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Compared with the common line-simple algorithm, contour generalization pays more attention on the spatial relationship and coordination between the lines. Using the common D-P algorithm may cause intersection or self-intersection. Combined with the particularity of contours, this paper improves the Douglas-Peucker simplification algorithm from tolerance, curvature and the simplified method. The experiment...
This paper presents a method that apply shape context features to identify building from high remote sensing image automatically. This method use adaptive algorithm of key point detection to detect the key point of building boundary rapidly. By eliminating the unstable points, the stability of detected edge points can be improved. We apply the selected points for log-polar coordinate's transformation...
Geo-information Tupu has preponderance in disclosing the intrinsic law of “patterns and processes” of the geo-phenomena. This research focuses on the analysis of landscape change of the eco-environment in Fujian, China, based on the theory of Geo-information Tupu. At first, based on the analysis of interactions between basic environmental factors in Fujian province, it brings forward a basic cluster...
Recently, urban sprawl becomes common phenomenon overseas and in domestic. Urban sprawl is a discontinuous development pattern and impacts on environment, economic and social aspect, including landscape fragmentation, species decrease, bio-diversity decrease and habitat destruction. Many researches indicate the relationship indeed exists between transportation accessibility and urban sprawl. The raise...
Settlement matching is one of the important parts of large scale map update. All edges of settlements are classified based on their length and orientation so as to translate them into set of symbols at first. The representative patterns of settlements were thoroughly enumerated and their corresponding grammars are constructed based on common settlement types secondly. Thirdly, all settlements are...
The data collection and updating are all related to editing module in GIS, whether or not the editing module is good determine the system effect and the feeling of the user even the users' judgments. This passage mainly talks about how to describe the geo-entities via geometry model and how the geometry model and the geo-entities model cooperate with each other.
LIDAR (Light Detection and Ranging) is one of the most effective remote sensing systems, which could provide three dimensional information of earth surface with high accuracy and speed. Now the building boundary extraction is the key approach for 3D modeling of building and city mapping. In this paper, a new algorithm named Alpha Shapes is developed to extract the building boundary. Compared with...
The construction for thematic map symbol is a very complex and intelligent process. This symbol can be automatically generated and easily shared on the web through the syntactic characteristics of statistical indicators and cartography visualization. This paper expounds the symbol types, inner structure and its design pattern. And a syntactic construction theory based on phoneme (thematic map primitive)...
Because different types of ground objects have different spatial and spectrum characteristics, automatic and accurate extraction of different thematic objects from remote sensing without spatial conflict and topology conflict is still a challenge. The design of special thematic intelligent Agents to recognize special objects in high-resolution remote sensing images is useful for object extraction...
TSR (Traffic sign recognition) is an important research field in ITS (Intelligent traffic system), which is being paid more and more attention for realizing drivers assisting system and automated navigation etc. Author proposed a new method to detect traffic signs in outdoor scene. The method is divided into 2 step. Firstly, Two-way integration method including both methods drived by task and methods...
This study selected aquatic vegetation in BaiYangDian Wetland Nature Reserve in Hebei Province. Measuring the spectral reflectance of typical aquatic vegetation included stonewort, reed, lotus and typha, involved high-resolution GeoEye-1(GE) remote sensing image, based on spectral reflectance of different species simulating bands of GE, calculated the simulated bands, educed better bands or band combinations...
Currently, with many popular GIS software platforms occurring, interoperating data in different platforms has an important application value. Taking MIF data for an example, which is the Interchange Format of MapInfo, this article puts forward three ways of MIF data interoperability in ArcGIS platform through the analysis of data format of MIF, namely interoperated Quick Import tool for calling data,...
Developed using the Python object-oriented scripting language, Warn Notice Toolbox is an open-source package designed for the exploratory visualization of unemployment events recorded by the PDF files of warn-notices. The goal is the visual representation of large-scale collections of both non-numerical and numerical information in a GIS environment. This article presents an outline of the design...
LandsatETM+ RS images of Meicheng forest-farm of Dongzhi county in Anhui Province in 1999 and 2006 were used as the main data sources, along with the data of forest management inventory, etc. Based on the remote sensing images processed, the forest landscapes were classified and mapped by the method of unsupervised classification. The forest landscape indices were calculated in FRAGSTATS. The dynamic...
The study area includes four districts (Chengguan, Qilihe, Anning, and Xigu) of Lanzhou city, whose total area and population is 227.98 km2 and 1,800,000 respectively. In this study, we aim to resolve two questions: (1) from the spatial analysis, we want to know what changes have happened on urban landscape characteristics from 1976 to 2004? (2) What is the main driving force behind the changes? This...
Due to their limited expressive capabilities and computational resources, typical mobile devices are still not appropriate for real-time 3D navigation, in particular when widespread building models in the urban environments have a very detailed geometry. In order to better balance the capability of mobile devices and the perception demands of the users in 3D navigation, this paper proposes an automated...
The paper researches the land use investigation by using aerial photography which obtained by the high resolution CCD. It discusses the method to interpret land use in Liugou of Penglai and use the parallel relation between digital orthophoto(DOM) and features to analyze the condition of land use with with 3S technology to expression in detail. It will provide scientific and necessary references to...
Due to the vagueness of spatial direction relations and the limitation of current models, a fuzzy description model of direction relations based on adaptive sampling is presented. According to fuzzy theory, a new membership function is proposed as the reference model which is a basic fuzzy description model of 4 directions. And two objects are adaptively partitioned and sampled, thus the detailed...
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