| The study intercepted4km2range of Dujiangyan city as research area, based on aerial image data by Erdas. With the support of Definiens software, the study extracted the land use information, through multi-scale image segmentation, the corresponding fuzzy classification rules establishing the study area of object-oriented rapid land classificatfon and through different classification methods obtained results were evaluated and compared the accuracy by ENVI; Combining with landscape theory, using a variety of landscape indicators to extract land use classification figure for analysis and discussion, according to the study the structure and pattern of land status quo corresponding optimization suggestions and measures to make some technical support as land use planning, land use dynamic monitoring updates and access to remote sensing thematic information to provide a certain amount of technical support. The study results are as follows:(l)Combining with the object-oriented analysis method could improve the interpretation precision of remote sensing images. In segmentation scale for200cases, selected segmentation parameters of shape factor of0.1, color factor of0.9,0.5firmness, smoothness0.5and combined with the corresponding fuzzy classificattion rule set to classify land use type in the study area, the overall accuracy of classification result was89.62%, the Kappa coefficient was87.31%, compared with the unsupervised classification result, overall accuracy increased5.65%, the Kappa coefficient increased0.0793, interpretation accuracy has increased significantly, with the traditional visual interpreting results tend to close;(2)The Object-oriented analysis method can quickly obtain the number of land-use and spatial structure. Study area land use structure:productive land, living space and ecological land were1.67km2,1.18km2,1.158km2, respectively, accounting for41.75%,29.50%and28.75%of the total area. Productive land only cultivated land one kind living land with roads, accounting for67.80%of the land area of life, accounting for20.00%of the total area, followed by the rural residential land, accounting for32.20%land area of life, accounting for9.50%of the total area; ecological land to woodland, accounting for ecological land area of82.61%,23.75%of the total area, followed by the waters, accounting for17.39%land area of life, accounting for5.00%of the total area; simultaneously through interpret the resulting classification figures for rapid analysis of land use structure could be obtained per square kilometer per unit area consisting of:0.42km2of productive land, living land0.29km2, ecological land0.29km2, and its corresponding. The fragmentation were:living land1805.93,286.23productive land and ecological land923.17;(3)The landscape pattern can be quickly extracted though the extraction of RS image feature. It is a way to obtain the main features of the ecological pattern. Research results show that the landscape pattern:Three types of land use landscape pattern has a certain regularity, and its pattern of state mainly control anthropogenic factors. Higher degree of polymerization of productive land and the shape is more regular, there are a lot of advantages plaques, plaque index values as high as10.3843, overwhelmingly affected the composition of landscape pattera In life land, rural residential land scattered distribution, mainly along roads, rivers distribution, the degree of polymerization was54.3302, which was the lowest of all land types; road site edge density index was233.1056, indicating it has better connectivity; woodland fractal dimension index up to L5240in ecological land, explained the relatively high degree of houndary folds, the shape was more tortuous and complicated;(4)The regional landscape ecological pattern can be changed by making the land distribution pattern reasonable. Based on the study area, the present situation of land use pattern optimization suggestions, as follows:①Life land to increase aggregation, establishmented a "Village-yard-village-house" system and the corresponding infrastructure, on the case of without major changes to existing the layout, to improve the quality of life and convenience;②productive land in order to enhance efficient use of land-based, land consolidation and the introduction of more mechanized operations, supplemented by field integration to promote the establishment of supporting infrastructure, eliminating the inherent nature of land affected to increase the scale of production and output;③places protected area ecological land forest, water and other basic ecological land use, narrowing in the process of land use impacts on the environment, the protection of the ecological environment built on the basis of appropriate land use landscape pattern. |
PDF Full Text Request