Font Size: a A A

Remote Sensing Monitoring Land Use Change Information Automatically Extracted And Empirical Study

Posted on:2008-12-23Degree:MasterType:Thesis
Country:ChinaCandidate:R G WangFull Text:PDF
GTID:2143360218953710Subject:Agricultural Remote Sensing and Land Use
Abstract/Summary:PDF Full Text Request
Application of remote sensing technology for land use monitoring in our country has beennearly 20 years. There are two purposes for dynamic monitoring: First, using remote sensingimages to monitor land-use changes; another is using monitoring data to analyze the factorsaffecting the process of land-use changes and trends, to guide government's management andpolicy. In addition, dynamic monitoring reflects the dynamic changes process of region land use,and the temporal characteristic of the monitoring data is obvious. With the development of ourcountry, the changes of land use are greatly, the periods of dynamic monitor get shorter and shorter.Therefore, we need extract information, which is unified managed and queried in GIS, in a rapidand effective way.For traditional methods of land use dynamic monitoring, the extraction of changedinformation mainly depends on visual interpretation and computer synchronization. This methodtakes a lot of time and energy, moreover it relies on the knoeledge and experience of the personwho participate in the visual interpretation. Generally the operation does not need duplication.Although many people have studied the methods of extracting remote sensing changed informationautomatically, most methods focus on the application which is suitable for different fields, and fewconcerned with the degree of realization and the convenience of operation as well as the classifyinterpretion of changed information.My paper is on the base of the development domestically and abroad, viewing of the land usedynamic monitor characteristic.At the same time, my paper has a systerms elaboration about thetheory and method of remote sensing images fusion. I use ERDAS,ArcGIS,MAPGIS to completethe images enhancement and changed information extraction.For the commonly images fusionmethods such as IHS transformation fusion method,BROVEY transformation,the conmbinedfusion of wavelet and IHS transformation,PCA change fusion and the combined fusion betweenPCA and IHS, I carry on experimental comparative analysis and effects appraise, and establishseven images fusion quality evaluation indicators about the information entropy, the averagegradient,variance and so on,as well as evaluate the effection of fusion images. At last by the fusionimage performance index, I come to the conclusion that the fusion method of IHS transformation isbest for dealing with land use dynamic monitor data fusion. The next is PCA+IHS transformationfusion method.On the base of fusion method research, I has further studied the method of changed information extraction, and did comparative experiment on D-value method,radio method, PCA,spectral characteristic variation. Through the experimental comparative analysis, I come to aconclusion that we can improve the information extraction efficiently, reduce the chance of wrongand missing information when use D-value method to extract changed information as well as usespectral characteristic variation to modify image changed information. On the base of the theorystudied above,I selected a city as experimental area, done empirical study by SPOT5 Imagesdata, And I establish the practice application frame system in the foundation of remote sensing landuse dynamic monitor, also realize remote sensing land use dynamic monitoring changedinformation extraction automatically.At last, I acheive the goal that the practice application issimplified, the application is practical, reducing the work intensity, enhancing the workingefficiency. I offer a technical project to make the land use dynamic remote sensing monitor fast andaccurate more and more, so my paper does have practical application value.
Keywords/Search Tags:Land use dynamic monitoring, changing information, image fusion, Information extraction
PDF Full Text Request
Related items