Vegetation and Population Density in Urban and Suburban Areas in the U.S.A. Francesca Pozzi Center for International Earth Science Information Network Columbia University New York, USA Christopher Small Lamont-Doherty Earth Observatory Columbia University New York, USA tanbul, 11-13 June 2002
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Vegetation and Population Density in Urban and Suburban Areas in the U.S.A. Francesca Pozzi Center for International Earth Science Information Network.
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Vegetation and Population Density in Urban and Suburban Areas in the
U.S.A.
Francesca PozziCenter for International Earth Science Information Network
Columbia UniversityNew York, USA
Christopher SmallLamont-Doherty Earth Observatory
Columbia UniversityNew York, USA
Istanbul, 11-13 June 2002
Objectives
• Characterize urban areas based on demographic and physical characteristics:– Population Density– Vegetation Abundance
• Examine consistency of relationship between the two variables in the USA
• Compare with existing land cover classification (USGS)
• Can this help us find alternative classification systems for urban areas?
Case Study: The USA
• 6 cities with different geographic location, physical environment and urban growth dynamics
AtlantaChicagoLos AngelesNew YorkPhoenixSeattle
Data: Population Density• 1990 US Census Bureau
population counts at the block level (Spatial and tabular data)
• Density in people/km2
• Data reprojected to UTM,
• Rasterized to 30 m,
• Co-registred to Landsat
New York City
Data: Vegetation Abundance• Landsat TM data, circa 1990• Spectral reflectance of many
urban areas can be described as linear mixing of:– Low albedo– High albedo– Vegetation
• Linear un-mixing• Fraction images showing areal
% of each endmember within each pixel (0 to 1)
• Validation with IKONOS, accuracy within 10%
Vegetation Fraction (White = 0, Dark Green = 1)
Data: USGS National Land Cover Dataset• Based on Landsat TM data