| 11. | The region is characterised by gently undulating terrain featuring several hilly farms and rural properties.
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| 12. | Maps produced specifically for orienteering show a more detailed and up-to-date description of terrain features.
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| 13. | This is usually expressed in terms of the elevation, slope, and orientation of terrain features.
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| 14. | Using Global Positioning System technology, terrain features are identified and plotted on the 3-D digital image.
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| 15. | Other terrain features and notable landmarks on the field have remained virtually unchanged since the battle.
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| 16. | Since it can only gather data from directly below the aircraft, it must predict future terrain features.
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| 17. | Information not directly relevant to instrument navigation, such as visual landmarks and terrain features, is not included.
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| 18. | Certain terrain features double the defensive benefit.
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| 19. | This feature is only readily visible at low angles of illumination, when shadows highlight the terrain features.
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| 20. | Most of the track was laid at ground level, although there were elevated portions above terrain features.
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