The need to effectively monitor our resources and measure the impact
of events on our environment is becoming increasingly important. We now
realise that some events that take place half a world away can and do
affect us and we appreciate that timely information is a powerful and
vital part of decision making. I put it to you that in managing the resources
of our world for future generations, accurate information has never been
more essential. We MUST find ways to acquire the information we need to
study, at appropriate spatial and temporal scales, those areas of interest.
This topic investigates the potential role of remote sensing as a source
of geographical information.
For some years now, the science (and sometimes art) of remote sensing
has been recognized as a valuable tool for monitoring the Earth's natural
resources and built environment. Remote sensing has been described as
the means of sensing or measuring things (objects or areas) without coming
into direct contact with the phenomenon. An important question, therefore,
is - what exactly is measured? The answer is surprisingly simple - the
emitted, scattered and reflected electromagnetic energy from the phenomenon
under observation. Images of these measurements are then formed and useful
information can be extracted through visual or computer-assisted interpretation.
Let's find out more about Earth observation by remote sensing.