统梳理“地图”的相关概念、内涵及技术理论,并结合当前经济、社会及技术背景,重新整合地图的发展需求、内涵及技术体系,提出一种全新的“智慧地图”概念,为现代地图学及数字地图技术的发展提供一种新的视角与理论方法框架.     

跨平台地图缓存一体化研究与应用

地图缓存技术是WebGIS中广泛采用的关键技术,然而不同平台的地图缓存应用给数据的生产和维护更新带来了诸多不便.针对此问题,本文从地图缓存的生成算法出发,研究了跨平台地图缓存一体化技术路线和实现方法,分别探讨了服务器端一体化和客户端一体化两种方式,旨在提高基础数据生成和应用服务的效率.结果表明本文的成果为实现跨平台缓存一体化提供了一种可行有效地解决办法.     

车载导航电子地图中语音提示应用与问题探讨

伴随着国家经济建设的飞速发展,我国城市建设也取得了长足的进步,交通网络四通八达,车载导航产品竞相上市,并成为解决定位服务的领先力量。作为车载导航的重要功能的路径规划与语音提示功能备受消费者关注。车载导航电子地图成为驾车出行不可或缺的辅助工具,尤其是车载导航电子地图的语音提示功能,已变得举足轻重,应用越来越广泛。本文主要就车载导航电子地图使用中语音提示问题进行探讨,并提出一些建议。     

地图审核存在的问题及解决办法

正确的国家版图是国家主权和领土完整的象征,是国家主权的体现形式。地图审核管理制度需要不断适应地图市场变化发展的趋势,公开地图表示内容必须严格符合国家保密管理要求,该文就地图审核内容需要进一步的确定,方法需要不断适应电子地图、互联网地图、移动地图、三维实景地图的发展趋势,审核后的监管应当探索信息化系统化的数据库管理模式等方面进行了探讨,以提高地图审核和管理的实效性。