What is a topographical map explain its major cultural features shown on it with the support of drawings?
What are topographical maps? These maps show important natural and cultural features such as relief, vegetation, water bodies, cultivated land, settlements, and transportation networks, etc. In other words, it is a map of a small area drawn on a large scale depicting detailed surface features both natural and man made.
What are topographic features?
Topography is the shape and arrangement of physical features on a surface. In the case of geothermal exploration, horst and graben topography or volcanoes may indicate underlying structures and their associated processes that may be conducive to the development of geothermal systems.
How do you make a topographic map?
How do I construct a topographic profile?
- Sketch in the line on the map or locate the line that is provided.
- Place the edge of a blank piece of paper along the line and mark the starting and ending points of the line (label them with A and A’, or whatever the given line is labeled).
How do you read a topographic map?
Every point of the same contour line has the same elevation. One side of a contour line is uphill and one is downhill. Contour lines close to form a circle (or run off the side of the map). The area inside the circle is almost always higher than the contour line.
What is the ratio scale of this map?
Map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. For example, on a 1:100000 scale map, 1cm on the map equals 1km on the ground.
What is a contour profile?
A topographic profile or topographic cut is a representation of the relief of the terrain that is obtained by cutting transversely the lines of a topographic map. Each contour line can be defined as a closed line joining relief points at equal height above sea level.
How do you contour a survey?
Direct Method of Contouring In this method, the contours to be located are directly traced out in the ground by locating and making a number of points on each contour. These points are then surveyed and plotted on plan and the contours drawn through them.
How do you read contour lines?
How To Read Contour Lines
- Index lines are the thickest contour lines and are usually labeled with a number at one point along the line.
- Intermediate lines are the thinner, more common, lines between the index lines.
- Supplementary lines appear as dotted lines, indicating flatter terrain.
What is the distance between between each contour line called?
What is major and minor contour lines?
The major contour lines at the decades are logarithmic values that are equally spaced, and the minor contour lines are linear values that are logarithmically spaced.
What is difference between a contour interval and horizontal equivalent?
Contour interval (CI) is the difference of value of two consecutive contours (larger contour value – next smaller contour value). Horizontal equivalent is the horizontal distance between any two consecutive contours. Generally CI remains constant for any contour map, but horizontal equivalent varies with varying slope….
How many methods of contouring are present?
How do you do contour intervals?
Divide the difference in elevation between the index lines by the number of contour lines from one index line to the next. In the example above, the distance 200 is divided by the number of lines, 5. The contour interval is equal to 200 / 5 = 40, or 40-unit contour intervals.
What are the uses of contouring?
Uses of the Contour Lines
- To estimate the water storage capacity, back water limit and max .
- Volume of the proposed excavation wok,
- To decide whether certain location is visible from another location,
- To decide exact line of railway or road way haing safe slope,
- To determine the ground water level from contours of ground water.
What are Hachure lines?
Hachures are short lines laid down in a pattern to indicate direction of slope. When it became feasible to map rough terrain in more detail, hachuring developed into an artistic speciality.…
What is V rule?
“Knowing which way a river flows is often the key to being able to label contours correctly! Look at what happens to the contour lines in this picture when they cross a river! ” “They bend to form kind of a brown “V” shape!
What are form lines?
: a line drawn on a map to depict surface configuration in a generalized manner and usually without indicating elevations — compare contour line.
When land is steep contour lines lie farther apart?
The contour lines mark where the land surface is one inch higher than the previous contour line. If the land surface is steep, the contour lines will be closer together. If the land surface is gently sloping, the contour lines will be farther apart….