All base map information is usually monochrome. This scale was used primarily for trench raids and battle plans at the small unit level. Maricourt on sheet 62cNW at a scale of 1:20,000 These maps depict a real world area of 10 km running North to South and 16 km running East to West. Trenches and overprint information are present. This scale was primarily used by the artillery. Maricourt on sheet 62c at a scale of 1:40,000 These maps depict a real world area of 20 km running North to South and 32 km running East to West. Base map information like roads, canals, contour lines and wooded areas were printed in colour. Trenches are not usually present on these maps. This scale was used primarily by officers for planning. The relative difference between the three scales in coverage area is indicated by the shaded rectangles in the diagrams below. The three most common scales used were 1:40,000, 1:20,000 and 1:10,000.Īll three scales of maps were printed on the same size sheets measuring approximately 50 cm wide by 80 cm long from neatline to neatline. The scale of a WWI military map is usually conveyed by a representative fraction, graphic line or both. The most common contour intervals on WWI maps are 5 and 10 metres although some Belgian 1:10,000 scale maps had 1 metre intervals. For artillery purposes these exisitng maps were totally inadequate.Īn attempt was made to overlay contours onto these maps with hachures but it was soon decided that new maps would have to be produced. Since artillery had to be concealed in order to avoid being hit by enemy artillery, gunners had to fire blindly based on distance and elevation information provided by maps. A map is a symbolic representation that emphasises relationships, such as objects, regions, or themes, between elements of a certain space.The contour interval on a topographic map is the vertical distance between one contour line and the next.Īt the beginning of the war some of the only maps available of France had been produced in the 1880s at a scale of 1:80,000 and had hachures instead of contour lines to indicate changes in elevation. By joining points of equal elevation, the diagram shows how contour lines show relief.Ģ. Contour line, a line on a map reflecting an imaginary line on the surface of the earth, all points of which are above a date plane at the same elevation, typically meaning sea level. Option D is not the correct answer because the contour interval of the map is not 100 feet.ġ. Option C is the correct answer because the contour interval of the map is 50 feet. Option B is not the correct answer because the contour interval of the map is not 10 feet. Option A is not the correct answer because the contour interval of the map is not 25 feet. That means there is a gap of 50 feet for each counter side.ĥ0 * 10 (as there are 10 lines of contour between 10,50 marked points) = 500 feet. There are 10 counter lines between these two contour lines if we count. Let us take an example of two labelled contour lines.Īt 10,000 elevation, point D is labelled and the next label is labelled as 10,500 elevation. The contour interval in the specified figure is 50 feet. The vertical difference between the two contour lines perpendicular to each other is the contour interval. A contour map's contour interval is the difference between successive contour lines in elevation. A contour map is a map illustrated with contour lines, such as a topographical map showing valleys and hills and the steepness or gentleness of slopes, for example. It is a plane segment parallel to the plane of the three-dimensional graph of the f-function.Ģ. A curve along which the function has a constant value is a contour line of a function of two variables, such that the curve joins equal-value points.
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