海洋中天然气水合物的成矿机理与资源评价概述

本文综述了近年来国内外关于天然气水合物成矿机理研究的新进展，阐明了作为一种非常规的天然气矿藏，其形成和稳定存在除了需要特定的温、压条件外，更需要合适的成矿地质条件，包括沉积构造环境、充足的气源、有效的运移通道、有效的储集层和保存条件等．文中还介绍了天然气水合物资源评价方法及国外研究者对全球气体水合物中甲烷量的估算值，由于其结果相差几个数量级，表明目前还没有成熟的天然气水合物资源定量评价方法．     

New Zealand lakes research, 1967–91

Research on New Zealand lakes over the past 25 years has focused mainly on eutrophication, measures of water quality, patterns, processes and production in plankton communities, and the spread and growth of submerged adventive macrophytes. Compared with most northern temperate lakes many New Zealand lakes show: low levels of inorganic nitrogen (N) and frequent N‐limitation of phyto‐plankton growth; diffuse, rather than point source, nutrient inflows; a great diversity of optical properties; unusual and often variable timing of plankton growth (attributed to the pervasive influence of New Zealand's oceanic climate); low productivity and biomass of zooplankton, which appear to be limited by food rather than predators; and sensitivity to invasion by adventive macrophytes. Notable research develop‐ments include improved methods of measuring nutrients, empirical predictive models that relate indices of eutrophication to nutrient loading, and significant advancements in methods of quantifying and measuring water colour and clarity.     

Landslide incidence zonation in the Rio Mendoza valley,Mendoza Province,Argentina

This paper presents a landslide incidence zonation map showing the percentage of underlying material involved in mass‐movement processes in the Rio Mendoza valley, Argentina. The landslide incidence zonation map was derived from an inventory map of landslides and reveals that many areas of the Rio Mendoza valley are implicated in this kind of process. A correlation has been found between the occurrence of landslides, earthquakes, and rainfall. The relation between lithology and landslides is clear: areas covered by friable sedimentary and volcanic rocks of the Choiyoi Group are prone to debris ?ows and complex landslides. The slope map has been ranked and a general relation between slope and type of event is shown. Falls commonly develop in high‐angle slopes. Copyright © 2004 John Wiley & Sons, Ltd.     

一种基于里程参数的道路平面几何解析模型

随着主动安全技术、自动驾驶技术的发展,高精度导航地图得到越来越多的运用。本文提出了一种面向高精度导航地图的、基于里程参数的道路平面几何解析模型。通过动态地构造点集上的正交多项式系和约束最小二乘法,根据拟合最大误差动态地计算道路的几何描述参数。使用该模型进行了120 km高速道路高精度地图数据生产,以三段典型道路为实例进行试验,表明该方法能对道路几何进行准确的描述,保证道路几何的连续与光滑,同时最大限度地减少数据冗余。该模型对高精度地图道路几何描述具有一定优势。     

Conceptual hydrodynamic-thermal mapping modelling for coral reefs at south Singapore sea

Coral reefs are important ecosystems that not only provide shelter and breeding ground for many marine species, but can also control of carbon dioxide level in ocean and act as coastal protection mechanism. Reduction of coral reefs at Singapore coastal waters (SCW) region remains as an important study to identify the environmental impact from its busy industrial activities especially at the surrounding of Jurong Island in the south. This kind of study at SCW was often being related to issues such as turbidity, sedimentation, pollutant transport (from industry activities) effects in literatures, but seldom investigated from the thermal change aspect. In this paper, a computational model was constructed using the Delft3D hydrodynamic module to produce wave simulations on sea regions surrounding Singapore Island. The complicated semi-diurnal and diurnal tidal wave events experienced by SCW were simulated for 2 weeks duration and compared to the Admiralty measured data. To simulate the thermal mapping at the south Singapore coastal waters (SSCW) region, we first adapted a conversion of industrial to thermal discharge; then from the discharge affected area a thermal map was further computed to compare with the measured coral map. The outcomes show that the proposed novel thermal modelling approach has quite precisely simulated the coral map at SSCW, with the condition that the near-field thermal sources are considered (with the coverage area in the limit of 20 km × 20 km).     

地图投影系统进一步补充的可能性——关于多圆柱投影

本文指出了地图投影分类系统中还有若干\     

甘肃省明长城资源调查专题地图技术方案探讨

介绍了甘肃省明长城资源调查中重要图件——专题图的制作方案和流程。基于GIS软件的优势,探讨利用空间基础资料结合专题数据制作专题地图的一种新思路,为甘肃省境内明长城的保护、研究与管理提供可靠依据。     

自组织金字塔模型的WMS客户端方法

提出了一种在客户端用金字塔模型建立WMS服务地图图像的本地缓存的方法,利用了GeoGlobe平台集成deegree 2.1-rc1的WMS服务,实现了在三维客户端环境中快速多分辨率动态显示的效果.     

明末清初我国测绘科技的人文社会背景分析——传教士与中国测绘科技的发展

通过对我国明末清初测绘科技的回顾 ,分析了明末清初西方传教士来华传教及科技交流对我国测绘科技的影响 ,对当时我国测绘科技发展的人文环境和社会背景做了深入探究 ,例举了清初我国与传教士合作开展全国地图测绘的全过程、取得的成果和使用的方法 ,在此基础上深入分析了这一时期测绘科技的辉煌成就及其因后期的“闭关主义”政策和“天朝中心说”的自大守旧等人文背景和文化传统及科技政策的失误所造成的诸多历史遗憾。