How do you read Hachure lines?

How do you read Hachure lines?

The hachures are arranged in rows perpendicular to their direction. The length and thickness of each stroke represents the drop in height along its direction: a short and thick stroke represents a short and steep slope, while a long and thin stroke represents a long and gentle slope.

What do Hachure lines indicate?

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 are the six rules for reading a topographic map?

Topographic Map Rules

• Contour Lines Never Cross.
• Measuring Steepness.
• Stream Flow Direction.
• Contours Close.
• Concentric Circles.
• Elevation Between Lines.

What are the rules for topographic maps?

The rules of topographic maps are:

• Each line connects all points of a specific elevation.
• Contour lines never cross since a single point can only have one elevation.
• Every fifth contour line is bolded and labeled.
• Adjacent contour lines are separated by a constant difference in elevation (such as 20 ft or 100 ft).

What do hachure lines or hachure marks indicate on a contour map?

There are three types of contour lines that you will encounter on a topographic map. Hachure contours – thick or thin brown lines with tick marks pointing towards the inside. Hachured contours indicate “closed depressions”.

How must contour lines bend to indicate a stream valley?

A contour line that bends to form a V shape indicates a valley. The bend in the V points toward the higher end of the valley; this V points upstream, or in the direction from which the water flows, if there is a stream.

What is the purpose of hachure marks on a topographic map?

Definition of hachure. One of a series of short, straight, evenly spaced, parallel lines used on a topographic map for shading and for indicating surfaces in relief (such as steepness of slopes), drawn perpendicular to the contour lines.

What do you understand by the valley line and ridge line?

A valley is an elongated depression in the landscape that is formed by the action of water (V-shaped) or carved out by glaciers (U-shaped). Two ridge lines run north-south connecting peaks on either side of the valley. Steep gullies and spurs run from ridge lines to valley bottom.

What are the rules for hachures in geography?

Several rules for hachures evolved amongst cartographers to ensure consistency in their use and interpretation. Besides the length and frequency of the lines, their thickness also conveys steepness. Thicker or darker lines mean a steeper slope, while thinner or lighter lines mean a gentler or shallower slope.

What are the characteristics of hachure lines?

Hachure lines are arranged in rows, the distance between them is constant, and all the lines on a particular row are the same length. A line joining the hachure lines on the uphill end can also denote the contour of the particular land feature.

What are the rules for hachure width and density?

Hachure width is thicker for steeper slopes. Hachure density remains constant throughout the map area. If the illumination is vertical, rule 5 is kept; in the case of oblique illumination, it is dropped. The rules above are to be obeyed for large-scale maps.

How do you represent relief with hachures on a map?

In representing relief with hachures on a map, six rules are to be followed, according to G.R.P. Lawrence (1979): The hachures are drawn in the direction of the steepest gradient. The hachures are arranged in rows perpendicular to their direction.