T14_Change Detection_3slides

T14_Change Detection_3slides - Geography 333 Remote Sensing...

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1 Geography 333 Remote Sensing I Topic 14: Change Detection 2 Readings Nov 23 - Topic 14: Chapter 12 – Change Detection Nov 25 - Guest Lecture: Change Detection Nov 30 - Topic 13: Chapter 13 – Thematic Map Accuracy Assessment (Part II) Dec 02 - Topic 15: Thermal Imagery (HEAT project) Dec 07 - In Class Final Exam (10% - 75 mins) 3 Outline Change detection – applications Considerations System characteristics Environmental characteristics Techniques Visualization/manual digitizing Multi date compositing Image differencing Post classification comparison Binary masks Spectral change vector analysis
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2 4 What is Change Detection? Mapping the spatial extent and magnitude of changes through time Maintaining the relevancy of spatial information • Vegetation • Urban growth • Coastal change • Disaster management • Global climate system 5 Landsat 1 MSS 57m->57m 11-16-1973 6 Landsat 4 MSS 57m->57m 05-08-1984
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3 7 Landsat 5 TM 28.5m->57m 08-03-1995 8 Landsat 7 ETM+ 28.5m->57m 03-31-2005 9 Nueces River, Texas MODIS
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4 10 Aral Sea, Kazakhstan Landsat/MODIS 11 Aral Sea, Kazakhstan Landsat/MODIS Once the world's fourth-largest inland sea with an area of 68,000 km², the Aral Sea has been steadily shrinking since the 1960s, after the rivers Amu Darya and Syr Darya that fed it were diverted by Soviet Union irrigation projects. By 2004, the sea had shrunk to 25% of its original surface area, and a nearly fivefold increase in salinity had killed most of its natural flora and fauna. By 2007 it had declined to 10% of its original size, splitting into three separate lakes, two of which are too salty to support fish. Source: Wikipedia Aral_sea 12 Urban Change – San Francisco Bay
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5 13 14 System Considerations Temporal resolution: Time of day Anniversary dates Spatial resolution: Sensors should be comparable Look angle: Different look angle different information content 15 12:23 19:23 2006-08-15 12:12 19:12 2005-07-20 11:59 18:59 2004-07-17 11:51 18:51 2003-06-04 Local Time (PDT) UTC Time (GMT) Acquisition Date Pan and MS (QB data) • Corrected to TOA reflectance • Co-registered, RMS < 1.2 m for MS RMS < 0.6 m for PAN Source: Wulder, M.A., White, J.C., Coops, N.C., Butson, C.R. 2008. Multi-temporal analysis of high spatial resolution imagery for disturbance monitoring. Remote Sensing of Environment, 112, 2729-2740.
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T14_Change Detection_3slides - Geography 333 Remote Sensing...

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