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This thesis is based on the application of Internet of Things (IoT) and WebGIS in precision agriculture. Through analyzing the current development of precision agriculture in China and considering its advantages and shortcomings, we choose an ecology farm as an example to conduct a new precision agriculture management system (PAMS) based on the above two techniques. We designed the four architectures...
The paper reviews virtual environment and GIS technologies available and suitable for virtual city development and urban planning, and focus on the form of 3D virtual city for representing realistic urban environment. The several fields are discussed in terms of their applicability to Web-based applications relating to the urban environment, interactive mapping and collaborative modelling, solid,...
Large gap of supply and demand for mineral resources brings an urgent need to develop technology and methods for mineral exploration. Metallogenic prediction plays a leading role in mineral exploration. In consideration of current software platform we used and characteristics of specific metallogenic prediction method, the efficiency and quality of metallogenic prediction are not so satisfactory....
Nowadays, high performance parallel computation is deemed as a good solution to the complicated processing of massive spatial data. It is a very important precondition to make the most of this technology that data be partitioned. In this paper, we talk about the general strategy of spatial data partition and summarize its principles are good space proximity, balanced data load, small data redundancy...
Geospatial data is the core of spatial information system. It is always a research hotspot of how to realize the sharing and integration applications of distributed geospatial data. OGC has developed a number of web services specifications that enable the interoperation of heterogeneous geospatial data sources. Grid is the technology enabling resource sharing and coordinated problem solving in dynamic,...
A new methodology of mobile police spatial information service grid model is studied based on spatial grid computing environment. Key technologies are presented in the model, including spatial grid computing, mobile agent (MA) distributed computing, mobile geographic information system (GIS), global positioning system (GPS), video monitoring, transfer control protocol/internet protocol (TCP/IP), and...
Energy shortage brings the challenge of "high-efficiency, high-quality" to evaluation of mineral resources. Subject to conditions, general softwares for evaluation of mineral resources are mainly used in the stand-alone environment, while geological spatial data are often cross-regional, cross-platform and stored distributed. With the rapid development of grid computing, various distributed...
Online virtual world such as second life becomes more and more popular nowadays. And way-finding in large-scale virtual worlds becomes important problem for both novices and experts. Similar to the physical world, a well-designed mapping system would play an important role in way-finding process. However, Second Life only supports thumbnail map system right now. The thumbnail map system could only...
DGIP (Distributed Geographic Information Processing) has become a new tendency of GIS (Geographic Information System) recently. DGIP focuses on how to organize and process a series of geographic resources in distributed computing environment and now existing research is mainly carried out from a global point of view. But it is noticeable that each computing node in distributed computing environment...
The Barn project, a spatial data grid prototype under development currently, provides a grid environment for applications of the nationwide geological survey data. Within Barn, in order to reduce data access latency, avoid a single point of failure, and increase the performance and load-balance of the system, we have designed and implemented a set of replica management services. These services, based...
The Barn project, a spatial data grid prototype under development currently, provides a grid environment for applications of the nationwide geological survey data. In order to save and manage raster data in the grid environment, we should take many factors into account, such as massive data, multisource, index rebuilding, pyramid re-creating and etc. All these factors influence the logical and physical...
Spatial Data Grid allows for solving larger problems and executing applications that traditional Web GIS (Geographic Information System) can not handle efficiently. The purpose of this paper is to design and implement a new mechanism to organize miscellaneous Vector Map Services, built on GT 4 (Globus Toolkit 4), and based on WSRF (Web Services Resource Framework). In this paper, we illustrate the...
Spatial data grid allows for solving larger problems and executing applications that traditional Web GIS (Geographic Information System) can not handle efficiently. In spatial data grid, all functions of GIS are encapsulated as stateful Web services. The purpose of this paper is to design and implement a new mechanism to organize miscellaneous vector map services, built on GT4 (Globus Toolkit 4),...
The Barn project, a geospatial data grid prototype, provides a grid environment for applications of the nationwide geological survey data. Barn is developed based on the Globus Toolkit. Through Web portal, users can manage the grid resources, perform browsing, querying and analysis against the spatial data. According geospatial application nodes are organized into application domains. The node management...
Rapid evolutions in Earth Information, network, visualization and virtual world technologies create opportunities for a new era of information systems and Internet applications. These technologies' advances enable new capabilities for creation of dynamic contents, visualization of multiple and higher dimensions, distributed collaboration and cognition, immersive participant and interaction, and high...
The integration of services in heterogeneous, distributed grid environment is dynamic and diverse because of the disparate resources. Hence, this integration can be technically challenged due to the need of achieving various service when running on different platforms. So, in a grid environment, implementations of GIS (geographic information system) should not only concern their internal spatial characteristics,...
The gradient variance and spatial stability associated with landscape pattern were investigated for fast urbanization area of Tongzhou District of Beijing by combining spatial network sampling technique, landscape metrics and gradient analysis. A newly integrated indicator, Landscape Stability Index (LSI) is established by combing related landscape metrics to reflect the potential landscape dynamics...
Recently, there has been a fast proliferation of applications creating geospatial data distributed somewhere that has to be processed, queried and analyzed efficiently. Consequently, there is a need for effective data processing technologies that are able to support such distributed query and analysis operations. The emergence of grid computing offers a well solution to accomplish this goal. Development...
It is currently one of the hottest research areas of geospatial informatics to integrate OGC specifications with Globus-based Grid technology to develop geospatial Grid. In Grid systems, the security of resources outsourced from multiple organizations is very critical. However, the authorization mechanisms provided in the Globus Toolkit cannot realize the fine-grained and geospatial access control...
The research on the sharing and interoperation of geospatial information is always a hotspot in GIS field. Many methods have been proposed such as data format transform, data direct access, Web GIS and data interoperation. These technologies have made great progresses in the sharing and interoperability of geospatial information. But there are many unconquerable problems such as the process of the...
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