Geoscience Reference
In-Depth Information
Pasture
Forest
Water
0.5−0.59
0.61−0.68
0.79−0.89
1.58−1.75
Wavelength
Fig. 13.3
Spectral signatures of 3 landcover classes based on the radiometrically corrected SPOT
5image
In order to evaluate the output from the radiometric calibration, we plot spectral
profiles for three landcover types, namely: water, forest and pasture land Fig.
13.3
.
The graph indicates that the profiles are consistent with expected spectral profiles for
these landcover types and we can therefore assume that the radiometric calibration
has been completed successfully.
13.2 Download SRTM
The Shuttle Radar Topography Mission is a near-global digital elevation model
that was acquired by a RADAR instrument on board the Space Shuttle Endeav-
our. The data were acquired in February 2000 at a spatial resolution of 30m over
the United States and 90m for the rest of the world. The integration of digital
elevation data in Earth observation is frequently needed during image pre-processing
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