7GlobalChangeDetectionPowerpnts

7GlobalChangeDetectionPowerpnts - Global Change/Time...

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Global Change/Time Series/Change Detection • Urbanization in the developing contries must now be recognized as a massive and irreversible phenomenon that demands the attention of LDC governments and donors in the 1990’s and beyond Office of Housing and Urban Programs, AID
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Rapid Urbanization a Global Phenomena • U.S. Census survey: only 2% • Only once in ten years – Austin Texas doubled in size twice in less than 5 years – Industrial restructuring and global capitalizm • Rapid growth for rural areas • Rapid growth for sunbelt locations
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Urbanization in LDC’s • St. Vincent’s Island – No mapping since Independence – Newest forest cover map was 1983 – Satellite image from 1987 used to update • Nigeria: no census for 40 years • Rapid growth of cities in Africa, Asia, • China adds 14 million urban residents a year Middle East and Latin America means Severe environmental degredation,pollution, health problems
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Remote Sensing Data Rapidly Expanding • MSS, TM, SPOT, TERRA,AQUA, LISS – Repeat coverage about 2 times a month since 1973 – Much data available free • Quickbird, Early Bird, Ikonos high resolution data available anywhere every 2-3 days • DOP usage rapidly expanding – USGS DOQQs every 5 years nationwide
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Monitoring Change through time • 3 Concepts – Global Environmental Change: • Everything is connected, cannot study in isolation • Effect of El Nino on Sahara • Tends to be hemispherical to global in scale – Time Series analysis • Can be global but usually is biome level • More than 2 dates • Can be seasonal change or multiyear at same month
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This note was uploaded on 12/21/2010 for the course GIS 4037c taught by Professor Roberts during the Spring '10 term at FAU.

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7GlobalChangeDetectionPowerpnts - Global Change/Time...

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