检索结果-南通市图书馆

Information extraction and dynamic evaluation of soil salinization with a remote sensing method in a typical county on the Huang-Huai-Hai Plain of China

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Pedosphere 2020年第4期30卷 496-507页

作者： Xiaoguang ZHANG Biao HUANG Feng LIU State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) College of Resource and Environment Qingdao Agricultural UniversityQingdao 266109(China)

Monitoring the dynamics of soil salinization is of great importance for agricultural *** study selected Yucheng County,a typical county on the Huang-Huai-Hai Plain(HHHP)of China,as the study area and evaluated the spatial and temporal variation of soil *** methods,consisting of principal component analysis(PCA)transformation,tasseled cap(TC)transformation,and optimal band combination(OBC),were used to extract information from an early Landsat multispectral scanner(MSS)image from 1984,and their advantages were *** addition,OBC was used on a thematic mapper(TM)image from *** iteratively self-organizing data analysis algorithm was used together with prior knowledge of likely classifications to interpret the MSS and TM images for data ***,a transfer matrix method was used to assess the spatial and temporal variability of soil salinization and analyze the driving factors of soil *** to PCA transformation and OBC,TC transformation was a more effective method for extracting soil salinization information from the MSS *** results indicate that a soil area of approximately 298 km^2was affected by salinity in 1984 in Yucheng County,of which 5.40%,11.96%,and 12.75%were classified as being subject to slight,moderate,and severe salinization,*** 2009,the saline area was reduced to only 146 km^2,of which 10.70%and 3.75%were characterized by slight to moderate salinization and no severe salinization,*** saline land decreased at an average rate of 6 km^2per *** decrease was probably a result of lower groundwater depth,increased organic fertilizer or crop straw in soil,changed land use type,and increased vegetation coverage.

关键词： Landsat multispectral scanner optimal band combination principal component analysis soil salinity tasseled cap thematic mapper

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Classification of the mining land cover based on density segmentation

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Journal of Measurement Science and Instrumentation 2012年第4期3卷 336-340页

作者：孙茜茜王萍 College of Geomatics Shandong University of Science and Technology

The Datun mining area is the test area in this paper,and the purpose is to obtain the mining land cover classification map in *** data source used in this paper is the Landsat enhanced thematic mapper plus(ETM)remote sensing *** obtaining the normalized difference vegetation index(NDVI)of the study area,the land cover classification information is extracted using the density segmentation *** the results cannot distinguish the construction land and wetland,this paper obtains the humidity information of multi-spectral data through the tasseled cap *** the density segmentation image of humidity information,the construction and wetland types can be clearly ***,combining the two classification maps,the visual interpretation using Landsat ETM fusion image with 15-m resolution helps to get the final classification *** classification accuracy assessment,the overall accuracy calculated from the classification confusion matrix is 86%.This result can be applied in actual project.

关键词： density segmentation processing of small polygons tasseled cap accuracy assessment

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