Geography Reference
In-Depth Information
Figure 40.6 Integration and
analysis of countryside
survey data.
It was also designed as the baseline for monitoring
future change. The results of the next countryside
survey will be reported in around 2000; work is
already in progress and you can find updates by
visiting the ITE web site shown in the section on
additional sources of information at the end of this
chapter.
In addition to the field survey component of
CS1990, remotely sensed satellite data were used
to make a complete census of land cover in Great
Britain. The output from this component of
CS1990 was the LCMGB, which we discussed
above. Howard et al . (1996) described some of the
ideas behind linking these data with those of the
field survey. Since no earlier images were available,
this map was regarded as part of the 1990 baseline
against which future change might be determined.
A complete re-census of land cover using remotely
sensed images is, however, also planned as part of
Countryside Survey 2000, and so in the future it
may well be used to help us to understand where
changes in land cover within the British
countryside are taking place.
Map overlay is a simple and effective change
detection technique that can be used within a
GIS. It is fairly straightforward, for example,
using the type of vector data produced by the
field survey techniques used in CS1990. The
comparison of classified remotely sensed, raster
data can also be made using overlay-type
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