How do you read contour lines on a plan?
How To Read Contour Lines Index lines are the thickest contour lines and are usually labeled with a number at one point along the line . Intermediate lines are the thinner, more common, lines between the index lines . Supplementary lines appear as dotted lines , indicating flatter terrain.
What do the numbers on contour lines mean?
The vertical interval is the height (elevation) between each contour and they appear 5 or 10 metres apart with thicker lines every 50 metres. The numbers on contour lines are always displayed in ascending height, so if the numbers increase it denotes an uphill slope, and if they decrease it’s a downhill slope.
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.
How do you calculate contour lines?
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.
How do you read a plot plan?
Tips on How to Read a Site Plan Find The Title Block. In the bottom right corner of most plans , you’ll find what’s called a title block. Learn the Plan’s Scale. Determine the Orientation of the Plan . Know the Datum Point. Note the Site’s Contours. Locate Existing Structures.
What is the space between contour lines called?
The space between the contour lines is called the contour interval and represents a specific (set) distance . If the contour interval is 50 feet, the vertical space between the two contour lines is 50 feet.
What is the difference between two contour lines?
The elevation difference between two adjacent contour lines is called the contour interval (CI). Usually the contour interval is noted on the map legend. In most topographic maps every 5th contour line is drawn in bold print or wider than other contours .
How do we use contour lines?
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 .
What can contour lines never do?
Contour lines never cross on a topographic map because each line represents the same elevation level of the land.
What are the basic features of contour lines?
Characteristics of Contours Must close on themselves, on or off the map. Perpendicular to the direction of max. Slope between them is assumed uniform. The distance between them indicates the steepness of the slope, gentle or steep. Irregular signify rough, smooth signify gradual slopes. Concentric closed contours : hills or depression.
How do you teach contour lines?
Here are some of my tried and true tips to teach contour line at any age! Using whiteboards, give students an an opportunity to practice. Start with objects that are simple and familiar. Provide a variety of real-life examples. Show examples of contour line in real pieces of artwork.
Can Google maps show contour lines?
However, Google Maps doesn’t show elevation by default, and only shows elevation in mountainous areas — it doesn’t report elevation everywhere, especially in cities or other areas that lack naturally elevated grounds.
Can Google Earth show contour lines?
Frank Taylor, Google Earth Blog reported that New Contour Lines in Google Maps . Google has announced a new feature to the terrain relief maps they added last November to Google Maps . Now when you zoom in closer, the terrain shows contour lines to give you an even better feel for the lay of the land.