CIPA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkey 
Figure 8 shows how there is no obvious change in the Stupinigi 
test site that would require any updating of the cartography, if 
some agricultural boundaries are excluded 
5. THEMATIC MAPS DERIVED FROM 
PANSHARPENED IMAGES 
An added value of high resolution satellite images is due to the 
availability of different spectral bands, whose exploitation can 
be useful for map updating and cultural site management. 
Remote sensing classification techniques, or simple visual 
image interpretation, can be used to derive auxiliary information 
both for the updating (allowing a better discriminations between 
the objects) and for thematic map generation devoted to cultural 
site management. Information about the territorial/urban context 
can be derived from such data. The lower geometric resolution 
of the multispectral bands suggests a classification approach 
that is based on pan-sharpened bands. 
The pan-sharpening procedure generates a multispectral image, 
starting from a low resolution multispectral image (XS) and a 
high resolution panchromatic. In this case, due to the lack of 
correspondence between the spectral ranges of the panchromatic 
and the multispectral bands which results in radiometric 
anomalous pan-sharpened bands, a self-developed procedure 
was adopted. This procedure maintains the radiometric 
differences between the original multipsectral bands and the 
pan-sharpened ones (due to the previously mentioned problem) 
within an acceptable range, paying the price of a light 
smoothing of the data. The group is still working on this aspect. 
6. CONCLUSIONS 
This study leads us to conclude that the map updating problem 
based on high resolution satellite images must be considered 
from two different points of view: 
• the geometric/positioning one; 
• the information content one. 
It has been shown that Spot 5 images have an information 
content that is suitable for a 1:10000 scale map; unfortunately it 
has been demonstrated through positioning tests that the 
reachable accuracy it is not sufficient for that scale. 
Improvement can be obatined: 
• using a rigorous sensor model approach (we are 
currently working on this); 
• collecting the GCPs on larger scale maps or through 
GPS survey (GPS measurement campaign is currently 
being projected) 
Quickbird orthoprojected images instead present an accuracy 
that is suitable for a 1:10000 scale map. In this case buildings 
and relief displacements have to be considered: this problem 
can be dealt with by using a Dense DEM (DEM + height 
building information) while orthoprejecting. A DDEM could be 
generated trhough aerial laser scanner acquisition or dedicated 
softwares for numerical cartography processing (if height layer 
is available). 
According to technical rules adopted for the production of the 
used 1:10000 regional reference cartography, updated entities 
should be characterized by a quality code that specifier the 
updating method and source (orthoprojected satellite images). 
The solution of the correct orientation of along track stereopairs 
(i.e. Eros Al) could encourage map updating users towards map 
production. 
Finally it has been shown that high resolution satellite images 
represent an economic and reliable solution to monitor cultural 
heritage sites according to the scale map requider from the 
customer. 
REFERENCES 
Boccardo, P., Borgogno Mondino, E., Giulio Tonolo, F., 2003, 
Urban areas classification tests using high resolution pan- 
sharpened satellite images, Urban 2003 proceedings, Berlin 
Lingua, A., Borgogno Mondino, E., 2002, High Resolution 
Satellite Images Orthoprojection Using Dense DEM, Spie 2002 
proceedings, Creete 
Boccardo, P., Borgogno Mondino, E., 2001, Metric Quality 
Evaluation of Satellite High Resolution Images in Urban Areas, 
Urban 2001 proceedings, Rome 
Tao, C., Hu, Y., 2001, A comprensive study of the Rational 
Function Model for Photogrammetric processing, 
Photogrammetric engineering & Remote Sensing, December 
2001 
AA. VV., Capitolato d'oneri — Carta tecnica regionale 
numerica alia scala 1:10000, Regione Piemonte, Servizio 
Cartografico, 1994 
ACKNOWLEDGEMENTS 
The remotely sensed images that were used in this study were 
acquired as part of a 2 year project that is cofmanced by 
MURST (2001) entitled “The study of remotely sensed images 
for environmental analyses”