共查询到20条相似文献,搜索用时 875 毫秒
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论述卫星遥感影像的特点和用途,并以SPOT 5影像为例,探讨如何获取和利用不同时相的卫星遥感影像,通过内业判读,结合外业核查获得土地利用变化信息,进行土地的动态监测.介绍如何通过采取人机交互的方式进行判读、图斑采集、编制图斑统计表和制作影像挂图,论述遥感与GIS数据技术在土地利用动态监测中的综合应用. 相似文献
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遥感影像变化图斑智能化提取是自然资源动态监测工作的基础。本文简述了遥感影像变化检测技术演进历程及特点,提出同时使用ResNet、U-Net和孪生神经网络3种深度学习算法,设计了集“影像预处理、智能提取、协同筛查”于一体的遥感影像变化图斑智能化提取平台,并详细阐述了各功能模块设计思路。实践表明,融合3种深度学习算法有利于解决单一深度学习网络模型改造难度较大、适用范围有限等难题,有效提升了遥感影像变化检测的查全率,工作效率比目视解译提升超过3倍。研究成果已在湖南省自然资源“1+N”卫星监测工作中广泛应用。 相似文献
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随着上海市的经济发展,市区土地覆盖现状发生较大变化,产生了违法违规用地、非法侵占基本农田等问题。本文通过研究DSM(数字表面模型)的数据价值和高效处理方法,结合遥感影像、行业专题数据等多种资源,针对上海市土地覆盖变化的实际需求,运用GPU等新技术,实现DSM实时差分和快速矢量化的相关算法,并对疑似违法图斑进行了快速甄别,为上海开展地理市情监测和智慧城市建设提供了有力的技术支撑。 相似文献
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遥感技术提取水面信息是目前高效的方法,文中通过梳理现有水面提取方法,对关键技术进行分析,提出依据应用需求可采用基于中低空间分辨率、高时间分辨率遥感影像的大区域水面信息提取,以及基于长时间序列遥感影像的水面空间分布变化监测等不同监测模式的思路。通过选取实验区,开展水面范围变化动态监测,对提出的思路进行验证,为水面范围变化动态监测提供方法参考。 相似文献
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针对传统遥感影像变化检测方法对前后期影像数据质量要求高、适应范围窄、检测精度较低等问题,本文在引入异常点检测思想的基础上,提出了一种结合均值漂移分割与聚类分析的遥感影像变化检测方法。首先将前期地理国情矢量数据与待监测的遥感影像进行地理配准;然后在地理国情矢量数据的基础上对遥感影像作均值漂移算法二次细分割,获得的矢量图斑继承了原有父级类属性,并对同一父级类的影像图斑进行光谱、空间、纹理、指数等特征提取;最后采用高斯混合模型与最大期望值算法聚类获得多个类别,在父级类下找出异常类别的图斑。通过试验对比分析,表明了本文方法的有效性和可靠性,为遥感影像变化检测提供了新思路。 相似文献
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讨论了利用遥感影像光谱、纹理等多种特征信息的多核函数组合方式,给出了多特征空间差分核函数的构建方法,设计了多特征差分核支持向量机变化检测算法,该算法能够实现联合类别样本加权和遥感影像多种变化类别信息的直接检测。实验结果表明,该算法综合利用多种特征信息,检测精度明显高于传统方法,有利于提取小样本的变化信息,避免了以往检测方法需要确定变化阈值的复杂性和不确定性。 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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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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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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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