Topographic Map Contour Lines

Contour lines are the greatest distinguishing feature of a
topographic map . Contour lines are lines drawn on a map
connecting points of equal elevation, meaning if you
physically followed a contour line, elevation would remain
constant. Contour lines show elevation and the shape of
the terrain. They're useful because they illustrate the
shape of the land surface -- its topography-- on the map.
Here's a cool way to understand how to interpret contour
lines: Take an object like a ball or a pile of laundry , and
shine a red laser pointer along the object's side. The line
you see will look like a contour line on a topographic map.
In order to keep things simple, topographic maps show
lines for certain elevations only. These lines are evenly
spaced apart. We call this spacing the contour interval. For
example, if your map uses a 10-foot contour interval, you
will see contour lines for every 10 feet (3 meters) of
elevation -- lines at 0, 10, 20, 30, 40, and so on. Different
maps use different intervals, depending on the topography.
If, for example, the general terrain is quite elevated, the
map might run at 80- to even 100-foot (24.4- to 30.5-
meter) intervals. This makes it easier to read the map --
too many contour lines would be difficult to work with.
Look in the margin of your map to find out its contour
interval.

To make topographic maps easier to read, every fifth
contour line is an index contour. Because it's impractical to
mark the elevation of every contour line on the map, the
index contour lines are the only ones labeled. The index
contours are a darker or wider brown line in comparison to
the regular contour lines. You'll see the elevations marked
on the index contour lines only. To determine elevations,
pay attention to the amount of space in between lines. If
the contours are close together, you're looking at a steep
slope. If the contours have wide spaces in between -- or
aren't there at all -- the terrain is relatively flat.

Lesson Note On Topographic Map

Reading Topographic Maps

 Interpreting the colored lines, areas, and other symbols is the first step in using topographic maps. Features are shown as points, lines, or areas, depending on their size and extent. For example, individual houses may be shown as small black squares. For larger buildings, the actual shapes are mapped. In densely built-up areas, most individual buildings are omitted and an area tint is shown. On some maps, post offices, churches, city halls, and other landmark buildings are shown within the tinted area.

The first features usually noticed on a topographic map are the area features, such as vegetation (green), water (blue), and densely built-up areas (gray or red).

Many features are shown by lines that may be straight, curved, solid, dashed, dotted, or in any combination. The colors of the lines usually indicate similar classes of information: topographic contours (brown); lakes, streams, irrigation ditches, and other hydrographic features (blue); land grids and important roads (red); and other roads and trails, railroads, boundaries, and other cultural features (black). At one time, purple was used as a revision color to show all feature changes. Currently, purple is not used in our revision program, but purple features are still present on many existing maps.

Various point symbols are used to depict features such as buildings, campgrounds, springs, water tanks, mines, survey control points, and wells. Names of places and features are shown in a color corresponding to the type of feature. Many features are identified by labels, such as “Substation” or “Golf Course.”

Topographic contours are shown in brown by lines of different widths. Each contour is a line of equal elevation; therefore, contours never cross. They show the general shape of the terrain. To help the user determine elevations, index contours are wider. Elevation values are printed in several places along these lines. The narrower intermediate and supplementary contours found between the index contours help to show more details of the land surface shape. Contours that are very close together represent steep slopes. Widely spaced contours or an absence of contours means that the ground slope is relatively level. The elevation difference between adjacent contour lines, called the contour interval, is selected to best show the general shape of the terrain. A map of a relatively flat area may have a contour interval of 10 feet or less. 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. The bathymetric contour interval may vary on each map and is explained in the map margin.