ENGLISH

25卷/2期

25卷/2期

華藝線上圖書館

Pages:

51-69

論文名稱

高時空融合影像在氣膠光學厚度反演之應用

Title

AOD Retrieval with High Temporal and Spatial Fused Imagery for Regional Air Quality Monitor

作者

郭人維、黃智遠、張國恩、林唐煌、劉振榮

Author

Ren-Wei Kuo, Chih-Yuan Huang, Kuo-En Chang, Tang-Huang Lin, Gin-Rong Liu

中文摘要

為獲取高時空解析之氣膠資訊,本研究針對自適應時空反射率融合模式 (STARFM) 於大氣層頂反射率之影像融合進行修正,並利用同時輻射率定法 (SRS) 反演氣膠光學厚度 (AOD),最後應用於地球同步 (Himawari-8) 與繞極軌道 (Landsat-8) 衛星影像在台灣地區空氣污染事件高時空解析之監測,結果以MODIS AOD產品和AERONET 地面觀測AOD,分別對大氣氣膠空間分布型態和AOD反演數值進行驗證,結果顯示本研究所反演之AOD與MODIS AOD在空間分布型態相當吻合,且反演數值在兩個案中分別有63%及80%的期望誤差內,呈現本研究所建構之方法在衛星反演高時空解析氣膠光學厚度,具極高之實用性及後續在PM2.5監測應用之潛能。

Abstract

Aerosol Optical Depth (AOD) is an important indicator of air quality. Through satellite observation, we can obtain comprehensive information on AOD in broad spatial distribution. Since the characteristics of aerosols are both short-lived and regional, the research aim to revise the Spatial-Temporal Adaptive Reflectance Fusion Model (STARFM) to get high spatial and temporal resolution images at top of atmosphere. Moreover, we use an algorithm called Simultaneous Radiation Solution (SRS) to retrieve AOD. To correct the limitation of SRS, which is only applicable for low surface reflectance area, we modify the SRS in this research and further apply it on a higher surface reflectance area. In short, we get high spatial and temporal AOD information through STARFM and SRS. After applying the improved high spatial and temporal algorithm on air pollution events in Taiwan, the result shows well consistence of spatial distribution with MODIS Dark Target AOD product in 3km resolution and similar trend with AOD retrieved from ground based AERONET data. The validation of AOD retrievals showed that there are 63% and 80% of retrieved AOD for each case located in expected error respectively. It indicates that the proposed approach equips with the high potential for providing AOD with both high spatial resolution and high temporal resolution from satellite observations.

關鍵字

高時空影像融合、自適應時空反射率融合模式 (STARFM)、氣膠光學厚度(AOD)、同時輻射率定法 (SRS)

Keywords

Image Fusion, Spatial Temporal Adaptive Reflectance Fusion Model (STARFM), Aerosol Optical Depth (AOD), Simultaneous Radiation Solution (SRS)

附件檔名

華芸線上圖書館

https://www.airitilibrary.com/Publication/alDetailedMesh?DocID=10218661-202006-202007010002-202007010002-51-69

備註說明

N / A

Pages:

71-86

論文名稱

優化魚眼鏡頭率定

Title

Optimization of Fisheye Lens Calibration

作者

楊軒、趙鍵哲

Author

Hsuan Yang, Jen-Jer Jaw

中文摘要

本研究為後續高精度 (前方交會誤差毫米等級,或小於地面取樣距離) 空間定位應用需求,採用基於魚眼投影幾何所推導出的物像對應模式搭配附加參數吸納透鏡畸變差。本篇文章主要著眼於魚眼鏡頭率定觀測資料蒐集面工作之優化,經實驗證實,於率定場中布設20個分布良好的率定標點以及位置適中的兩攝影站,並採用自率光束法搭配次像元像點與毫米級控制點觀測量,即可達至次像元之後驗單位權標準差 (0.24 pixels) 與前方交會誤差毫米級 (<5.6 mm,反投影約0.5 pixels) 之率定成果,顯示本研究方法及程序能有效及精準執行魚眼鏡頭率定,同時,物像對應品質亦足夠支援次像元等級的物空間定位應用。

Abstract

Since the fisheye lens has its own specific type of imaging formation, using collinearity equation attached by additional lens distortion parameters cannot set up a sufficient model. To achieve the relevant requirements of the metric measurement, this study adopts the rigorous object-image corresponding model to include geometric projection model for fisheye lens calibration. The discrepancy between the ideal image point and the actual image point is treated as the effect of lens distortion and modeled by additional parameters. This study aims to tackle effective implementation. It is revealed from the experimental results that the object-to-image correspondence of fisheye lens based on the proposed model offers satisfactory geometric calibration quality. Strategically, the bundle adjustment with self-calibration for fisheye lens can be realized under sub-pixel image measurement quality at the expense of only 20 well-distributed coded targets and acquiring two images at appropriate locations to achieve the sub-pixel level of object point positioning. Thus, it is verified that the proposed methods and procedures can effectively and accurately implement the fisheye lens calibration. At the same time, the calibration result is also sufficient to support the mission of object point determination up to sub-pixel level quality.

關鍵字

魚眼鏡頭、透鏡畸變、幾何投影、自率光束法、內部約制

Keywords

Fisheye lens, Lens distortion, Geometric projection, Bundle adjustment with self-calibration, Inner constraint

附件檔名

華芸線上圖書館

https://www.airitilibrary.com/Publication/alDetailedMesh?DocID=10218661-202006-202007010002-202007010002-71-86

備註說明

N / A

Pages:

87-114

論文名稱

探討應用空間統計與景觀格局分析於台南縣歷史圖資之時空分析

Title

Exploring the Spatial and Temporal Analysis of Tainan County’s Historical Maps by Using Spatial Statistics and Landscape Pattern Analysis

作者

韓威定、孔憲法、陳崇賢

Author

Wei-Ting Han, Shiann-Far Kung, Chung-Hsien Chen

中文摘要

本研究透過「臺灣百年歷史地圖」WMTS服務功能,將分別數化能完整覆蓋原台南縣之1904年臺灣堡圖與1989年經建版地形圖第一版,給予歷史圖像資料不同自定義之建成區綴塊作為分析基礎資料,並應用空間統計分析呈現各區域建成區的空間分佈特徵與差異,以及景觀格局分析判識綴塊的數量、面積、空間規模與型態特徵,此外部分類別之歷史統計資料與分析結果具高度相關性,促使在說明研究成果上更具解釋力,並於綜合比較之下得出1904年B與1989年E的自定義建成區相較貼近於實際狀況,雖同年度的不同自定義建成區可發現其空間特徵有著明顯差異,乃不易判定其結果哪個較佳,而是依據研究方向與目的去選擇較符合該框架下的自定義建成區。

Abstract

With the gradual maturity of geographic information system (GIS) technology, through the combination of GIS and historical data, the study of humanities and society in small-scale spatial regions is more common, but the spatial relationship between various regions in Tainan County is rarely discussed. Therefore, this research digitized the built-up area of Tainan County identified in the 1904 and 1989 historical topographic maps through the WMTS service function of the "Taiwan Centurial Historical Map" developed by the Academia Sinica. Then customize the different types of built-up areas as the basic data for the method of spatial analysis, landscape pattern analysis, and correlation analysis. This research method used kernel density estimation and hotspot analysis to explore the spatial distribution characteristics and differences of the built-up areas in each region. Besides, the landscape metrics can be used to calculate the number, area, spatial scale and type characteristics of the patch of the built-up areas. Also, the correlation strength and significance between the use of historical statistics and the analysis of analytical results have led to a more explanatory power in the discussion. In conclusion, the built-up areas in the eastern part of Tainan County are generally small and fragmented cold spots, while the western plains are hot spots with large areas. Moreover, the built-up area is highly correlated with the building land of the historical statistical data, indicating that the historical image has high explanatory power for various types of analysis.

關鍵字

台南縣、空間統計分析、景觀格局分析、歷史地圖

Keywords

Tainan County, Spatial Analysis, Landscape Pattern Analysis, Historical Maps

附件檔名

華芸線上圖書館

https://www.airitilibrary.com/Publication/alDetailedMesh?DocID=10218661-202006-202007010002-202007010002-87-114

備註說明

N / A

Pages:

115-128

論文名稱

合成孔徑雷達干涉產製數值高程模型影響因素評估—以季節像對與多視處理為例

Title

Evaluation of the Factors Influencing InSAR Digital Elevation Model – Case Study on Image Selection and Multi-look Processing

作者

吳彥誼、林士淵、任玄

Author

Yen-Yi Wu, Shih-Yuan Lin, Hsuan Ren

中文摘要

合成孔徑雷達干涉 (Interferometric Synthetic Aperture Radar, InSAR) 技術可以利用雷達資料的相位資訊取得三維的地表訊息。InSAR技術常應用於產製數值高程模型 (Digital Elevation Model, DEM),然而,雖然此項技術雖已被建立許久且發展成熟,其在應用上仍受到許多限制。本研究之宗旨有二,其一為針對不同季節的像對產製的數值地形模型做探討,其二為觀察多視步驟 (Multi-look processing) 在不同情況下採用的必要性。研究結果顯示,不論是否採用多視步驟,使用冬季像對可以提升結果精度,其比例最高達66.57%;在多視處理的部分,夏季像對若採用多視處理,精度可以提高15.14%~31.59%,然冬季像對若採用多視處理,精度則普遍降低,最差為-23.17%。

Abstract

Interferometric Synthetic Aperture Radar (InSAR) is one of the techniques used to extract three-dimensional ground surface information from the phase data recorded in radar images. InSAR technique is often applied to generate digital elevation models (DEMs). Although this technique has been developed maturely for a long time, it is found that the capability to produce high-accuracy DEM is limited. There are two aims in our research: the first is the discussion of using different seasonal dataset to generate DEMs, and the second is the observation the necessity of using multi-look processing in InSAR processing procedure. The result has shown that no matter if the multi-look processing is applied, using winter image pair is helpful to improve the accuracy up to 66.57%. For summer image pair, the accuracy could be enhanced by 15.14% to 31.59% if multi-look processing is applied, while for winter pair, the accuracy is degraded up to 23.17% if multi-look processing is applied.

關鍵字

合成孔徑雷達干涉技術、數值高程模型、季節像對、多視處理

Keywords

Synthetic Aperture Radar Technique, Digital Elevation Model, Seasonal Image Pair, Multi-Look Processing

附件檔名

華芸線上圖書館

https://www.airitilibrary.com/Publication/alDetailedMesh?DocID=10218661-202006-202007010002-202007010002-115-128

備註說明

N / A

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