How Do You Read A Contour Plot?

What is the definition of contour line?

Contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level..

What is the importance of contour lines?

The purpose of contour lines is to represent the tridimensional shape of the terrestrial surface on a bidimensional map. Contour lines are the intersection of an horizontal plane parallel to the reference level and the topographical surface to describe. Consequently: Contour lines are always closed curves.

What is contour curve?

A contour line (also isoline, isopleth, or isarithm) of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value. It is a plane section of the three-dimensional graph of the function f(x, y) parallel to the (x, y)-plane.

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 are the basic features of contour lines?

Other characteristics of contour lines are: – Horizontal distance between contour lines is inversely proportional to slope. – Uniform slopes have uniformly spaced lines. – Along plane surfaces, contour lines are straight and parallel. – Contour lines are perpendicular to lines of steepest slopes.

Why can’t contour lines cross?

Contour lines can never cross one another. Each line represents a separate elevation, and you can’t have two different elevations at the same point. … Moving from one contour line to another always indicates a change in elevation.

How do you do a contour plot in Excel?

How to Create a Contour Plot / Surface Charts in Excel? (Step by Step)Step 1: Select the data in the excel worksheet.Step 3: Go to Insert >>> Charts >>> Stock, Surface or Radar Chart.Step 4: Once you click on Stock, Surface, or Radar Chart, we can see below the preview. … Step 5: Now, we will have the below chart.More items…

How do you describe a contour plot?

Contour plots (sometimes called Level Plots) are a way to show a three-dimensional surface on a two-dimensional plane. It graphs two predictor variables X Y on the y-axis and a response variable Z as contours. These contours are sometimes called z-slices or iso-response values.

How do you read a contour plan?

How To Read Contour LinesIndex 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.

How do you read a contour plot in Minitab?

Use a contour plot to see how fitted response values relate to two continuous variables based on a model equation. A contour plot provides a two-dimensional view in which all points that have the same response are connected to produce contour lines of constant responses.

What is contour plot in Matlab?

contour( Z ) creates a contour plot containing the isolines of matrix Z , where Z contains height values on the x-y plane. MATLAB® automatically selects the contour lines to display. … To draw the contour lines at specific heights, specify levels as a vector of monotonically increasing values.

What is the space between contour lines called?

Contour lines–usually curved, parallel brown lines–show the shape and elevation of the land by connecting points of equal elevation. … The space between the contour lines is called the contour interval and represents a specific (set) distance.

What is the shape of contour lines?

Contour lines never split. Instead, contours form closed loops. These loops follow the shape of the land, and may extend past the edge of the map. Closely spaced contours indicate a steep slope, whereas contours that are spaced far apart indicate a gentle slope or almost flat surface.