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Filling in the gaps in Landsat 7 data

Filling in the gaps in Landsat 7 data. William J. Kramber Idaho Department of Water Resources Boise, Idaho Dr. Richard G. Allen and Dr. Ricardo Trezza Kimberly Research Center, University of Idaho Kimberly, Idaho. Northwest GIS Users Group Conference Boise, Idaho, October 19 – 21, 2011.

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Filling in the gaps in Landsat 7 data

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  1. Filling in the gapsin Landsat 7 data William J. Kramber Idaho Department of Water Resources Boise, Idaho Dr. Richard G. Allen and Dr. Ricardo Trezza Kimberly Research Center, University of Idaho Kimberly, Idaho Northwest GIS Users Group Conference Boise, Idaho, October 19 – 21, 2011

  2. Landsat Landsat 7 • USGS/NASA mission • L5 launched 1984 • L7 launched 1999 (damaged May, 2003) • 30 meter pixels • 16 day cycle • 100 by 100 miles • Free • Landsat 8 will launch in December 2012 • Landsat 9? NASA NASA

  3. p40r30_l7_20110728.img

  4. Gaps in Landsat 7 • Scan line corrector failed on May 31, 2003

  5. Procedures • Reproject Landsat 7 image to IDTM83 • Produce NDVI • Change gaps to unique value • Compute mean NDVI of CLU polygons • Fill in gaps with mean NDVI

  6. Produce NDVINormalized Difference Vegetation Index • ArcInfo tool developed by Eric Rafn • Converts Landsat bands 3 and 4 to reflectance • Outputs NDVI image • (IR – Red) / (IR + Red) • sensitive to vegetation density

  7. NDVI_toa.img

  8. Change gaps to unique value

  9. Compute mean NDVI of CLU polygons ArcInfo Zonal Statistics (ignore nodata, snap to input) Input Output

  10. Fill in gaps with mean NDVI

  11. Concern about Landsat’s future • Landsat 5 is 27 years old • Landsat 7 is 12 years old • Landsat 8 is scheduled for launch in Dec. of 2012 • Funding for Landsat 9 is uncertain

  12. Landsat used in Idahosince 1975 • Water rights monitoring • Adjudication • Land use and land cover mapping • Conservation Reserve Enhancement Program • Mapping Evapotranspiration

  13. More Information Filling gaps • Chen,J., et al., 2011, A simple and effective method for filling gaps in Landsat ETM+ SLC-off images, Remote Sensing of Environment, v.115, no.4, p.1053-1064. Landsat http://landsat.gsfc.nasa.gov/about/ http://www.idwr.idaho.gov/geographicinfo/landsat/LandsatConcerns.htm NDVI http://earthobservatory.nasa.gov/Features/MeasuringVegetation/measuring_vegetation_1.php Common Land Unit (CLU) http://www.fsa.usda.gov/FSA/apfoapp?area=home&subject=prod&topic=clu

  14. Landsat mosaic

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