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The following topics are dealt with: spatial database; GIS; location information; cartography; data visualisation; urban and regional information system.
In the extension process of the Digital City, there are many geographic information application platforms using three-dimensional architectural models, but the aim is only to create three-dimensional view effects. The abundant data of models is not fully used. The purpose of this paper is to make a preliminary exploration on application models of the three-dimensional architectural model used in the...
Soil erosion is one of the major serious geo-environmental issues causing land degradation in China. Developing new remote sensing techniques to analyze the change of soil erosion will assist in the comprehensive treatment of environment and the sustainable management of soil resources. In this study we derived land cover and NDVI from TM 5 images, to assess the soil erosion with DEM. These techniques...
This paper analyzed the business application requirements of Three Gorges Reservoir area water environment risk assessment and early warning platform, referred to “Federal Enterprise Architecture”, based on the "SOA" and "modular" system architecture design, and then according to the needs of data resources “big focus”, established standard database exchange and procedure interactive...
This paper analyzes the problems of creating method of traditional spatial index in the digital map for car-navigation system and suggests a new kind of creating method of spatial index based on two-level interleaving grid. It analyzes the principle of this algorithm and discusses the retrieval and storage technology of road information. The experimental result indicates that the use of this method...
With the rapid development and wide application of information visualization technology and WebGIS technology, the virtual tour develop by using information technology has become a key technology of today's tourism industry. In particular, the emergence and development of Google Earth provides a new tool and platform for tourism resources development and application. This paper takes the navigation...
ArcGIS Engine can access HDF files with only one dataset, but can not access HDF files with multiple datasets. To Make ArcGIS Engine have the ability to access HDF files with multiple datasets, this article studies the data model of GDAL, and uses the API of GDAL to read HDF files into memory, then uses the programming interface of ArcGIS Engine to convert the data in memory to raster datasets that...
In this paper we present a novel approach which will update the disaster area by photos taken by normal camera in three-dimensional environment. Normal photos don't contain any spatial information so it is hard to update the photos to the right area directly. In this paper we utilize an alternative method to obtain the spatial information which will construct a viewing frustum by the position and...
The analysis of Land-use change trends and its driving forces is one of the hot issues of global change research, the core of research is how to forecast the tendency of land-use change reasonably and accurately. The dynamic land-use change is very complicated, the traditional GIS method can solve part of the spatial correlation problem well, but it is hard to simulate complex dynamics in spatial...
This paper presents a real-time three dimensional visualization system of the East China Sea, composed by an ocean model with volume rendering technology and a marine GIS system. In the system, the spatiotemporal marine data of East China Sea is retrieved from an ocean modeling called the Princeton Ocean Model (POM), which is a sigma coordinate, free surface ocean model with embedded turbulence and...
The construction of three-dimensional digital city is an important application area of GIS technology, and construction of large scale city 3D building scene based on 2D building outline is a method to construct three-dimensional digital scene. This article makes a study of using ArcSDE to store the Shape files in SQL Server database, and then uses ArcObject to program the ArcSDE in order to gain...
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,...
Digital watermarking is an effective technology for copyright protection, but the passive of traditional detection method limits the application of this technology for vector data in GIS. Mobile agent technology, which is a combination of artificial intelligence technology and network technology, has some obvious advantages that could solve this problem. This paper studies mobile agent technology,...
The need to mitigate the repercussions of urban sprawl over the last decades triggered the use of systematic urban plans that encompass land use, transportation and environmental dimensions. These plans aim at forecasting housing demand and analyzing the impacts governmental policy programs may have on urban development. A considerable number of integrated urban models have been developed and used...
Fusion of SAR image and multi-spectral (MS) image can provide complementary information about the ground observed objects. This paper presents an fusion method of SAR and multi-spectral images based on the IHS transformation and phase congruence feature extraction. The IHS transform is firstly made to MS image to separate the intensity from the hue and saturation components. Then the phase congruence...
Combining grid Geographic Information System (GIS) and mobile GIS, a new open spatial information grid service mechanism is discussed based on the analysis of the latest computer technology and GIS research. Focused on mobile devices' low capacity, narrow bandwidth and frequent disconnection characteristics, the Spatial Information Grid Service Model for Mobile Devices (also named as M-SIG) is put...
With the progress of the data collection technology, available multi source spatial data is growing rapidly. The common manners to access these data are limited by the complexity and the need to collect the data in a center location. Moreover, a variety of softwares adopts their own data formats which may not be understood by other systems, which makes the data sharing difficult. Therefore, an approach...
We describe a prototype system that can provide automated generation of low-level calibrated remote sensed imagery and user configurable on-demand product generation for higher processing levels. The system offers full reproducibility of user orders and processing requirements by employing a relational database and a cluster-based parallel processing system. Such structure allow users to subscribe...
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