Image Processing Reference
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Fig. 8.5 Spatial correspondence between Cities Revealed™ aerial photograph of Belfast (at spatial
resolution of 15 cm) and COMPAS™ points (squares proportioned by area attributes)
buildings, a unique feature only available in COMPAS TM . White areas of the image
have been classified as buildings, light gray as roads, and dark gray as non-built
biophysical land covers. Four distinctive residential building types are evident in
Figure 8.6 and are labeled as follows.
A. This is an area of very high density residential buildings, showing highly linear
arrangement, and is similar to the patterns in Residential-1.
B. In contrast to A, this area has lower density with less of a linear arrangement, and
demonstrating a mixture of Residential-3 and Residential-4.
C. Here, medium density and linear arrangements are recognizable and associated
with Residential-1 and Residential-2.
D. Lastly, a very low density pattern of residential buildings, indicative of a combi-
nation of Residential-3 and Residential-6.
As this subset is a residential suburb of Belfast, only one commercial pattern is
observable, at E , which is similar to Commercial-3. Note the large area of built
pixels to the west of X . These correspond to non-residential buildings, in this case,
a school. This is because the highly irregular form of non-residential buildings can
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