What does a contour line with hachure marks on it indicate?

What does a contour line with hachure marks on it indicate?

Steep slopes (high angles from the horizontal) on topographic maps with a given contour interval will be represented by closely spaced contour lines. Concentric circles of contour lines indicate a hilltop; concentric circles with hachure marks indicate a close depression (Figure 7.6).

What do hachure marks represent?

Concentric circles of contour lines indicate a hilltop; concentric circles with hachure marks indicate a close depression (Figure 7.6).

What is a hachure on a map?

Definition of hachure (Entry 1 of 2) : a short line used for shading and denoting surfaces in relief (as in map drawing) and drawn in the direction of slope.

Why do contour lines bend and form a V shape with the presence of a river?

As a rule of thumb, the V-shaped contour is pointing upstream (the opposite direction from the flow of a stream or river). The “V” shape contours indicate streams and drainage. As you can see, the “V” points uphill to a higher elevation.

What are the disadvantages of Hachuring?

In hachures, on a gentle slope, lines become thin and are far apart from each other. These lines are closely spaced on a steeper slope. One disadvantage of hachures is that they do not tell us about the actual height above sea level.

What does a depression look like on a topographic map?

Contour lines that show a depression, crater, or sinkhole on a map are represented by dashed lines (hachure marks) on the inside of a contour line. The elevation of the first depression contour is the same as the nearest regular contour line.

What is causing the V shape in the topographic layers?

Which point on the map represents a depression?

If there is a low place such as a sinkhole, a crater, or another enclosed area of low elevation, it is called a depression. The hachure marks point downslope toward the center of the depression. The image to the right shows how a depression would be represented on a map.

Which side slope is the most gentle?

If you are using a topographic map, the most gentle slope will be where the lines are furthest apart.

How can you identify a steep area on a topographic map?

Interpreting Contour Maps

1. Closely-spaced contour lines indicate a steep slope, because the elevation changes quickly in a small area.
2. Contour lines that seem to touch indicate a very steep rise, like a cliff or canyon wall.
3. Broadly spaced contour lines indicate a shallow slope.

What does a hachure mean on a map?

A hachure map depicting Cortes’ invasion route of Mexico. Hachures are strokes (short line segments or curves) drawn in the direction of the steepest slope (the aspect direction). Steeper slopes are represented by thicker, shorter strokes, while gentler slopes are represented by thinner, longer and farther apart strokes.

How does the length of a hachure relate to its thickness?

The strokes have the same thickness inside a row. If the map is illuminated, strokes are thinner and farther apart on the illuminated side. Hachure length corresponds to the local horizontal distance between assumed contours of a certain interval Hachure density remains constant throughout the map area.

How are steeper slopes represented on a hachure map?

Steeper slopes are represented by thicker, shorter strokes, while gentler slopes are represented by thinner, longer and farther apart strokes. A very gentle slope or a flat area, like the top of a hill, is usually left blank.

What does a contour line on a topographic map mean?

Contour Line A line on a map that connects points of equal elevation. These lines not only show elevation but also show the shape of the land. Topographic Maps Contour Interval This is the difference in elevation between each line.