共查询到20条相似文献，搜索用时 500 毫秒
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在AutoCAD的二次开发方式中,简单介绍了如何利用.NET进行二次开发,最后基于AutoCAD提供的.NET类型的API,在管线CAD系统属性查询功能中实现了鼠标悬停显示信息的ToolTip效果。 相似文献
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AutoCAD提供了多种开发工具,如VBA、LISP、.NET API、ObjectARX等.自定义对象是ObjectARX中特有的功能,通过使用自定义对象功能,可以自定义类型来封装数据,从而取代传统的XDam、XRecord方法保存扩展数据,还可以使用该功能扩充Auto-CAD原有对象类型.同时,自定义对象还有一些特殊的保护功能.介绍ObjectARX的自定义对象功能及其特性,并结合实例介绍在Visual C++.NET 2005集成开发环境中使用ObjectARX 2008实现自定义对象功能的关键技术方法.最后列举ObjectARX自定义实体的几个应用. 相似文献
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主要阐述基于AutoCAD的扩展数据与VBA二次开发技术,将建筑图形数据与建筑属性数据结合起来,实现基于DWG图形的建筑物属性管理,并对属性信息进行一些简单的统计工作。 相似文献
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基于AutoCAD人机交互成图方式是目前地下管线探测数据处理的常用方法,而如何将以扩展属性存储复杂管线信息的CAD格式管线数据无损转换为GIS格式,并适应各种不同要求的数据标准以录入管线信息管理系统,是业内经常遇到的难题。本文基于FME软件的语义转换技术,结合实例研究将CAD格式地下管线数据无损转换为Shapefile文件的过程及要点,转换成果符合入库标准。语义转换技术使得转换过程更加灵活、高效。 相似文献
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CAD宗地数据向Geodatabase自动转换方法研究 总被引：1，自引：0，他引：1
目前,宗地数据主要以AutoCAD(*.dwg)格式为主,其属性数据多以文字注记或扩展数据(XData)的形式存储。随着宗地数据量的增加,数据文件的打开将变得缓慢,同时该数据组织方式几乎不具备任何查询能力。若以G IS数据格式存储则可以解决此类问题。以长沙市宗地数据为例,利用VBA对ArcG IS和AutoCAD进行二次开发,实现了CAD格式的宗地数据自动转换为Geo-database格式,同时,将宗地名称、编号等属性值自动存储到对应宗地要素的相应属性字段中。实践表明,该方法执行效率高,对类似数据格式转换有一定的参考价值。 相似文献
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王立伟 《测绘与空间地理信息》2022,45(1):186-188
AutoCAD具有强大的图形绘制功能,SHP作为ArcGIS平台最常用的数据格式,可以为几何的点、线、面数据赋予必要的字段属性信息。本文首先通过LISP语言对AutoCAD进行二次开发,实现对所绘制的几何数据追加扩展属性数据,再通过FME软件实现DWG数据到SHP数据的带属性转换,解决以往两种平台之间数据属性无法衔接的问题,提高了工作效率。 相似文献
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在ArcView GIS中使用AutoCAD数据 总被引：8，自引：0，他引：8
随着地理信息系统的发展，GIS软件中不同格式的数据相互转化和应用更加频繁。系统用AutoCAD等平台录入的数据需要用ArcView进行处理构建系统。但不同系统的数据转换之间常常会丢失信息，如将CAD数据经过转换添加到ArcView视图中时会遇到要素重新分类，属性不可编辑，注记信息丢失等问题。介绍解决这些问题的一些处理方法和策略。 相似文献
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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。 相似文献
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Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data 总被引：5，自引：0，他引：5
C. Bhuiyan R.P. Singh F.N. Kogan 《International Journal of Applied Earth Observation and Geoinformation》2006,8(4):289-302
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. 相似文献
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Piyoosh Rautela Ramesh Chandra Lakhera 《International Journal of Applied Earth Observation and Geoinformation》2000,2(3-4)
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. 相似文献
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ZHAN F. Benjamin 《地球空间信息科学学报》2011,(1)
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... 相似文献
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GNSS系统及其技术的发展研究 总被引：3，自引：1，他引：2
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. 相似文献
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“4D”技术及其应用 总被引：13，自引：0，他引：13
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。 相似文献
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《International Journal of Digital Earth》2013,6(1):66-87
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. 相似文献
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Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services
Kohei OGAWA Edward VERBREE Sisi ZLATANOVA Naohiko KOHTAKE Yoshiaki OHKAMI 《地球空间信息科学学报》2011,14(2):109-118
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. 相似文献
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地理数据库的关系模型及其实现 总被引：1，自引：0，他引：1
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。 相似文献