共查询到20条相似文献，搜索用时 781 毫秒
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全国测绘行业职业技能竞赛工程测量赛项所规定的测绘成果形式与南方CASS地形绘图软件生产出的测绘成果存在一定差异。基于南方CASS地形绘图软件平台,通过AutoCAD内嵌lisp语言进行二次开发,即通过更改CASS环境和增加图层改色、图廓设置等功能,使参赛选手能在不改变传统绘图习惯的前提下,实现快速、准确修改指定地物的图层、颜色以及图廓要素等,高效地生产出满足竞赛要求的测绘成果。 相似文献
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为了直观揭示矿山井下竖井、天井贯通测量的作业方法和规律,采用某测绘仪器公司CASS7.1地形、地藉成图软件,摸索出一种全站仪结合CASS7.1地形、地藉成图软件进行矿山井下竖井、天井贯通测量试验的方法.并且通过在某矿山井下竖井、天井贯通测量工程的试验应用,进行理论上和实践上的试验,达到了预期精度效果,解决了全站仪结合CASS7.1地形、地藉成图软件进行井下竖井、天井贯通测量的方法问题. 相似文献
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选择目前黑龙江省内测绘单位常用的DJC 2000数字成图软件和CASS 7.0数字测图软件进行比较,分析了这两种软件在地形地籍、工程测量等成图性能上的一些差异并得出相应结论。为今后在不同测绘任务中使用两种软件提供了有利依据。 相似文献
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叶立 《测绘与空间地理信息》2014,(8):172-173
目前南方CASS在二期间土方计算中将二期地貌假设为理想地貌或设计地貌,对于较为复杂的二期地貌,则不能满足其土方计算的要求。结合南方CASS2008地形地籍测绘软件,进一步将其程序设计逻辑优化,并将优化重点进行详细阐述,以供南方CASS软件的二次开发及功能完善,从而降低土方计算的工作量,提高工作效率。 相似文献
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南方CASS测图软件是目前较流行的一款数字化测图软件,其科技含量高,功能强大,可大大减轻测绘人员的工作强度,提高作业效率和测绘精度。介绍一款基于南方CASS的二次开发程序,能有效提高数字化测图数据预处理的效率和准确性。 相似文献
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随着无人机与新型航拍技术的发展，无人机倾斜摄影技术在大范围地形数据采集过程中发挥了重要作用，三维测绘相关研究得到了极大的促进。而针对水利行业所需的水上地形与水下地形一体化生产过程的研究相对较少。本文布设统一控制点，采用固定翼无人机倾斜摄影测量技术进行水上地形测绘，应用RTK配合测深仪在船上进行水下河道三维地形数据采集，对于涉河建筑物采用BIM软件进行参数化建模。最后，针对水上地形数据，水下河道地形数据及建筑物三维模型进行融合处理，得到水上水下一体化三维河道场景，搭建Cesium平台进行三维展示。其研究成果可为水上水下一体化测绘与可视化提供技术帮助，有助于推进智慧水利的应用发展。 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