Figure 9. Geocoding TIR mosaic over DOF image.
The quality of geocoding was checked on 52 points on all three
images and the mean deviations of points on both axes, related
to DOF are:
TIR VNIR
M',=+0.9m M,=1706m
M",=+11m (1) M',=+ 0.4 m (2)
The mean deviations of position are:
M'"tl^m (3) M,=+t07m (4)
When the TIR mosaic was compared with VNIR mosaic, it
resulted in the following values:
1.0 m
1.1 m
1.5m
(5)
Il
I
I+ I+ qu
M,
M,
M,
The selection of checking points for the quality of geocoding
stipulates TIR image because the good identical details are more
difficult to recognise on TIR then on VNIR and DOF.
146
Figure 10. Overlapping of DOF, VNIR and TIR images with
marked identical points for the analysis of deviation.
Figure 11. Comparison of maping contents VNIR (green) and
TIR (red) details after geocoding.
4. RADIOMETRY
Geocoding has improved the quality of geometrical
relationships between the details on mosaics, but it has to be
determined what happened with radiometry regarding to
interpolation during the mosaicking and geocoding. VNIR
images in mosaic are RGB images (blue, green and infra red
channel). For analysing radiometric quality of mosaics the
comperison of histograms of 3 samples from geocoding mosaics
with histograms of original images which show the same area
like the samples do, was done.
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