| http://www.w3.org/ns/prov#value | - The obstructions can be divided into two groups: (1) Attenuating: Those objects, such as trees or other foliage, which partially reduce signal strength, and (2) Opaque: Those objects which effectively cut off the line-of-sight signal from the satellite completely, such as telephone poles, buildings, overpasses, or even other adjacent vehicles.
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