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Filling in the gapsin Landsat 7 data
Northwest GIS Users Group ConferenceBoise, Idaho, October 19 – 21, 2011
William J. KramberIdaho Department of Water Resources
Boise, Idaho
Dr. Richard G. Allen and Dr. Ricardo TrezzaKimberly Research Center, University of Idaho
Kimberly, Idaho
Landsat 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
Landsat 7
p40r30_l7_20110728.img
Gaps in Landsat 7Gaps in Landsat 7
Scan line corrector failed on May 31, 2003
ProceduresProcedures
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
Produce NDVINormalized Difference Vegetation Index
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
NDVI_toa.img
Change gaps to unique valueChange gaps to unique value
Compute mean NDVI of CLU polygons
Compute mean NDVI of CLU polygons
ArcInfo Zonal Statistics (ignore nodata, snap to input)
Input Output
Fill in gaps with mean NDVIFill in gaps with mean NDVI
Concern about Landsat’s futureConcern 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
Landsat used in Idahosince 1975
Landsat used in Idahosince 1975
Water rights monitoring Adjudication Land use and land cover mapping Conservation Reserve Enhancement Program Mapping Evapotranspiration
More InformationMore InformationFilling gapsChen,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.
Landsathttp://landsat.gsfc.nasa.gov/about/http://www.idwr.idaho.gov/geographicinfo/landsat/LandsatConcerns.htm
NDVIhttp://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
Landsat mosaic