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Roads
In SPOT images, roads have the aspect of fine lineaments, typically 1 to 3 pixels broad.
Motor ways have a width from 6 to 7 pixels.
Their general properties are the following [R. Bajcsy, 1976] [J. Van Cleynenbreugel, 1990] [Ruskone, 1996]:
| Radiometry | Longitudinal radiometric variations are weak and texture is homogeneous, because the flooring is homogeneous. Generally a lineament stands out clearly from its environment.
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| Geometry | Curve and slope are low and their maximum values are conditioned by the type of landscape. Length is significant, and width constant. |
| Topology | Roads are connected into a network which presents few free ends and includes intersections. Roads connect urban zones. |
On multispectral images, roads are more visible in specific channels:
