DZJ2激光垂准仪使用方法及指标的校正

介绍了DZJ2激光垂准仪的性能及基本指标的校正方法,为用户在使用DZJ2激光垂准仪过程中几种基本指标参数的校正提供参考.     

t-GIS and environmental dynamic models

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Simulating Temporal Fluctuations of Real Estate Development in a Cellular Automata City

This research aims to understand the source of temporal fluctuations in real estate development through simulating a cellular automata model. In this cellular automata city, investment decisions are made according to the profitability measured in a local neighbourhood. If developers think there is enough of a profit margin in a particular site, i.e. a 'niche' of investment, they will increase investment at that site. However, by increasing investment at the site, new 'niches' might be created. Therefore, the action of converging towards an equilibrium state itself paves the way towards new fluctuations. This model demonstrates the potential of using simulation to increase our understanding of real estate dynamics. The experiments suggest that locally made 'rational' decisions can lead to temporal fluctuations because of non–linearity (discrete changes/densification and local bounded information). Interestingly, the fluctuations may show the property of a temporal fractal. This requires a sufficiently sensitive process of 'niche' formation compared with a relatively large impact of additional investment. The simulation suggests that the impact should be 4 to 20 times higher than the threshold over which a niche will be formed. This condition is satisfied in most cases of real estate investment, thus suggesting a self–organised criticality in complex real estate development.     

“中国地壳运动观测网络”区域网GPS联测数据的处理

介绍了“中国地壳运动观测网络”1999年区域网GPS联测数据的基本情况 ,并采用所给定的处理方案对此次联测数据进行了处理。计算结果表明 :点位坐标重复性在南北方向为 2 .0mm ,东西方向为 3.0mm ,高程方向为 5 .6mm ;基线重复性达到 1.76mm +1.78L× 10 -9mm ,基线分量重复性南北方向为 1.4 0mm +1.0 5L× 10 -9mm ,东西方向为 2 .14mm +1.5 6L× 10 -9mm ,高程方向为 4 .6 9mm +2 .18L× 10 -9mm     

Investigating the land use characteristics of urban integration based on remote sensing data: experience from Guangzhou and Foshan

Abstract

Urban integration is an increasingly popular phenomenon. It is important to characterize the dynamic processes of urban integration from the perspective of geography. However, previous studies mainly focussed on the overall characteristics of a single entity and failed to consider inter-city influences. Therefore, this study aims to systematically investigate this phenomenon. Firstly, spatial clustering technique and landscape metric were used to analyze the temporal change of spatial layout. Secondly, we built multiple ring buffers of city boundary to reveal the directional differences in urban expansion. Lastly, we compared the observed land use data with the results simulated by cellular automata model. These experiments have shown that the urban expansion characteristics during the urban integration process are rather different from those of a single city, and the above methodology can effectively characterize the urban integration phenomenon. The successful example of Guangzhou–Foshan integration could also provide practical experience for other similar attempts.     

超站仪技术在复杂地形测量中的应用研究

由于很多施工区域的地形较为复杂,对测量工作提出了新的要求,除改进常规测量方法外,同时需要更高效的仪器提供技术保障.本文以震后四川省九寨沟县鲜浒沟地质灾害工程1:500地形测绘项目为例,介绍了超站仪在地形测量中的应用原理,结合施工区,讨论了其实施方法、注意事项、对测量成果的重复性、复现性等问题进行了分析,提出了复杂地形测...     

基于MapXtrme2004的WebGIS系统的研究与开发

本文通过介绍.NET框架用于Web开发的主要技术ASP.NET和ADO.NET的技术优点以及MapInfo公司针对.NET环境开发的新组件Mapxtreme2004,通过分析Mapxtreme2004的结构组成总结了Mapxtreme2004用于WebGIS开发的主要方法类的用途,并着重研究了在.Net框架下利用Mapxtreme2004进行WebGIS开发的可行性及主要功能特点。     

机载LiDAR技术

机载LiDAR集成了GPS、IMU、激光扫描仪新一代航空遥感系统,能利用飞行获取的原始数据直接生成DEM和正射影像图,而无需任何或仅需少量的地面控制点。与传统的摄影测量技术相比,机载LiDAR可以节省大量的人力、时间和经费。在过去十年,机载LiDAR作为精确、快速的地球表面三维测量方法已得到广泛的认同,本文详细介绍了机载LiDAR的基本原理、技术结构及数据处理流程。     

国家1:50000数据库更新工程总体设计研究与技术创新

为了全面提高1:50000数据库的信息现势性和要素完整性,我国"十一五"期间组织实施了国家1:50000数据库更新工程.介绍该工程总体技术研究与技术创新工作,包括研究设计以地形数据全要素更新、全区域变化检测和全过程质量控制为主要特征的1:50000数据库全面更新模式,研究提出符合我国大面积快速更新实际需要的缩编更新优先、影像一体化更新为主的主体更新方法,设计研制规模化更新所需的生产技术系统,制定配套的生产技术规定,建立规模化更新生产业务体系,并在全国大规模更新生产中广泛使用.

Abstract：

The currency of geographic data refers to its consistency with respect to the real world, and plays a criti-cal role in geographic information service and applications. In order to improve the quality of geographic informa-tion service, State Bureau of Surveying and Mapping of China had launched a five year's national campaign to up-date 1 : 50000 topographic database. This paper outlines the master design and technical development of this na-tional updating engineering, which adopts a full coverage updating strategy characterized by all element topo-graphic data modeling, change detection in all related areas, and whole process data quality controlling. High resolution image-based updating and large-scale data generalization-based updating were developed and used as two majors updating techniques, a series of technical production specifications were made, Based on the above, a technical system for large scale updating production, mainly including image based updating software and data generalization based updating software, has been developed and equipped to a large number of production units. The new technical pro-duction system has been successfully implemented in national campaign to update 1 : 50000 topographic database.     

地质灾害变形监测系统开发及应用

地质灾害监测环境非常复杂,特别是在恶劣天气下,传统周期性变形监测的方法不能够实时获取地质灾害所处的状态。根据传统变形监测工作流程及相应的质量技术要求,结合变形监测规范的要求和实际生产习惯,研制了基于测量机器人集机载控制网观测、变形监测自动数据采集、数据处理、精度统计、手薄报表输出、数据平差、分析预测预报于一体的变形监测数据处理系统DMPS,并应用湖北省黄冈市白莲河抽水蓄能电站的边坡监测。