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An OD (Ordnance Survey) map are maps that were originally used for the military. It was produced by following a series of surveys. Hope this helps. :)
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On an Ordnance Survey map, a small black triangle represents a zoo. This symbol is used to denote the location of a zoo within the map area, making it easily identifiable for users. The black triangle is a standardized symbol used by Ordnance Survey to represent zoos across their maps for consistency and clarity.
The Ordnance Survey is called so because it was originally created by the British government's Board of Ordnance in the 18th century to map out strategic locations and military defenses. The term "Ordnance" refers to military supplies, weapons, and artillery used by an army.
Securing aerial maps before conducting a reconnaissance survey is essential to ensure accurate planning and navigation during the survey. It allows surveyors to identify key landmarks, potential obstacles, and specific areas of interest beforehand. Using up-to-date and precise aerial maps helps to improve the efficiency and effectiveness of the survey by providing clear guidance and reducing the risk of errors or misinterpretations.