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 is interpolation in contouring?
Interpolation of the contours is the process of spacing the contours proportionately between the plotted ground points established by indirect methods. The methods of interpolation are based on the assumption that the slope of ground between the two points is uniform.
How do you contour a survey?
In this method, the contours to be located are directly traced out in the ground by locating and making a number of points on each contour. These points are then surveyed and plotted on plan and the contours drawn through them.
What is a topographic model?
Topographic models consist of a scaled down version of an area of land and contours that show change in elevation. … Topographic models are most easily created directly from topographic maps that show the contours of the land, although this is not absolutely necessary.
What are the three main types of topography?
- Karst Topography. Karst topography describes the distinct landscape that is made when underlying rocks dissolve or change shape. …
- Mountain Topography. Topographical maps show landforms such as hills and mountains. …
- Vegetation, Elevation and Glaciers.
What are topographic symbols?
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.