Credit:
Landsat Project, http://landsat7.usgs.gov/
Figure 1:
Pan-sharpening with Landsat 7 ETM+
images. Input Landsat ETM+ images were processed
at Level 1G and resampled with Cubic Convolution
method (WRS-2 path 39, row 37, acquired 3/25/03)
.
| Left
image |
A
high-resolution Landsat ETM+ panchromatic
image (spatial resolution 15 m) |
| Middle
image |
A
low-resolution natural colour image
made up of Landsat ETM+ blue band (band
1), green band (band 2), and red band
(band 3) (spatial resolution 30 m)
|
| Right
image |
A
pan-sharpened, high-resolution colour
composite from HighView (spatial resolution 15 m)
|
|
Notes:
In HighView,
users can select any three of the six
30-m resolution multispectral bands
of Landsat ETM+ for pan-sharpening and
producing image composites in either
true or false colours.
Results from HighView band combination and pan-sharpening
modules can be used in conjunction with
the globle STRM terrain data at a spatial
resolution of 30 - or 90-m (available
at GLCF's website) to make realistic
3-D scenes for visualisation.
Using HighView,
existing 30- or 28.5-m resolution Landsat
ETM+ multispectral bands can be readily
transformed into 15- or 14.25-m resolution
for important global environmental impact
studies.
|
Credit: Global
Land Cover Facility (GLCF), http://glcf.umiacs.umd.edu/index.shtml
Figure 2:
Pan-sharpening with Landsat 7 ETM+
images. Input Landsat ETM+ images were processed
at Level 1G and
resampled with Nearest Neighbour method
(WRS-2 path 89, row 83, acquired 8/8/02; data
were not validated).
Left
image
|
A
high-resolution panchromatic image (spatial
resolution 14.25 m) |
Middle
image
|
A
low-resolution natural colour image
(spatial resolution 28.5 m) |
| Right
image |
A
pan-sharpened, high-resolution colour
composite from HighView
(spatial resolution 14.25 m)
|
|
Note:
Pan-sharpening
results are heavily dependent upon
the source and quality of input images.
Numerous factors impact the quality
of the input image, including pre-processing
levels and resampling methods.
In
this example, noises or "speckles"
in the Pan image are also visible
in the fused composite. HighView provides two smoothing methods to
reduce the noises, which are embedded
in an automated fusion process.
|
