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EXAMINING URBAN IMPERVIOUS SURFACE
DISTRIBUTION & ITS DYNAMIC CHANGE IN HANGZHOU
Longwei Li, Dengsheng Lu, & Wenhui Kuang
Presentation By: Josiah Parry
SOME NEW TERMS
➤ Impervious Surface Area (ISA)
➤ Man-made surfaces that water cannot penetrate
➤ Albedo
➤ proportion of light reflected from a surface
➤ Modified Normalized Difference Water Index (MNDWI)
➤ NDVI for water
➤ QuickBird
➤ Sub-meter accuracy imaging.
WHAT IS A DECISION TREE?
HANGZHOU
➤ 5.8 million people 1990
➤ 8.8 million people 2013
➤ GDP increased 315 Billion in
23 years
➤ Mountainous in the West
➤ STUDY GOAL:
➤ Track expansion of city
center.
➤ Focus on directions and
densification
METHODS
➤ Create fractional images (breaking down pixels into smaller
segments) why???
➤ Calculate MNDWI
➤ Use decision tree classification to produce High Albedo
(bright) & Low Albedo images
➤ Produces bright, dark, & confused ISA
➤ Cluster confused ISA and manually determine if ISA
➤ Compare ISA from different time stamps
➤ Preform accuracy assessment
METHODS CONT.
➤ Calculate density (D = ISA / A) for each fraction
➤ Calculate difference in ISA
➤ Diff = ISA(t2) - ISA(t1) / t2 - t1
➤ Two types of increased ISA
➤ Densification and Expansion
➤ Calculate ISA amounts for each Elevation and Slope
➤ Why would they do this?
RESULTS
SEE ANY PATTERNS?
QUICK EXAMPLE OF BAD VISUALIZATION
SLOPE ISA INTERACTION
SEE ANY PATTERNS?
SLOPE ISA INTERACTION
Remote Sensing Impervious Surfaces

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Remote Sensing Impervious Surfaces

  • 1. EXAMINING URBAN IMPERVIOUS SURFACE DISTRIBUTION & ITS DYNAMIC CHANGE IN HANGZHOU Longwei Li, Dengsheng Lu, & Wenhui Kuang Presentation By: Josiah Parry
  • 2. SOME NEW TERMS ➤ Impervious Surface Area (ISA) ➤ Man-made surfaces that water cannot penetrate ➤ Albedo ➤ proportion of light reflected from a surface ➤ Modified Normalized Difference Water Index (MNDWI) ➤ NDVI for water ➤ QuickBird ➤ Sub-meter accuracy imaging.
  • 3. WHAT IS A DECISION TREE?
  • 4. HANGZHOU ➤ 5.8 million people 1990 ➤ 8.8 million people 2013 ➤ GDP increased 315 Billion in 23 years ➤ Mountainous in the West ➤ STUDY GOAL: ➤ Track expansion of city center. ➤ Focus on directions and densification
  • 5. METHODS ➤ Create fractional images (breaking down pixels into smaller segments) why??? ➤ Calculate MNDWI ➤ Use decision tree classification to produce High Albedo (bright) & Low Albedo images ➤ Produces bright, dark, & confused ISA ➤ Cluster confused ISA and manually determine if ISA ➤ Compare ISA from different time stamps ➤ Preform accuracy assessment
  • 6. METHODS CONT. ➤ Calculate density (D = ISA / A) for each fraction ➤ Calculate difference in ISA ➤ Diff = ISA(t2) - ISA(t1) / t2 - t1 ➤ Two types of increased ISA ➤ Densification and Expansion ➤ Calculate ISA amounts for each Elevation and Slope ➤ Why would they do this?
  • 9.
  • 10. QUICK EXAMPLE OF BAD VISUALIZATION