i-chun fan research fellow , institute of history and philology,
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Maps, Aerial Photos and Satellite Images on Environment Change - A Case Study of the Chenyoulan River Watershed, Taiwan. I-Chun Fan Research Fellow , Institute of History and Philology, Executive Officer , Center for Geographic Information Science, - PowerPoint PPT PresentationTRANSCRIPT
Maps, Aerial Photos and Maps, Aerial Photos and Satellite Images on Satellite Images on
Environment ChangeEnvironment Change- A Case Study of the - A Case Study of the
Chenyoulan Chenyoulan River Watershed, Taiwan River Watershed, Taiwan
I-Chun FanResearch FellowResearch Fellow, Institute of History and Philology, , Institute of History and Philology,
Executive OfficerExecutive Officer, Center for Geographic Information Science,, Center for Geographic Information Science,
Research Center for Humanities and Social Sciences, Research Center for Humanities and Social Sciences,
Academia SinicaAcademia Sinica
OverviewOverview
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Archiving Maps, Remote Sensing ImageryArchiving Maps, Remote Sensing Imagery at GIS Center, Academia Sinicaat GIS Center, Academia Sinica
What the Maps and Remote Sensing Imagery can What the Maps and Remote Sensing Imagery can Help on the Studies of Enviroment ChangesHelp on the Studies of Enviroment Changes
Case study of Landscape Changes in the Case study of Landscape Changes in the Chenyoulan River Watershed, TaiwanChenyoulan River Watershed, Taiwan
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Digital Archives of Maps and Remote Digital Archives of Maps and Remote Sensing Imagery at GIS CenterSensing Imagery at GIS Center URL: http://gis.rchss.sinica.edu.tw/mapdapURL: http://gis.rchss.sinica.edu.tw/mapdap
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Topographic Map of Taiwan (1882)
Formoza Island(1845) Aerial Photo (1946)
WebGIS-based Remote Sensing Imagery Management System
Query System
Digitizing Process
Remote Sensing Aerial Photos33,892 aerial photos of Taiwan during the 1940s. 25,788 aerial photos of China during the 1950s. More tahn15,000 rolls of aerial photo negatives total, (c. 2,000,000 sheets)Historical MapsAround 100,000 maps of China.Around 30,000 maps of Taiwan.
Remote Sensing Aerial Photos33,892 aerial photos of Taiwan during the 1940s. 25,788 aerial photos of China during the 1950s. More tahn15,000 rolls of aerial photo negatives total, (c. 2,000,000 sheets)Historical MapsAround 100,000 maps of China.Around 30,000 maps of Taiwan.
Content Management SystemsContent Management Systems
Issues Clarified through Maps, Issues Clarified through Maps,
Aerial Photos and Satellite Aerial Photos and Satellite Images Images in Historical Perspectivein Historical Perspective
Issues of Land Use and Socio-economic Issues of Land Use and Socio-economic DevelopmentsDevelopments
(Deforestation, Cultivation, Roads)(Deforestation, Cultivation, Roads)
Hillside Disasters Hillside Disasters (Landslides, Deris (Landslides, Deris
Flows) Flows)
Long Time Long Time ScaleScale
Settlement DistributionSettlement Distribution
Geomorphological Change Geomorphological Change and River Rehabilitationand River Rehabilitation
Environmental Conservation IssuesEnvironmental Conservation Issues
Historical transitionHistorical transition
Short Time Short Time
ScaleScale
Spatio-temporal GIS Platform
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Study AreaStudy Area- The Chenyoulan River - The Chenyoulan River Watershed Watershed Area: 448 km2Area: 448 km2
Length: 42.4 kmLength: 42.4 km With Steep SlopeWith Steep Slope Many River Many River
TerracesTerraces High Turbidity High Turbidity
Stream FlowStream Flow Many Landslides Many Landslides
& Debris Flows & Debris Flows occurred occurred
National Forest National Forest Area & Aboriginal Area & Aboriginal Reserved landsReserved lands
Rectification & Georeferencing Rectification & Georeferencing of Maps, Aerial Photos and of Maps, Aerial Photos and Satellite Images Satellite Images
Using Watershed boundaries as Ground Control Points
Application of the High Resolution Application of the High Resolution DTMs DTMs to Generate Precise Watershed to Generate Precise Watershed Boundaries Boundaries 5m 10m 20m 30m 40m
2D Images of the2D Images of theChenyoulan River WatershedChenyoulan River Watershed
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3D-Platform of the3D-Platform of theChenyoulan River WatershedChenyoulan River Watershed
Geomorphological Changes of Geomorphological Changes of
the River Terrace and the River Terrace and Landslides (3D)Landslides (3D)
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The Spatio-temporal The Spatio-temporal Framework of the Chenyoulan Framework of the Chenyoulan River Watershed,River Watershed,1946~2010- Extended Issues1946~2010- Extended Issues
Spatial correlation Spatial correlation between between deforestation, deforestation, cultivation, roads cultivation, roads and landslidesand landslides
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Land Use Land Use of the of the Chenyoulan River Chenyoulan River WatershedWatershed from 1946-2002from 1946-2002
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Reserved Area of the Indigenous Reserved Area of the Indigenous People in the Chenyoulan River People in the Chenyoulan River WatershedWatershed -Restricted Stages (1946)-Restricted Stages (1946)--Green: Deforestation areaGreen: Deforestation area; ; Red: Cultivation Red: Cultivation ; ; Pink: Landslides Pink: Landslides
Reserved Area of the Indigenous Reserved Area of the Indigenous Peoples in the Chenyoulan River Peoples in the Chenyoulan River WatershedWatershed - Interim between Restricted and Developed Stages (1971)- Interim between Restricted and Developed Stages (1971) - -Green: Deforestation areaGreen: Deforestation area; ; Red: CultivationRed: Cultivation; ; Pink: Landslides Pink: Landslides
Reserved Area of the Indigenous Reserved Area of the Indigenous People in the Chenyoulan River People in the Chenyoulan River WatershedWatershed - Contemporary Situation(2011)- Contemporary Situation(2011)--Green: Deforestation areaGreen: Deforestation area; ; Red: CultivationRed: Cultivation; ; Pink: Landslides Pink: Landslides
Spatial Correlation between Spatial Correlation between Deforestation, Cultivation, Roads Deforestation, Cultivation, Roads and Landslides by 1946and Landslides by 1946Large deforestation areasLarge deforestation areasFew landsilde occurred in deforestation area Few landsilde occurred in deforestation area
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Spatial Correlation between Spatial Correlation between Deforestation, Cultivation, Roads Deforestation, Cultivation, Roads and Landslides by1971and Landslides by1971Deforestation area reduced and fragmentedDeforestation area reduced and fragmentedIncrease of cultivation and roadsIncrease of cultivation and roadsSmall landslides increased Small landslides increased
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Spatial Correlation between Spatial Correlation between Deforestation, Cultivation, Roads Deforestation, Cultivation, Roads and Landslides by 2002and Landslides by 2002Deforestation area was fully recoveredDeforestation area was fully recoveredLand cultivation grew with road developmentLand cultivation grew with road developmentMany new landsildes occurred along roadsMany new landsildes occurred along roads
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ConclusionConclusion Visualization of Landscape Changes. Visualization of Landscape Changes.
Spatial Qualitative to Quantitative Spatial Qualitative to Quantitative Analysis.Analysis.
Building A Spatio-temporal Platform Building A Spatio-temporal Platform Serves for Interdisciplinary Approach to Serves for Interdisciplinary Approach to the Environmental Issues the Environmental Issues
Thank you for your attention !