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Terms in this set (28)
The configuration or shape and roughness of the ground.
a description of a place
describing a place
"Topos" + "Graphia"
-place + description of
A process of determining the positions, on the earth's surface, of the natural and man-made features of a given locality and in determining the configuration of the terrain
A graphical portrayal of topography.
Indicate the elevations at particular points.
Consists of rows of short, nearly parallel lines whose spacing, weight and direction produce an effect similar to shading.
A line joining points of equal elevation on the map.
"Depth curves" used to portray the ground underwater.
Ridge and Stream Lining
Used to emphasize the location of high and low ground, usually used as an overlay in aerial photographs and topographic maps.
Resemble contours, but are not drawn with the same degree of accuracy.
Each elevation zone is indicated by printing a distinctive color or tone between the bounding contours.
An assumed light source from the northwest is imagined as creating areas of light and shadow in a mountainous area.
The contours are drawn as if they were illuminated by a light source from the upper-left corner of the map.
A pictorial representation of the surface, drawn from a viewpoint in space.
A representation of the terrain done in 3D to suitable horizontal and vertical scales.
are the fundamental source of terrain information on such maps.
difference in elevation between two adjoining contours.
Types of Contours:
Defined as every fifth contour (usually) in which the line thickness is made heavier than the rest.
Defined as lighter weight contours found in between index contours.
Used in areas that are so flat that the contours are far apart (to better depict the relief).
Used to show low spots
For areas where the elevations are not accurately determined.
5. use of the map
Factors Affecting the Choice of Contour Intervals:
1.Elevation Estimation - linear interpolation
2.Reservoir Capacity Estimation - volume
3.Flood-zone Maps - overflows
4.Intervisibility Between Points - profiles
Applications of Contours:
Project Control for Topographic Surveys
The reference framework should consist of two or more permanent control points and/or benchmarks located in the vicinity of the project.
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