2004 International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
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Figure 3. The study area over Caselle airport (Torino, Italy).
4. IMAGE GEOCODING
1, the
and 4.1 QuickBird PAN vs SPOTS-HRG
f the
the QuickBird panchromatic (PAN) acquisition has a nominal 0.61
oing. m GSD for nadir viewing and a maximum of 0.72 m GSD for
mage 25° off-nadir viewing, in the range of 450-900 nm wavelength.
n can The BRC60 camera mounted on the QuickBird satellite is a
ed in high-resolution pushbroom sensor with linear CCD arrays. ird PAN image (0.62 m GSD)
SPOT-5 satellite carries two HRG (High Resolution Geometric) - >
REF. sensors for high-resolution panchromatic acquisition in the
ges is range of 480-710 nm wavelength. Each HRG instrument
"mote acquires images with 5 m GSD, and the ground processing of
e the the data produces 2.5 m GSD images with same viewing
same geometry of the original images.
A first test involving multi-sensor and multi-resolution
* file, registration has been performed using the QuickBird and the
nport SPOT images. The QuickBird PAN image taken over the
hat a Caselle airport (Figure 4) and processed by GEOREF has a 0.62
m row GSD and a 0.63 m column GSD, while the SPOT5-HRG
jle as image (Figure 5) has a 2.5 m interpolated GSD.
ij Using GEOREF software, homologous CPs has been
automatically extracted and a six-parameter 2D affine
transformation computed for image georeference. Image data
fusion of QuickBird and SPOT-5 images are presented in figure
6.
| high
OT-5 4.2 Eros-Al stereo pair co-registration
r the
id the Eros-Al Standard Mode acquisition produces panchromatic
images, in the range of 500-900 nm wavelength, with a nominal
1.8 m GSD. The NA30 camera mounted on the Eros-Al
satellite is a high-resolution pushbroom sensor with 4 linear Fieure 5. SPOT-5 HRG (2.5 m GSD) over test area.
CCD arrays. Because of its asynchronous scanning mode (the =
satellite ground speed is faster than its rate of imaging), images
collected by Eros-Al shows image deformations and very
al use different geometry of the taken.
A second test involving different taken and strong geometrical
deformations has been performed using the Eros-Al stereo pair
taken over Caselle airport (Italy). Both image, processed by
GEOREF, had a 2.6 m GSD (Figure 7).
PAN GEOREF automatic procedure has leaded to obtain a precise
overlapping between the two images. Figure 8 shows this
multi-
efore,
data
results. In white and blue colours are represented Eros-Al
matic original images, and in yellow is represented the overlap
between them.
image
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