Question: How Much Area Does A 7.5 Minute Map Cover?

What are the two types of map scales?

There are two main types of map scales: bar and lexical..

How do you write scaling?

A scale of 1 : 100 000 means that the real distance is 100 000 times the length of 1 unit on the map or drawing.Example 14. Write the scale 1 cm to 1 m in ratio form. … Example 15. Simplify the scale 5 mm : 1 m. … Example 16. Simplify the scale 5 cm : 2 km. … Example 17. A particular map shows a scale of 1 : 5000. … Example 18.

How is scale written?

It can be written in three ways, the verbal scale, the graphic scale, and the representative fraction (RF) or fractional scale. The verbal scale is a simple statement of the scale such as one inch equals one mile or 1″ = 1 mile. … To use the graphic scale, mark the distance between points on the edge of a sheet of paper.

How is graphical scale more useful than RF?

Graphic scale remains accurate if a map is enlarged or reduced. Verbal and RF scales do not. On a graphic scale, the intervals must be convenient round numbers. example: ground distance = 5 km, map distance = 2 cm.

Why is zero not on the far left on graphic?

Why isn’t “0” at the far left of the scales? Easier to read fractions of miles, etc. If a map with these graphic scales is enlarged along with the scales (such as by using a photocopy machine): … They were enlarged the same amount as the map.

What is a USGS 7.5 minute quadrangle map?

The best known USGS maps are the 1:24,000-scale topographic maps, also known as 7.5-minute quadrangles. From approximately 1947 to 1992, more than 55,000 7.5-minute maps were made to cover the 48 conterminous states.

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 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 1 24000 mean on a map?

For example, a map scale indicating a ratio of 1:24,000 (in/in), means that for every 1 inch on the map, 24,000 inches have been covered on the ground. Ground distances on maps are usually given in feet or miles.

What do we call the difference between the highest and lowest point on a map or feature?

The of an area is the difference between its high and low points. For example, subtracting the lowest elevation on the map from the highest gives you a measure of the area’s relief. contour lines, A topographic map shows the land as if you were above the land looking down on it.

How do you read a map with degrees and minutes?

The line of longitude is read as 2 degrees (2°), 10 minutes (10′), 26.5 seconds (12.2”) east. The line of latitude is read as 41 degrees (41), 24.2028 minutes (24.2028) north. The coordinate for the line of latitude represents north of the Equator because it is positive.

What does 1 50000 on a map mean?

The scale on a map is the ratio between real life sizes and how many times it has been shrunk to fit it on the map. On a 1:50,000 scale map, 1 cm on the map represents 50,000 cm on the ground (= 500 m or 0.5 km).

How big is a 7.5 minute map?

The largest-scale USGS maps are the 1:24,000-scale (1 inch representing 2,000 feet, or 1 centimeter = 240 meters) topographic maps, also known as 7.5-minute quadrangles. Four 7.5-minute sheets replace one 15-minute sheet depicting the same geographic area. Each sheet is 22″ x 27″ in size and covers 49-70 square miles.

How do you read a 7.5 minute map?

At the equator, one degree of longitude equals 67 miles, but at the poles one degree has no distance at all. So a 7.5 Minutes Map will always cover roughly 8.5 miles of latitude (North to South) but a varying amount in longitude (East to West).

What is the quadrangle name?

A “quadrangle” is a topographic map produced by the United States Geological Survey (USGS) covering the United States. The maps are usually named after local physiographic features. The shorthand “quad” is also used, especially with the name of the map; for example, “the Ranger Creek, Texas quad”.

What does contour line mean?

Contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level. map: contour lines. The diagram illustrates how contour lines show relief by joining points of equal elevation.

What scale are military maps?

Military City Map. A military city map is a topographic map (usually at 1:12,550 scale, sometimes up to 1:5,000), showing the details of a city.

What is a 7.5 minute series map?

For example, a 7.5-minute map shows an area that spans 7.5 minutes of latitude and 7.5 minutes of longitude, and it is usually named after the most prominent feature in the quadrangle. Others show a whole area—a county, State, national park, or place of special interest.

What is a 15 minute map?

Maps in the 15 Minute Quadrangle series were made in the period between the 1890s and the 1950s. They were created by the Map Division of the United States Geological Survey (USGS). The purpose for developing this series was to provide a detailed topographic map coverage of the entire United States at the same scale.

Why is it called a 7.5 minute map?

Traditional 7.5 Minute Topographical Map Note: a minute is one 60th of a degree, and not a measure of time. 7.5 Minute refers to the fact the map covers an area 7 minutes and 30 seconds of longitude by 7 minutes and 30 seconds of latitude.