the aim of promoting the use of satellite images and particularly
images produced by the new generation of satellites equipped with
very high resolution sensors (from 4 to 1m) aboard,
the Belgian science policy has published the poster 'Belgian cities
seen from space'.
This poster, produced by the Surfaces Laboratory at the University
of Liège, shows images of Brussels, Liège and Ghent.
They have been reproduced in natural colours and were obtained from
Ikonos images. The poster is part of the 'City
promotion' project, an Internet site designed to promote these
three cities on the Web by means of satellite imagery.
The use of very
high resolution satellite images
new millennium sees the dawn of a new era for earth observation.
The new generation of satellites with very high resolution (1-4
m) sensors aboard offers new possibilities due to the aerial photograph-like
quality of the images.
The advantages of these images
are manifold: high data acquisition rate because of the ever increasing
number of satellites in orbit, digital data recording for direct
use in GIS systems, importance of large area coverage, …
Today, the use of very high resolution images plays a commanding
role in areas such as regional and urban planning, geomarketing,
risk and hazard assessment for insurance companies,…
The 1 m spatial resolution on offer by Ikonos allows for large scale
reproductions such as the 1 / 3 000 samples shown above. In addition
to the visible light channels, the near infrared channel proves
useful for vegetation monitoring applications.
The images above are the result of a fusion combining the 4 m resolution
visible light channels and the 1 m panchromatic black and white
channel. The result thus obtained is a 1 m image in natural colours.