全文获取类型
收费全文 | 323篇 |
免费 | 18篇 |
国内免费 | 22篇 |
专业分类
测绘学 | 94篇 |
大气科学 | 48篇 |
地球物理 | 82篇 |
地质学 | 27篇 |
海洋学 | 58篇 |
天文学 | 7篇 |
综合类 | 26篇 |
自然地理 | 21篇 |
出版年
2023年 | 2篇 |
2022年 | 9篇 |
2021年 | 10篇 |
2020年 | 14篇 |
2019年 | 17篇 |
2018年 | 5篇 |
2017年 | 16篇 |
2016年 | 14篇 |
2015年 | 6篇 |
2014年 | 14篇 |
2013年 | 29篇 |
2012年 | 17篇 |
2011年 | 15篇 |
2010年 | 21篇 |
2009年 | 16篇 |
2008年 | 19篇 |
2007年 | 26篇 |
2006年 | 22篇 |
2005年 | 14篇 |
2004年 | 11篇 |
2003年 | 17篇 |
2002年 | 10篇 |
2001年 | 3篇 |
2000年 | 12篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1990年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有363条查询结果,搜索用时 140 毫秒
11.
Aleksandar Milosavljević Dejan Rančić Aleksandar Dimitrijević Bratislav Predić Vladan Mihajlović 《International journal of geographical information science》2016,30(10):2089-2107
This paper discusses the integration of three-dimensional (3D) geographic information systems (GIS) and video surveillance systems using augmented reality (AR) techniques. The motivation for this integration is to overcome problems faced by conventional video surveillance systems. Explicit information concerning which camera currently monitors what area in such systems is missing; therefore, insight into the situation depends heavily on the operator’s training and experience. To ensure the complete coordination and monitoring of a situation in a system with multiple cameras, it is necessary to introduce a single reference system. GIS arises as a natural solution because it not only provides a solid ground truth but also provides semantic information that can be highly important in certain video surveillance applications. To integrate information into a GIS application, that information must be georeferenced. Based on our previous research regarding the addition of georeferencing information to surveillance video, this paper introduces models that can be applied to help integrate video and GIS. With an analogy to Milgram’s continuum between the real world and virtual reality, and analogous to the augmented reality and augmented virtuality in Milgram’s continuum, two models of integration are defined here: GIS-augmented video and video-augmented GIS. Then, we define the architecture of GIS-based video surveillance based on these proposed integration models, and finally, a prototype is implemented. The implemented prototype serves as a basis for analysing possible applications of real-world systems based on the integration of GIS and video. 相似文献
12.
Andrew Curtis Jayakrishnan Ajayakumar Eric Jefferis Susanne Mitchell 《International journal of geographical information science》2019,33(6):1224-1250
ABSTRACTThe importance of including a contextual underpinning to the spatial analysis of social data is gaining traction in the spatial science community. The challenge, though, is how to capture these data in a rigorous manner that is translational. One method that has shown promise in achieving this aim is the spatial video geonarrative (SVG), and in this paper we pose questions that advance the science of geonarratives through a case study of criminal ex-offenders. Eleven ex-offenders provided sketch maps and SVGs identifying high-crime areas of their community. Wordmapper software was used to map and classify the SVG content; its spatial filter extension was used for hot spot mapping with statistical significance tested using Monte Carlo simulations. Then, each subject’s sketch map and SVG were compared. Results reveal that SVGs consistently produce finer spatial-scale data and more locations of relevance than the sketch maps. SVGs also provide explanation of spatial-temporal processes and causal mechanisms linked to specific places, which are not evident in the sketch maps. SVG can be a rigorous translational method for collecting data on the geographic context of many phenomena. Therefore, this paper makes an important advance in understanding how environmentally immersive methods contribute to the understanding of geographic context. 相似文献
13.
14.
This article introduces a software package named GeoSurveillance that combines spatial statistical techniques and GIS routines to perform tests for the detection and monitoring of spatial
clustering. GeoSurveillance provides both retrospective and prospective tests. While retrospective tests are applied to spatial data collected for a
particular point in time, prospective tests attempt to incorporate the dynamic nature of spatial patterns via analyzing time-series
data to detect emergent clusters as quickly as possible. This article will outline the structure of GeoSurveillance as well as describe the statistical cluster detection methods implemented in the software. It concludes with an illustration
of the use of the software to analyze the spatial pattern of low birth weights in Los Angeles County, California.
相似文献
15.
IP网络技术的现状及其多媒体应用研究 总被引:1,自引:0,他引:1
介绍了IP网络的现状、实现方式以及发展趋势,并分析了基于IP网络的多媒体通信若干技术和应用。 相似文献
16.
17.
18.
PANHeping ZHANGChunsen 《地球空间信息科学学报》2003,6(2):48-54
This paper describes the structure,geometric model and geo-metric calibration of Photogrammetron I-the first type of photogrammetron which is designed to be a coherent stereo photogrammetric system in which two cameras are mounted on a physical base but driven by an intelligent agent architecture.The system calibration is divided into two parts:the in-lab calibration determines the fixed parameters in advance of system operation,and the insitu calibration keeps tracking the free parameters in real-time during the system operation.In a video surveillance set-up, prepared control points are tracked in stereo image sequences,so that the free parameters of the system can be continuously updated through iterative bundle adjustment and kalman filtering. 相似文献
19.
分析了利用GIS实现设备远程监视的技术优势和关键技术,提出了基于GIS的远程设备监视技术方案,设计并实现了一个基于GIS的远程设备监视实例。 相似文献
20.
面向多种网络带宽环境的远程教学视频传输技术研究 总被引:1,自引:0,他引:1
龚自康 《武汉大学学报(信息科学版)》2006,31(4):368-371
面向网络教育教学视频传输的需求,对视频传输所涉及的视频编码、网络带宽自适应等一些关键技术进行了研究。 相似文献