Working with Landsat Data

Submitted by dylan on Thu, 2005-12-29 07:03.

Fig.1 Bands 3,2,1

Fig.2 Bands 4,3,2

Fig.3 Bands 5,3,2

Fig.4 Blend with hillshade

Landsat Example: bands 3, 2, 1 with equalized colors

Fig.5 Histogram equalized 321

Background

Landsat TM and ETM+ sensor information
Data information and citation examples
Pan-sharpening example in GRASS via Brovey transform
Simple landscape classification example

Data Sources in order of ease of use

Sample GRASS commands

#display a true color composite image from Landsat TM data:
d.rgb r=landsat_band_3 g=landsat_band_2 b=landsat_band_1

#fuse bands into a single image:
r.composite r=landsat_band_3 g=landsat_band_2 b=landsat_band_1 out=landsat_bands_321

#blend landsat composite image with DEM data
#note that blending will require some tweaking: good results obtained with:
r.blend second=shaded_relief first=landsat_321 out=landsat_shade perc=6

#re-composite the blended results
r.composite landsat_shade.r g=landsat_shade.g b=landsat_shade.b out=landsat_shade.rgb

#create histogram equalized inputs (Fig 5)
r.colors map=landsat_band_1 color=grey.eq
r.colors map=landsat_band_2 color=grey.eq
r.colors map=landsat_band_3 color=grey.eq
r.composite r=landsat_band_3 g=landsat_band_2 b=landsat_band_1 out=landsat_eq_321

Simple comparison between the default output from r.composite on landsat bands 3,2,1 and the enhanced output from i.landsat.rgb.

Landsat Example: bands 3, 2, 1 standard r.composite

r.composite default

Landsat Example: bands 3, 2, 1 composite with i.landsat.rgb

i.landsat.rgb enhanced

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Working with Landsat Data