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NTDB & NTMS Specifications (250K & 100K)
Updated: 1 December 2007

2.2.7 Road Overpasses

2.2.7.1 Example 1
Location of Example: 152°34'51" East, 25°59'26" South
Distinctive Characteristics:
  • A Road Overpass is a separation of surface levels constructed to prevent direct intersection with another Road.
  • The shadow signature at the intersection of the two roads is confirmation of an overpass.
  • GA advise that Road Overpass capture when only SPOT imagery is available, should only be attempted with the aid of Reference Material or when certainty is high.
Regional Considerations:
Figure: 2.2.7.1 Representation of a Road Overpass.

Figure: 2.2.7.1a Orthophotography 60cm RGB=123 Figure: 2.2.7.1b SPOT 2.5m RGB=321

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