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The progressive transmission of map data over World Wide Web provides the users with a self-adaptive strategy to access remote data. It not only speeds up the web transfer but also offers an efficient navigation guide in information acquisition. The key technology in this transmission is the efficient multiple representation of spatial data and pre-organization on server site. This paper aims at offering...
To prolong network lifetime and reduce average energy consumption when nodes are unable to measure the distance to neighbor nodes or have not distance measuring hardwire, distributed power control algorithms for wireless sensor networks are proposed. SPCA and PPCA are used to calculate the transmission power according to local information (residual energy). In the SPCA, the interval of residual energy...
Quality assessment of water body mapping products derived from Landsat TM/ETM+ imagery is necessary to improve the product's quality. Up to now, great efforts have been made to improve the accuracy of the water extract, and the main approaches used for assessing the accuracy of the water mapping are performed based on sampling. Usually, the quality information is represented by using some statistical...
Optimization of soil sampling network is a complex optimization problem, which must reconcile a series of conflicts such as survey budget, sampling efficiency and sampling barriers, etc.. High computational cost of this problem motivated the applications of parallel computation algorithms. Our study proposes a parallelized multi-objective particle swarm optimization model (PMOPSO), which combines...
Mapping and dating soil total nitrogen is of great importance in soil use and evaluation. In this study we examine the feasibility of soil nitrogen content by using hyperspectrally reflective remote sensing methodology. This technique was tested in Hengshan County, northern Shanxi Province of China. The soil reflectance properties of samples were measured in the laboratory by ASD field spectrometer...
With the rapid progress of economy, the land prices change quickly, thus demanding frequent update that is hard to accomplish in time. This paper addresses these problems by employing geographic information system (GIS) and spatial data mining (SDM) to dynamically grade and evaluate the prices of land parcels. In the paper, the author briefly introduced the integrated techniques between GIS and SDM,...
The paper think that construction land expansion result from the development of social economic and the growth of population in the overall land use planning, and contain quantity increased and spatial configuration optimal. Based on the analysis, this paper construct an optimal allocation statistical model with two sub-models, one is to forecast the quantity of construction land required; another...
A brief introduction to the integrated technology between geographic information system (GIS) and spatial data mining (SDM). Then a spatial data mining prototype system called visual geo-classify system (VGCS) use to classify spatial data based on Visual C++ 6.0 and MapObject2.0 is designed and developed, the system is used Bayesian network and decision tree as the basic data mining algorithms, and...
A spatial data mining prototype system called Visual Geo-Classify System (VGCS) use to classify spatial data based on VC++6.0 is designed and developed. The authors used examples of data verified the effectiveness on system performance, algorithms and rules. The results indicate that this prototype system is a practical and extensible Visual Interactive Spatial Data Mining tool, it can achieve the...
The research aims at establishing system of urban land grade and datum land prices in Hubei province of China. The balance of urban datum land prices is made to harmonize regional land prices among cities and to make datum land prices truly reflect different economic development levels. Principal component analysis enhances selection of evaluation factors and confirmation of weights. K-Means clustering...
Cartographic generalization is a cartography which selects, simplifies and generalizes objects in map according to the cartographic purpose, map scale and geographical features of the generalized area. This process creates a new map which should keep the basic geographical features of the generalized area. In map and GIS, the basic geographical features of an area are mainly reflected by spatial objects'...
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