Contents
What does a dashed line represent on a topographic map?
Supplemental Contour: A dotted or dashed line that represents half the interval between the other contour lines. Supplemental contours are used to produce a more complete picture of relief in a relatively flat area, particularly in flat areas.
What do the dashed blue lines represent?
The thin single dashed lines are trails. Maps show the outline of individual buildings and positions of structures such as radio towers. If the map depicts a large area, it might represent a densely built city as an area of pink.
What does GREY represent on a topographic map?
The first step in learning how to read a topographic map is to understand how to interpret the lines, colors and symbols. On these maps, you’ll see large expanses of green for vegetation, blue for water and gray or red for densely built up areas.
What does black horizontal line represent on a Toposheet?
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).
What two things do contour lines never do?
Contour lines never cross on a topographic map because each line represents the same elevation level of the land.
What is causing the V shape in the topographic layers?
What is causing the “V” shape in the topographic layers? Contour lines bend upstream and form a “V” when crossing a stream, river, or creek.
What are the three types of map symbols?
Map symbols are categorized into three categories: Point Symbol, Line Symbol and Area Symbol.
Where are the dashed lines on a topo map?
Finally, when the terrain is expansively flat, cartographers will often include supplementary contour lines, which are dashed lines indicating an elevation that is half of the elevation between the contour lines surrounding it. They are typically found where there is little change in elevation.
What do contour lines on a map mean?
A map with contour lines on it is called a topographic map. Topographic maps use a combination of colors, shading and contour lines to represent changes in elevation and terrain shape. Essentially, topographic maps represent the three-dimensional landscape of Earth within the two-dimensional space of a map.
What do the colors mean on a topographic map?
The color brown is used to denote most contour lines on a map, which are relief features and elevations. Topographic maps use green to denote vegetation such as woods, while blue is used to denote water features like lakes, swamps, rivers, and drainage. At higher elevations, mountains may be snow-capped year around,…
How are bathymetric contours shown on a topographic 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. Topographic Map Symbols Area exposed at mean low tide; sounding datum line*** Channel*** Sunken rock***