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Pre-Processing Techniques for SWReGAP Land Cover Analysis

Pre-Processing Techniques for SWReGAP Land Cover Analysis. T. Scott Schrader New Mexico Cooperative Fish & Wildlife Research Unit New Mexico State University, Las Cruces, NM. Southwest Regional GAP Project Arizona, Colorado, Nevada, New Mexico, Utah.

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Pre-Processing Techniques for SWReGAP Land Cover Analysis

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  1. Pre-Processing Techniques for SWReGAPLand Cover Analysis T. Scott Schrader New Mexico Cooperative Fish & Wildlife Research Unit New Mexico State University, Las Cruces, NM Southwest Regional GAP Project Arizona, Colorado, Nevada, New Mexico, Utah US-IALE 2004, Las Vegas, Nevada: Transdisciplinary Challenges in Landscape Ecology

  2. Initial Technical Steps in Production of Land Cover Data • ETM+ Characteristics and MRLC • Atmospheric Standardization Techniques • Cloud/Shadow Elimination

  3. LandSat 7 ETM+ • Spatial Resolution: 30m pixels, 172km2 • Spectral Resolution: 6 bands + • Temporal Resolution: Worldwide 16 days

  4. MRLC • Multi-Resolution Land Characteristics (MRLC) Consortium established 1992, revised 2001 • Consolidation of the acquisition of remote sensing data for multiple agency use • EPA, USGS, NBS, BLM, NOAA, NASA, USFS, EROS…

  5. MRLC • 3 Seasons: Green up, leaf on, leaf off • < 15% cloud cover • Geometric terrain correction • NALPS format • Standardized projection • Instrument artifacts removed

  6. Atmospheric Standardization • What is it? Why is it needed? • Tools for three methods of Standardization

  7. Atmospheric Standardization Tools

  8. Areas Contaminated by Clouds/ Shadows

  9. Outline Cloud/Shadow Areas

  10. Excise Contaminated Areas

  11. Start labeling Cloud/Shadows

  12. Labels Complete

  13. Recode Cloud/Shadow

  14. Clean Up Procedures • Clump: Mark pixels that are isolated • Eliminate: Replace isolated pixels with surrounding values • Neiborhood: Buffer areas slightly to include mixed pixels at edges

  15. Clouds/Shadows Masked

  16. Clouds/Shadows Removed

  17. Summary • ETM+ appropriate for regional land cover mapping • Atmospheric standardization to reduce scene to scene variability • Mask areas to provide the best possible “canvas” to characterize land cover

  18. For More Information • ETM+: http://ltpwww.gsfc.nasa.gov/IAS/handbook/handbook_toc.html • MRLC: http://landcover.usgs.gov/

  19. For More Information • Standardization Tools: http://www.gis.usu.edu/projects/swregap/ ImageStandardization.htm • SWReGAP: http://fws-nmcfwru.nmsu.edu

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