Please use this identifier to cite or link to this item: https://ah.nccu.edu.tw/handle/140.119/137045


Title: ICESat-2於台灣本島地形高程之特性分析
Characteristic Analysis of ICESat-2 Land Elevation in Taiwan
Authors: 林美佑
Lin, Mei-Yu
Contributors: 林士淵
Lin, Shih-Yuan
林美佑
Lin, Mei-Yu
Keywords: ICESat-2
ATL08
衛星測高技術
高程誤差特性
ICESat-2
ATL08
Satellite Altimetry
Characteristics of Difference of Elevation
Date: 2021
Issue Date: 2021-09-02 17:36:08 (UTC+8)
Abstract: 數值地形模型(Digital Elevation Model, DEM)為表達自然地形高程資訊的地理資料,應用層面相當廣泛,產製方式如水準測量、衛星定位系統、航空攝影測量、光達測量,然其皆須前往現地量測並僅適用於中小範圍之測量,對於縣市級、國家級甚至全球性之大範圍測量較不符效益。反之,衛星測高技術則適用於此種大範圍高程測量,其利用衛星搭載儀器對地球高程進行量測,提供多時序、大範圍之高程資訊。
2018年由NASA所發射之ICESat-2即雷射測高衛星,目標提供近年之全球性高程資料(ATL08),可作為除了SRTM、ASTER GDEM、AW3D30等現有之全球性DEM之外的大範圍高程產品,有望於未來作為台灣大範圍高程資料的另一選擇,因而評估其高程於台灣之精度與特性有其必要性。
本研究分析ICESat-2 ATL08地形高程於台灣本島之精度表現,並針對土地覆蓋類別、坡度及海拔高度此三種影響因子分析其高程特性,另以DEM慣於管理及查找之鄉鎮市區單元及基本地形圖比例尺五千分之一圖框為單元,進一步以不同空間單元進行高程分析,最後針對不同影響因子分析其對於ICESat-2 ATL08地形高程之影響趨勢。
研究成果指出高程誤差隨土地覆蓋由無植被變為完全植被覆蓋而增加;坡度與高程誤差具正向關係,誤差增加幅度隨坡度之增加由高增加幅度遞減為低增加幅度,而後又增為高增加幅度,整體誤差趨勢線呈持續上升之現象;海拔高度與高程誤差同具正向關係,然誤差增加幅度隨海拔高度之增加而遞減,且高程誤差趨勢可依趨勢轉折處分為趨勢陡峭與趨勢平緩,各項成果將有助於ICESat-2高程資料日後應用於台灣作為參考。
ICESat-2, a laser altimetry satellite launched by NASA in 2018, aims to provide global elevation data (ATL08) in recent years. In addition to the existing global DEMs, it can be considered as another option for users in Taiwan. To understand the performance of this product, the accuracy of the elevation derived from ICESat-2 ATL08 was firstly evaluated. Then the factors influencing elevation accuracy, including land cover type, slope and altitude, were analyzed based on different spatial units.
Compared with the official DEM provided by the Ministry of Interior, the RMSE of elevation error ranges from 2.598 m to 13.009 m. After inspecting the influencing factors, it was indicated that the elevation error increases as the land cover changes from no vegetation to full vegetation coverage. Overall, elevation error increases with slope and elevation. The results are expected to be helpful for the applications of ICESat-2 elevation data in Taiwan as a reference.
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Description: 碩士
國立政治大學
地政學系
108257029
Source URI: http://thesis.lib.nccu.edu.tw/record/#G0108257029
Data Type: thesis
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