Question: What Do The Numbers Mean On A Topographic Map?

What are 3 types of contour lines?

There are 3 kinds of contour lines you’ll see on a map: intermediate, index, and supplementary.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.More items….

What is the space between contour lines called?

The space between the contour lines is called the contour interval and represents a specific (set) distance. If the contour interval is 50 feet, the vertical space between the two contour lines is 50 feet.

What is the point of contouring?

What is the purpose of contour? The whole point of contouring is to enhance or change the shape of your face with makeup, but its effects don’t have to be all that drastic. “From 2012 to 2018, contouring based on your face shape was seemingly very important,” says LA-based makeup artist Jenna Nicole.

What does a cliff look like on a topographic map?

Cliff: A cliff is a vertical or near vertical feature; it is an abrupt change of the land. When a slope is so steep that the contour lines converge into one “carrying” contour of contours, this last contour line sometimes has tick marks pointing toward low ground (image below).

How do you read a topographic map color?

Reading Topo Maps: Understanding Map Symbols and ColorsRED -Overprinted on primary and secondary roads to highlight them. … BLACK -Manmade or cultural features.BLUE -Water-related features.BROWN -Contour lines and elevation numbers.GREEN -Vegetation features.WHITE -Sparse or no vegetation. … PURPLE -Denotes revisions that have been made to a map using aerial photos.

What are topographic symbols?

A topographic map shows more than contours. The map includes symbols that represent such fea- tures as streets, buildings, streams, and vegetation. These symbols are con- stantly refined to better relate to the features they represent, improve the appearance or readability of the map, or reduce production cost.

What are the five map symbols?

Most maps will have the five following things: a Title, a Legend, a Grid, a Compass Rose to indicate direction, and a Scale. The Title tells you what is being represented on the map (i.e. Austin, Tx).

What do the colors mean on a topographic map?

Topographic maps use green to denote vegetation such as woods, while blue is used to denote water features like lakes, swamps, rivers, and drainage. … Red is used for man-made features, like main roads or political boundaries, and purple for new changes or updates on the map that weren’t previously represented.

What are map key symbols?

Symbols are small pictures that stand for different features on a map. A symbol is often drawn to look like what it represents. For example, a triangular shape is often used to denote a mountain. A desert is often shown by a group of dots that might look a little bit like sand.

What does pink mean on a topographic map?

– Brown – contour lines (elevation information) – Black – man-made/cultural features (buildings, place names, boundary lines, roads, etc.) – Red – Highways and major roads, Township/Range/Section information. – Pink – urban areas. – Purple – reflect revisions to a map but is no longer used on maps in production.

What does a physical map show?

Physical Maps – illustrate the physical features of an area, such as the mountains, rivers and lakes. Topographic Maps – include contour lines to show the shape and elevation of an area.

What 2 types of lines show elevation differences?

Contour lines are used to show elevation on a topographic map. Lines or isolines on a map that connect points with the same elevation. What does each contour line on a map show? Each contour line shows a different elevation.

What do the numbers on contour lines mean?

The elevation of land is its height above sea level. The numbers written on contour lines indicate the elevation of the lines. Topographic maps would be very cluttered if all contour lines were labeled, so only the heavier lines show labels. … The contour interval tells the vertical distance between neighboring 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 is contour curve?

A contour line (also isoline, isopleth, or isarithm) of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value. It is a plane section of the three-dimensional graph of the function f(x, y) parallel to the (x, y)-plane.

Why can’t contour lines cross?

Contour lines can never cross one another. Each line represents a separate elevation, and you can’t have two different elevations at the same point.

Do special purpose maps frequently use images and keys for identification?

Special purpose maps frequently use images and keys for identification. … Physical maps are not used to display elevations or the Earth’s features.

How do you read elevation?

On elevation charts, the elevation (listed in feet or meters above sea level) is located on the left side of the chart and reads from low (on the bottom) to high (on the top). The distance of the race is located along the bottom of the chart and will read from left to right in miles or kilometers.

What do the numbers on a topographic map indicate?

Contour elevation numbers indicate the direction of elevation by always reading (pointing) uphill. What is scale? Maps are made to scale. In each case, the scale represents the ratio of a distance on the map to the actual distance on the ground.