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No type definition was found for "Gathering-Aspect" in the abcd2 import.
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This is measured in either letters (e.g. NE, SW) or Degrees (e.g. 270).
This information is of particular interest in relation to exposure and incident sunlight.
The values in these fields are nearly always directional and restricted to mountainous or sloping ground.
Constraints in the context of ABCD 2:
- cardinality 0..1 (=optional single occurrence)