浅谈数字地形图的制作流程及其质量检查系统

介绍了地形图数字化过程中的几项关键技术及地形图数据质量的重要性,详细描述了数字地形图质量检查的内容及目前采用的质量检查方法,并指出了现有检查方法的缺点,并结合生产实际研究了一种人机交互式的检查系统。     

地形图数字化测绘成果质量检查与评定的实施

本文主要介绍了测绘生产单位对地形图数字化测绘成果最终质量检查与评定的实现方法。笔者通过生产检查实践,对地形图数字化测绘成果样本检查与内业数据检查的实施、检查项的选取、检查方法的选择和图幅扣分值调整系数的确定进行了探讨,供生产部门实施最终检查时参考。     

北京市1:2000比例尺地形图修测航测生产质量控制方法探讨

1：2000地形图是北京城市建设中需求较迫切的数据之一。本文对北京市1：2000地形图修测航测生产的质量控制方法进行探讨，对生产工艺流程中的质量检查点、检查要求和检查内容进行论述。对提高地形图数据产品质量，缩短地形图修测周期具有重要的作用，对其它城市大比例尺地形图修测质量控制方案的制定具有参考意义。     

CASS数据到GIS入库数据的转换方法探讨

主要探讨了CASS地形数据到GIS基础地理信息数据的转换方法,对地形图数据入库的步骤和内容进行了分析研究,提出了解决问题的具体技术方法,包括地形图数据整合处理、要素分类代码转换、图形要素质量检查等,并将该方法成功运用于鹤岗市1:1000数字化地形图数据入库生产项目,取得了良好的结果.     

1∶10000地形图及更新建库的检查方法探讨

数据检查是1∶10 000地形图及更新建库生产的质量保证,数据产品生产过程中需要许多作业步骤,每一步骤的质量检查都关系着数据产品成果的质量。本文通过具体作业详细讲述了1∶10 000地形图及更新建库生产的质量检查方法及过程。     

浅谈1：5万地形图缩编生产中的质量控制与技巧

本文根据1：5万地形图缩编生产的特点,针对1：5万地形图缩编生产及质量检查中发现的问题,做了一些分析和探讨,结合生产实践总结了一些解决质量问题的方法与技巧,对地形图生产的质量控制有一定的借鉴意义。     

基于检查算子地形图内业质量检查系统的实现

随着数字地形图产品内容和数据日益多样化,如何严格把控地形图产品的质量成为质检部门不断深入探讨的问题.本系统以内业质检为目标,设计与研发了地形图内业质量检查系统.该系统采用自动检查算子库与可定制化检查方案相结合的手段进行自动化检查,通过实际应用推广发现,利用该系统可大幅提高数字化地形图的质检效率及可靠性,在地形图质量检查方面具有较高的研究价值.     

福建省数字城市大比例尺DLG数据质量问题及检查方案研究

随着大比例尺DLG数据的广泛应用,其数据质量检查是控制数据质量的重要环节。本文针对以大比例尺地形图为数据源的DLG数据,从生产实际出发,结合其数据特点,针对现有的数据质量问题,从检查内容和检查方式上制订了数据检查方案,为数据质量检查工作给予一定的参考,提高数据质量检查的效率与准确度。     

数字地形图生产的质量控制与评价

总结了数字地形图的发展历程和数字地形图的生产过程,论述了数字地形图质量控制内容和质量检查的主要方法,提出了数字地形图质量评定标准并对数字地形图质量评定的方法进行了论述。     

ArcGIS中数字化地形图快速入库的方法与技巧

结合中山市火炬新城开发区地形图的入库工作,在数据转换、入库编辑和质量检查方面摸索出了一套行之有效的方法与技巧,从而在保证质量的前提下实现了ArcGIS中数字化地形图的快速入库。     

阿克苏河-塔里木河水系水质污染遥感监测与评价

 采用Landsat TM数据分析了阿克苏河—塔里木河断面水质污染状况,通过波段的DN值和常规监测数据建立能反映水质状况的 污染物监测模型。结果发现,将2000年常规监测数据代入模型后,与遥感数据的结果基本吻合| 重建阿克苏河—塔里木河的连续水体 污染变化曲线,得出污染物浓度随着远离上游而增加。     

Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data

The hard-rock hilly Aravalli terrain of Rajasthan province of India suffers with frequent drought due to poor and delayed monsoon, abnormally high summer-temperature and insufficient water resources. In the present study, detailed analysis of meteorological and hydrological data of the Aravalli region has been carried out for the years 1984–2003. Standardised Precipitation Index (SPI) has been used to quantify the precipitation deficit. Standardised Water-Level Index (SWI) has been developed to assess ground-water recharge-deficit. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been computed using NDVI values obtained from Global Vegetation Index (GVI) and thermal channel data of NOAA AVHRR satellite. Detailed analyses of spatial and temporal drought dynamics during monsoon and non-monsoon seasons have been carried out through drought index maps generated in Geographic Information Systems (GIS) environment. Analysis and interpretation of these maps reveal that negative SPI anomalies not always correspond to drought. In the Aravalli region, aquifer-stress shifts its position time to time, and in certain pockets it is more frequent. In comparison to hydrological stress, vegetative stress in the Aravalli region is found to be slower to begin but quicker to withdraw.     

Landslide risk analysis between Giri and Tons Rivers in Himachal Himalaya (India)

The area around Sataun in the Sirmur district of Himachal Pradesh, India (falling between the rivers Giri and Tons; both tributaries of the Yamuna River) was studied for landslide vulnerability on behalf of the inhabitants. The study was made using extensive remote sensing data (satellite and airborne). It is well supported by field evidence, demographic and infrastructural details and aided by Geographic Information System (GIS) based techniques. Field observations testify that slope, aspect, geology, tectonic planes, drainage, and land use all influence landslides in the region. These parameters were taken into consideration using the statistical approach of landslide hazard zonation. Using the census data of 1991, vulnerability of the populace to the landslide hazard was accessed. As most of the infrastructure in the region is concentrated around population centres, population data alone was used for vulnerability studies.     

Gravity Changes Before Large Earthquakes in China: 1998-2005

Although it is well known that coseismic gravity changes take place during an earthquake, previous research has not yielded convincing evidence demonstrating that significant gravity changes occur before large earthquakes. Furthermore, even if we suspect that gravity changes occur before large earthquakes, we have yet to demonstrate how to consistently observe these changes for useful earthquake forecast that would bring benefits to society. We analyzed ground gravity survey data obtained in 1998, 2000, 200...     

GNSS系统及其技术的发展研究

阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议.     

“4D”技术及其应用

介绍“４Ｄ”（即数字地面模型、数字正射影像、数字栅格地图和数字线划地图）系列产品的生产流程、关键技术、及其在耕地保护、防灾减灾救灾和城市规划等方面的应用方法。     

Virtual Australia: its key elements – know,think, communicate

Abstract

Virtual Australia is not a well-defined or agreed concept. This discussion paper conceptualises Virtual Australia as a ‘virtual [digital] model containing and representing all non-trivial objects and their contextual environment – from blue sky to bedrock – in real world Australia’. It describes a scenario for Virtual Australia, one or two decades from now, in which the locations and conditions of non-trivial objects and their environment are updated automatically through a combination of remote sensing and wireless communication technologies in support of a ‘Supranet’. It then examines the concept of the ‘Supranet’ – a pervasive information network based largely on wireless technology linking the physical world to a virtual model in real time – and develops and discusses three principal characteristics of the Supranet: the ability to have or collect specific information (know); the ability to process information (think); and the ability to communicate that information. If, in the near future, any or all non-trivial devices are to some extent able to know, think and communicate, the potential for object autonomy will be realised.     

Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services

Location-Based Services (LBS),an emerging new business based on smartphone and mobile networks,are becoming more and more popular.Most of these LBSs,however,only offer non-seamless indoor/outdoor applications and simple applications without giving stakeholders the chance to play an active role.Our specific aim is to solve these issues.This paper presents concepts to solve these issues by expanding the Open Location Services Interface Standard (OpenLS) to allow seamless indoor/outdoor positioning and to extend the content of the services to include information recommended by stakeholders.     

地理数据库的关系模型及其实现

本文从以图论观点分析地理实体入手,系统阐述了地理数据库关系模型的设计法和过程。作者于1984年4～9月间在微型机上设计建立了关系型地理数据库的实方验系统(RGDB)。该系统采用了本文提出的关系模型,采用了可动态扩库的子库组合结构,这种结构具有灵活性和提高空间利用率的优点。RGDB含有多种功能的数据操作命令,除了具有一般检索功能外,还能进行“开窗”选取和十分“自由”的映象选取。本文对RGDB系统的主要性能和实现途径作了扼要介绍。     

GIS空间数据的采集误差及其分析

本文详细阐述了GIS数据采集过程中的误差来源，重点分析了通过地图、遥感和摄影测量等方式采集数据所产生的误差及其特性，分析了其对GIS数据的影响与消减方法。