What are the symbols used on a map?
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 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 do we call the explanations of lines colors and symbols used on a map?
The first step in learning how to read a topographic map is to understand how to interpret the lines, colors and symbols. Lines on a topographic map can be straight or curved, solid or dashed, or a combination. These lines indicate boundaries, contours, roads, streams and more.
What do the symbols on a topographic map mean?
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.
Why do contour lines never cross?
Contour lines never cross on a topographic map because each line represents the same elevation level of the land.
What do contour lines that are close together represent?
Contour lines that are relatively close together indicate a slope that is fairly steep. Contour lines that are further apart indicates a slope that is relatively flat.
What is the fifth contour line called?
index contour
What is meant by contour interval?
A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing.
How do you determine contour interval?
Divide the difference in elevation between the index lines by the number of contour lines from one index line to the next. In the example above, the distance 200 is divided by the number of lines, 5. The contour interval is equal to 200 / 5 = 40, or 40-unit contour intervals.
What is the factors affecting contour interval?
Factors Affecting the Selection of Contour Interval
| Sl. No | Factors |
|---|---|
| 1 | Scale of the map |
| 2 | Extent of survey |
| 3 | Nature of ground |
| 4 | Time and resources available |
What are the factors on which contour lines are based?
The contour interval depends upon the general topography of the terrain. In flat ground, contours at small intervals are surveyed to depict the general slope of the ground whereas high hills can only be depicted with contours at larger contour interval.
What is ISO bath What are the factors on which contour lines are based?
In the study of the Earth’s magnetic field, the term isogon or isogonic line refers to a line of constant magnetic declination, the variation of magnetic north from geographic north. An agonic line is drawn through points of zero magnetic declination.
What factors might influence a cartographer’s choice of contour lines?
34 Cards in this Set
| What are contour lines? | Symbolic horizontal lines which indicate the height and shape of a slope. |
|---|---|
| Define cartographer. | A person who makes maps. |
| What factors might influence a cartographer’s choice of contour interval? | •Large areas-bigger intervals •small areas-smaller intervals |
What are the uses of contour maps?
Uses of contours maps
- Contours provide valuable information about the nature of terrain.
- To visualize the nature of ground along a cross section of interest,
- Contour map provides useful information for locating a route at a given gradient such as highway, canal, sewer line etc.
What are two applications of contour lines?
Uses of the Contour Lines
- To estimate the water storage capacity, back water limit and max .
- Volume of the proposed excavation wok,
- To decide whether certain location is visible from another location,
- To decide exact line of railway or road way haing safe slope,
What are the importance of contour lines?
These contour lines are an important way of showing the rise and fall of the land on a map. Contour lines show all the places that are the same height above sea level. They also tell us about the slope of the land. On a steep slope, the lines are close together.
What are four main uses of topographic maps?
Topographic maps have many multiple uses in the present day: any type of geographic planning or large-scale architecture; earth sciences and many other geographic disciplines; mining and other earth-based endeavours; civil engineering and recreational uses such as hiking and orienteering.
Why are topographical maps useful?
Topographic maps are important because they accurately represent the terrain of an area. That means that they many different industries use them to understand the area they are working in.
Who uses topographic maps?
Who uses topography maps? Hikers, campers, snow skiers, city and county planners, the Fish and Wildlife Service, Forest Service, miners, loggers, highway planners and construction workers, travelers, surveyors, geologists, engineers, and scientists are just a few of the people who use topographic maps.
What is the importance of topographic maps?
Topographic maps are an important tool because they can represent the three-dimensional landscape in two dimensions. A person who can read a topo map can find out the location of peaks, valleys, ridges and saddles, among other land features.
How are topographic maps used in real life?
Uses – Topographic maps have multiple uses in the present day: any type of geographic planning or large-scale architecture; earth sciences and many other geographic disciplines; mining and other earth-based endeavours (such as planning and constructing ponds); and recreational uses such as hiking or, in particular.
What is the concept of topography?
Topography is the study of the shape and features of land surfaces. Topography in a narrow sense involves the recording of relief or terrain, the three-dimensional quality of the surface, and the identification of specific landforms. This is also known as geomorphometry.
What information does a topographic map provide?
Topographic maps usually portray both natural and manmade features. They show and name works of nature including mountains, valleys, plains, lakes, rivers, and vegetation. They also identify the principal works of man, such as roads, boundaries, transmission lines, and major buildings.