發(fā)布時間：2018-10-19 09:58

【摘要】：傳統(tǒng)的土地利用調(diào)查方法更新周期長、工作量大、效率低且成本較高,遙感影像分類技術(shù)能夠快速、準(zhǔn)確地分析土地利用情況,掌握真實的土地基礎(chǔ)數(shù)據(jù),在土地利用調(diào)查中具有廣泛的應(yīng)用前景和巨大的應(yīng)用價值。而傳統(tǒng)基于像元的分類方法完全依靠地物的光譜信息,忽略了高分辨率影像中豐富的空間信息導(dǎo)致分類結(jié)果會受到異物同譜現(xiàn)象和椒鹽噪聲的干擾。針對這一問題,本文將面向?qū)ο蠓诸惙椒ㄒ�入到土地調(diào)查中,這種方法很好的克服了傳統(tǒng)分類法的弊端,且其分類結(jié)果可直接以矢量多邊形的形式輸出,能夠直接導(dǎo)入到GIS環(huán)境下進(jìn)行編輯處理與應(yīng)用分析。本文以2010年的IKONOS高分辨率遙感影像作為數(shù)據(jù)源,以東北大學(xué)及附近區(qū)域作為實驗區(qū),針對面向?qū)ο蠓诸惙椒ㄟM(jìn)行了大量的實驗,重點從以下幾個方面做了分析和研究：1)在分割過程中加入紋理濾波和邊緣檢測層,并通過多次試驗得到最優(yōu)分割參數(shù)。實驗對比各類地物在不同尺度下的RMAS值,確定出每一類地物對應(yīng)的最佳尺度,結(jié)合層次間的拓?fù)潢P(guān)系,最終建立一個由50、70和90三個尺度層組成的網(wǎng)絡(luò)結(jié)構(gòu)。2)根據(jù)國家現(xiàn)行土地分類標(biāo)準(zhǔn),結(jié)合影像目視解譯和實地調(diào)查確定研究區(qū)包含的類別。分析研究描述地物類別的最佳特征或特征組合,建立分類規(guī)則樹,并將面向?qū)ο蠓ǚ诸惤Y(jié)果與傳統(tǒng)基于像元法分類結(jié)果進(jìn)行對比。在面向?qū)ο蠓诸惖玫降氖噶拷Y(jié)果圖上對應(yīng)實地選取地物樣本,分別對地物樣本的長、寬及面積進(jìn)行量測與計算。3)采用面向?qū)ο蠹夹g(shù)對兩期Landsat-7影像進(jìn)行分類,基于分類結(jié)果構(gòu)建變化檢測規(guī)則,提取地物類別的變化圖斑,并對變化圖斑的面積進(jìn)行統(tǒng)計分析。實驗結(jié)果表明,面向?qū)ο蠓诸惙椒ǖ目傮w分類精度為90.68%,比傳統(tǒng)基于像元的最大似然法總體精度提高了18.98%,將其應(yīng)用到土地利用調(diào)查中,實現(xiàn)了土地利用分類過程的自動化。但由于面向?qū)ο蠓诸惙ǖ玫降氖噶繉ο筮吔缍喑尸F(xiàn)鋸齒狀,圖上量測的部分結(jié)果并非其直線距離,致使與實地同名地物間存在一定的誤差,故需要對其邊界進(jìn)行平滑處理后方能入庫。此外,將面向?qū)ο蠓诸惣夹g(shù)與變化檢測相結(jié)合的方法,能夠快速、準(zhǔn)確的檢測出土地的變化信息,為及時完善和更新土地利用數(shù)據(jù)庫提供了先進(jìn)的技術(shù)手段。
[Abstract]:Traditional land use survey methods have long updating period, large workload, low efficiency and high cost. Remote sensing image classification technology can analyze the land use situation quickly and accurately, and master the real land basic data. It has wide application prospect and great application value in land use survey. However, the traditional pixel based classification method completely depends on the spectral information of the ground object, and neglects the abundant spatial information in the high-resolution image, which results in the interference of the classification results from the phenomenon of foreign body isospectrum and the salt and pepper noise. In order to solve this problem, this paper introduces the object-oriented classification method into the land survey. This method overcomes the disadvantages of the traditional classification method, and the classification results can be directly output in the form of vector polygons. Can be directly imported into the GIS environment for editing processing and application analysis. In this paper, the IKONOS high-resolution remote sensing image in 2010 is used as the data source, and the Northeast University and its adjacent areas are used as the experimental areas. A large number of experiments have been carried out on the object-oriented classification method. The following aspects are analyzed and studied: 1) texture filtering and edge detection layer are added in the segmentation process and the optimal segmentation parameters are obtained through several experiments. By comparing the RMAS values of all kinds of ground objects at different scales, the optimal scale of each kind of ground objects is determined, and the topological relationship between layers is combined. Finally, a network structure consisting of three scales of 50, 70 and 90 is established. 2) according to the current national land classification standards, combined with image visual interpretation and field investigation, the types of the study area are determined. In this paper, the best feature or combination of features to describe ground objects is analyzed, and the classification rule tree is established, and the results of object-oriented classification are compared with the traditional classification results based on pixel method. In the vector result map of object oriented classification, the object samples are selected in the field, and the length, width and area of the object samples are measured and calculated respectively. 3) the object oriented technology is used to classify the two Landsat-7 images. Based on the classification results, the change detection rules are constructed, and the change patterns of the ground objects are extracted, and the area of the change patterns is analyzed statistically. The experimental results show that the overall classification accuracy of the object-oriented classification method is 90.68, which is 18.98 higher than that of the traditional maximum likelihood method based on pixel. It is applied to the land use survey to realize the automation of the land use classification process. However, the boundary of vector objects obtained by object-oriented classification is serrated, and some of the measured results on the map are not linear distance, which leads to some errors between the vector objects and the objects of the same name in the field. Therefore, it is necessary to smooth the boundary before it can be stored. In addition, the combination of object-oriented classification technology and change detection can quickly and accurately detect the land change information, and provide an advanced technical means for the timely improvement and updating of land use database.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P237

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