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    題名: 以基因演算法優化最小二乘支持向量機提升大地起伏估計精度
    Using genetic algorithm based least squares support vector machine to improve the undulation estimation accuracy
    作者: 陳佳欣
    Chen, Chia-Hsin
    貢獻者: 林老生
    Lin, Lao-Sheng
    陳佳欣
    Chen, Chia-Hsin
    關鍵詞: 大地起伏
    最小二乘支持向量機
    基因演算法
    正高
    橢球高
    Global Undulation
    Least Squares Support Vector Machine (LSSVM)
    Genetic Algorithm (GA)
    Orthometric height
    Ellipsoidal height
    日期: 2019
    上傳時間: 2019-10-03 17:20:08 (UTC+8)
    摘要: 工程應用上常使用之正高常以逐差水準測量獲得，然其所需成本較高;而由GPS水準測量獲得之正高具有所需成本低之特性。為提升GPS水準測量精度，求得滿足一定精度的大地起伏模型為當前主要研究課題。
    本研究使用最小二乘支持向量機(Least Squares Support Vector Machine)擬合區域的大地起伏，並使用基因演算法(Genetic Algorithm)，藉著其能快速求得全局最優(global optimization)之特性，對最小二乘支持向量機之參數進行搜索並優化，以提升大地起伏估計之精度。
    本研究分別以台南市、台灣中部以及台灣為實驗區，利用區域內同時擁有正高、橢球高及點位平面坐標之一等水準點資料，以基因演算法優化之最小二乘支持向量機擬合大地起伏值。實驗成果顯示: (1)台南市、台灣中部以及台灣實驗區經基因演算法優化後之最小二乘支持向量機(LSSVM(GA))於大地起伏擬合精度較未優化前，分別提升19.13%(由0.0298m降至0.0241m)、42.83%(由0.0523m降至0.0299m)以及1.86%(由0.0431m降至0.0423m); (2)與相關研究比較後，成果顯示LSSVM(GA)於建立三實驗區之大地起伏模型上，精度均優於倒傳遞神經網路(Back Propagation Artificial Neural Network, BPANN)方法。
    The orthometric height often used in engineering application can be derived by leveling, which costs a lot. Whereas the orthometric height derived by GPS leveling has the advantage of lower cost. And within the process of improving the accuracy of GPS levelling, obtaining the undulation model that satisfies the required accuracy is the main study goal.
    In this paper, Least Square Support Vector Machine(LSSVM) will be used to estimate the undulation model. And the Genetic Algorithm (GA), which has the capability of global optimization, will be used to search and optimize the parameters of LSSVM to improve the accuracy of the undulation model.
    Tainan, central part of Taiwan and Taiwan are chosen as the test area in this paper. For the test data, 2,067 benchmark points distributed throughout the Taiwan region with the orthometric height, the ellipsoidal height and plane coordinates of the points at the same time, were used. According to the test results, the conclusions are obtained as follows: (1) undulation are improved after using genetic algorithm based least squares support machine (LSSVM(GA)) with 19.13 % improvement in Tainan (reduced from 0.0298m to 0.0241m), 42.83 % improvement at central part of Taiwan (reduced from 0.0523m to 0.0299m) and 1.86% improvement in Taiwan (reduced from 0.0431m to 0.0423m). (2) after comparing with other studies, the results show that LSSVM(GA) is superior to Back Propagation Artificial Neural Network (BPANN) in establishing the undulation model of the three test area.
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    三、網頁參考
    LSSVMlab v1.8，Math Works，取用日期2019年7月，https://www.esat.kuleuven.be/sista/lssvmlab/
    描述: 碩士
    國立政治大學
    地政學系
    106257032
    資料來源: http://thesis.lib.nccu.edu.tw/record/#G0106257032
    資料類型: thesis
    DOI: 10.6814/NCCU201901190
    顯示於類別:[地政學系] 學位論文

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