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NGS Survey Data Explorer is an interactive map that will find markers in a selected location. Marker types identified. Marker links to data sheet. This website provides a state-by-state mapping of NGS survey marks on to Google Maps, enabling one to search for these marks visually. Description and history of the types of markers used in the ...
The term is generally applied to any item used to mark a point as an elevation reference. Frequently, bronze or aluminum disks are set in stone or concrete, or on rods driven deeply into the earth to provide a stable elevation point. If an elevation is marked on a map, but there is no physical mark on the ground, it is a spot height.
National Park standard point symbols, using shape to represent different types of facilities, a nominal variable. Size, how much space a symbol occupies on a map, most commonly refers to the area of point symbols, and the thickness of line symbols, although the cartogram controls the size of area features proportional to a given variable. Size ...
Monumentation: Placement and/or marking of physical objects on the ground to mark survey points and lines. Original survey: The first official government survey in a given area. Unless fraud is proven, the original survey is legally valid and binding, regardless of any surveying errors that may have occurred.
The measurements could then be plotted on a plan or map, and the points at the ends of the offset lines could be joined to show the feature. Traversing is a common method of surveying smaller areas. The surveyors start from an old reference mark or known position and place a network of reference marks covering the survey area.
A benchmark is usually set on the side, marked with the letters "O S B M" (Ordnance Survey Bench Mark) and the reference number of the trig point on a plaque called a "flush plate". Within and below the visible trig point, there are concealed reference marks whose National Grid References are precisely known.
The first basic military map symbols began to be used by western armies in the decades following the end of the Napoleonic Wars.During World War I, there was a degree of harmonisation between the British and French systems, including the adoption of the colour red for enemy forces and blue for allies; the British had previously used red for friendly troops because of the traditional red coats ...
Boundary markers have often been used to mark critical points [clarification needed] on political boundaries, i.e. those between countries, states or local administrations, but have also been used to mark out the limits of private landholdings, especially in areas where fences or walls are impractical or unnecessary. [citation needed]