What do hash marks mean on a topographic map?
A depression or hollow where the elevation drops and is surrounded by higher terrain will be marked by closed irregular contours with hash marks on the line. The markings point inward from the edge and indicate that the area inside is lower. These areas will appear to have a crater or bowl shape.
How do you identify a relief feature on a map?
The important methods of representing relief features are hachures, contours, form lines, spot heights, bench marks, trigonometrical points, hill shading, layer-colouring, and so on. Each method has its own merits and demerits in depicting the relief of the land. Hachures are small lines drawn to represent slopes.
What does the circled section of the map represent?
Widely spaced lines represent a gentle slope. The circled area on the map to the right indicates the steepest slope on the map where the contours are closest together. The distance between each vertical line is representative of the horizontal distance between each of the elevations in reality on the ground.)
What are the three types of contour lines army?
There are 3 kinds of contour lines you’ll see on a map: intermediate, index, and supplementary.
What is Rule #2 when reading a topographic map?
Rule 1 – every point of a contour line has the same elevation. Rule 2 – contour lines separate uphill from downhill. Rule 3 – contour lines do not touch or cross each other except at a cliff.
What are some topographical features?
Topographical Features Examples include mountains, hills, valleys, lakes, oceans, rivers, cities, dams, and roads. Elevation – The elevation, or height, of mountains and other objects is recorded as part of topography. It is usually recorded in reference to sea level (the surface of the ocean).
What are the 3 methods of map classification?
Maps may be classified according to scale, content, or derivation. The latter refers to whether a map represents an original survey or has been derived from other maps or source data.
What is red brown on a military map?
Colors Used on a Military Map
| Color | Description |
|---|---|
| Red | Classifies cultural features, such as populated areas, main roads, and boundaries, on older maps. |
| Brown | Identifies all relief features and elevation, such as contours on older edition maps, and cultivated land on red-light readable maps. |