What does a contour map show?
Contour lines connect a series of points of equal elevation and are used to illustrate relief on a map. They show the height of ground above mean sea level (MSL) either in metres or feet, and can be drawn at any desired interval.
How do you find hilltops on a topographic map?
On a topo map look for a blue line that marks the path of the water. That is the first giveaway. But many seasonal streams may not have a blue line, so also look for the “V” shape in the contour lines. The bottom of the V will point uphill.
How are contours interpreted?
** Close together contours indicate steep slope, wall, or cliff. ** Close together contours at the top of a hill indicate a pointed hilltop. ** Crossing or touching contours indicate overhanging cliff. ** Jagged, rough contours indicate large outcrops of rocks, cliffs, and fractured areas.
What does a depression look like on a contour 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 are 3 types of contour lines?
Contour lines are of three different kinds. They are the Index lines, Intermediate lines and the Supplementary lines.
What are the 5 Rules of contour lines?
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. Rule 4 – every 5th contour line is darker in color.
What does a spur look like on a map?
A spur is a long, gently-sloping ‘tongue’ of ground that runs down from a hill to lower ground. You can spot a spur on the map quite easily – it looks like a long, narrow tongue of contour lines, dropping away from a mountain top or a ridge.
Why do contour lines never cross on a topographic map?
Contour lines never cross on a topographic map because each line represents the same elevation level of the land.
What are the 3 types of contour lines?
What does a cliff look like on a map?
Cliff-a vertical or near-vertical slope. A cliff may be shown on a map by contour lines being close together, touching, or by a ticked “carrying” contour line. The ticks always point toward lower ground.
What are the 2 types of contour lines?
i) Index lines show the elevation of a place above sea level. They are the thickest contour lines and are usually labelled with numbers. ii) Intermediate lines are thinner lines between the index lines. Usually, there are five intermediate lines after each index line.
Can contour lines touch?
Rule 3 – contour lines do not touch or cross each other except at a cliff. Rule 4 – every 5th contour line is darker in color. This is an INDEX contour line. Rule 5 – Contour lines are closer together in steep terrain and farther apart in flat areas.
How does a contour line on a map work?
Contour lines make a “v” pattern as they cross streams and rivers, and the “v” always points towards the upstream direction. As you draw a contour line on a map you will notice that the elevations on one side of your line will be lower elevations, and elevations on the other side of your line will be higher elevations.
How tall is the contour line on a hill?
For example, the first hill on the left has a top contour line of 50ft. Because there isn’t a 60ft contour line on this hilltop, we know that the hill’s highest point (the crest) is some elevation between 50 and 60ft.
Where are the contour intervals on a topographic map?
Maps in mountainous areas may have contour intervals of 100 feet or more. The contour interval is printed in the margin of each U.S. Geological Survey (USGS) map. Bathymetric contours are shown in blue or black, depending on their location. They show the shape and slope of the ocean bottom surface.
What do concentric circles mean on a topographic map?
Concentric circles indicate a hill. When contour lines form closed loops all together in the same area, this is a hill. The smallest loops are the higher elevations and the larger loops are downhill. On the Stowe map, which hill has an elevation of 1122 feet?
