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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