QTPV data model and algorithm and its application to geological exploration engineering

3D spatial data model and simulating are the core of 3D GIS can be adopted in different domains. A data model based on Quasi Tri-Prism Volume (QTPV) has been proposed. QTPV definition and its special cases have been discussed. Using QTPV and its special cases, irregular natural geological bodies and regular subsurface engineering can be described efficiently. The proposed model is composed of five primitives and six objects. Data structures and topological relationship of the fives primitives and three objects describing stratigraphy are designed in detail. Some schemes are designed for the QTPV modelling of stratigraphy and subsurface engineering according to modelling data. The model manipulation method of QTPV cutting by an arbitrary plane is discussed. Using VC++ 6.0 programming language integrated with SQL database and OpenGL graphic library under windows environment, a system prototype 3DGeoMV has been developed. The experiment result shows that the QTPV model is feasible and efficient in modelling subsurface engineering.     

区县级自动化管理的土地储备信息平台建设探讨

土地资源是地球资源的重要组成部分,目前全球城市化进程正快速推进,土地资源已成为城市资源的重要组成部分,土地资源在城市发展中占用重要的作用.城市建设快速发展的同时,基础薄弱、城市控规覆盖范围小、土地储备开发信息化基础差等现实问题,造成土地征收、整合、储备、出让周期长、效率低,无法满足城市快速发展对土地的应用需求.为解决以...     

基于云架构的自然资源与地理空间数据库建设

基于云架构的省级自然资源与地理空间数据库建库技术涉及面极为广泛,需要在现有的技术条件、硬件设备条件、人力条件、资金条件的基础上,综合分析考虑海量自然资源和地理空间数据的关联关系以及建库规则,提出可行的、数据安全的、高可用的、易于实施维护的数据库构建方案.本文通过分析市场上的主流云平台以及云数据库解决方案,从云空间数据库...     

村落的形成时间及空间分布特征研究——以广州市增城区为例

主要研究我国村落的形成及空间分布特征.村落形成初期主要集聚在平原、河流沿线等水域丰富、地形平缓地区,后期因其他因素往沿海地区不断迁移.本文实例研究中,以广州市增城区自然村落为研究对象,梳理了自唐代至新中国成立期间在增城开村数量的变化及其在空间上的分布特征.增城村庄开居经历了慢速发展、稳定发展、快速发展、平稳发展和阻滞发展等5个发展时期.从迁移地看,前期主要从中原地带迁来,后期主要从广东及周边城市迁来等特征;从空间分布上看总体上呈现出南密北疏、平原密山区疏的分布特征.     

江苏省国土资源省-市-县三级联动政务管理系统总体框架设计

本文在回顾全省国土资源电子政务建设历程、分析当前信息化不足和面临形势的基础上,立足全省,设计了省-市-县三级联动政务管理系统框架,提出了三种全省系统应用模式并进行优劣分析,基于SOA设计了三级政务协同平台结构。     

Mobilization and redistribution of elements in soils developed from extreme weathering basalt on Hainan Island

Major, trace and organic elements of a South China were reported to investigate elements laterite profile developed on Neogene basalt on Hainan Island, mobilization and redistribution in tropical regions. The results indicate that strong acid environment and organic matter （OM） can remarkably improve the transfer of insoluble elements. Among all the elements, Th is the least mobile. As for the general conservative elements during incipient chemical weathering, such as Ti, Zr, Hf and Nb, the removals are up to 30%-40% in the upper profile. And for Fe, A1, Cu and Ni, that tend to be combined with secondary minerals and to be retained in temperate zone, they are re- moved from the upper profile, transferred downwards, and then precipitated in the lower profile. In addition, atmos- pheric inputs, including sea salt aerosols and dust, have a profound effect on the budgets of elements that are susceptible to leaching losses （e.g. K, Na and Sr）. Excluding the possibilities of groundwater and erosion, the remarkable increase of K, Na and Sr concentrations in the upper profile, together with dramatically upward increasing trends of the percentage changes of Sr/Th, K/Th and Na/Th ratios, show that atmospheric inputs, especially sea salt aerosols, contribute much extraneous seawater derived elements, such as K, Na and Sr to the soils. The overall elemental be- haviors in this profile suggest that organic matter and atmospheric inputs play a very important role in the mobiliza- tion and redistribution of elements during extreme weathering in tropical regions.     

苏南地区城乡聚落空间演化过程及其格局特征

当前,城乡聚落空间正由自然和经济社会条件存在差异的等级体系转变为密切联系的网络化结构,城乡融合已经成为中国城乡聚落空间演化发展的重要方向。以苏南地区为例,对20世纪90年代以来的城乡聚落空间演化过程及其格局特征进行分析,发现2000年以后城镇聚落扩张强度远高于乡村聚落,城乡聚落空间结构可进一步归纳为集中、双心、多核和密集4种基本格局。该研究对乡村振兴背景下的城乡聚落空间优化布局具有一定指导作用。     

西藏樟木堆积体结构及其稳定性

樟木口岸是我国与尼泊尔王国之间唯一的陆路通商口岸,也是西藏地区目前唯一具有一定规模的国际贸易口岸,但该口岸坐落于一大型堆积体之上,长期面临地质灾害的威胁。为进一步论证该堆积体的稳定问题,本文在野外调查基础上,对该堆积体的工程地质结构、岩土类型以及斜坡的变形破坏规律和稳定性进行了初步分析。结果表明：该堆积体并非单一土质结构,尚存在冰水堆积等类型,斜坡发生整体滑坡的可能性小,以地形坡度、人类工程活动等控制的局部滑移为主。     

华东部分铀矿区内大气和饮用水体放射性水平调查研究

通过对华东地区２１ 个铀矿区内居民居住环境大气中氡及其子体α潜能浓度的调查,结果表明：居民居室外氡浓度均值范围为６．７３—１３２．９ Ｂｑ／ｍ ３,氡子体α潜能浓度均值范围为１１．０—７８．８ｎＪ／ｍ ３。居室内的平均氡浓度均值范围为１４．５—１８５．８ Ｂｑ／ｍ ３,氡子体α潜能浓度均值范围为１３．８—１０４．２ ｎＪ／ｍ ３;对居民饮用水源的取样分析表明,铀浓度均值范围为０．１２—１．６８ μｇ／Ｌ,钍浓度均值范围为０．０２—０．４２ μｇ／Ｌ,镭－２２６ 浓度均值范围为０．９０—１２．１ ｍ Ｂｑ／Ｌ,与全国和当地的放射性天然本底水平比较接近,均属正常本底水平。