CI PA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkey
the scale of the reference cartogaphy). A geometric answer
gives indications on the scale of the map. But what about the
image contents? Are particulars that are really changed
distinguishable? Can they be correctly digitised? How can
building relief displacement limit the graphical reproduction?
It is the authors opinion that visual interpretation of
orthoprojected images can effectively be used for planimetric
updating of any available cartography (depending on the map
scale).
The simple adopted process is based on an accurate visual
comparison between the reference cartography and the
orthoprojected image; cartography overlapping onto the
orthoimage is a simple and useful tool to proceed with the
digitisation of the elements that are not present or changed.
The following three figures show the area of the Venaria Reale
Gardens that is at the moment being restored: in this example
the new positions and shapes of the gardens have been updated
on the Regional Technical Map (1:10000)
The same example can also be used to demonstrate how the past
territorial management damaged an important cultural site,
permitting sports and factory buildings to be built in the
immediate surroundings of the palace. A satellite orthoimage
can therefore be considered an economic evaluating tool in the
hands of administrative bodies.
Figure 4. Spot 5 image (2.5m) of the Venaria Reale area
Figure 5. QuickBird image (0,61m) of the Venaria Reale area
Figure 8. 1:10000 Regional Technical Map overlapping the
Spot5 orthoprojected image of the Stupinigi test site.
Figure 6. The 1:10000 Region Technical Map before updating
Figure 7. The 1:10000 Region Technical Map after updating
(darker lines)
l fjj •«< v: ty
