How To Draw Contour Lines


How To Draw Contour Lines?

Part of a video titled How to Draw Contour Lines on a Map - YouTube



Once we’ve located the x’s. Then we can draw a smooth curve through all of the points. Like so andMoreOnce we’ve located the x’s. Then we can draw a smooth curve through all of the points. Like so and after we’ve drawn the contour line we need to make sure that we label it with its. Value.

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 draw a contour line by hand?

What is the formula for contour lines?

What are the 8 rules of contouring?

General Rules for Contour Lines
1. Contour lines connect points of equal elevation therefore every point along a contour line is the exact same elevation.
3. Contour lines never split or divide.
4. Contour lines always separate points of higher elevation (uphill) from lower elevation (downhill).

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What are the methods of contouring?

There are basically 2 methods of contouring – Direct Method and Indirect Method.
  • Direct Method of Contouring : High degree of precision is required for large-scale maps with small contour interval. …
  • Indirect Method of Contouring : It is suitable for undulated ground and hilly areas.

What is the contour drawing method?

contour drawing version of outline drawing in which the artist looking closely at the contour of an object transfers it in one continuous line to paper without looking down to see what he is doing except when he needs to place an internal feature such as an eye.

What is an example of a contour drawing?

What Is Contour Line Drawing? Contour line art is a method of drawing where you draw only the outline of an object without any shading. … For example if you wanted to do a contour line drawing of a pear you’d simply draw the outline of the pear add a stem and stop there.

What are the different types of contour drawings?

There are several different types of contour line drawings:
  • Blind Contour. ‘Blind contour drawing’ is when contour drawing is done without looking at the paper AT ALL. …
  • Continuous Line Contour. …
  • Modified Contour. …
  • cross-contour. …

How are contour lines drawn on maps?

Contour lines are lines drawn on a map with equal elevation points so elevation would be constant if you followed the contour line physically. The elevation and terrain shape of the contour lines shows. It is useful because they show the form of the land surface on the map–its topography.

What is contour lines in art?

A contour line defines the outline of a form as well as interior structure without the use of shading. A fundamental basis of drawing contour lines are usually the first technique children adopt to draw people houses and trees.

How do contour lines determine elevation?

You can figure out the elevation of any point by finding the nearest labeled line counting the number of lines above or below it multiplying by the contour interval and adding or subtracting the result from the nearest marked contour line. The more closely spaced the contour lines the steeper the slope.

What are the 3 factors that should be considered upon planning and designing of a contour interval to be used for a topographic map?

Contour interval on a map is decided on the following considerations:
  • 1) Scale of the map. The contour interval is kept inversely proportional to the scale of the map. …
  • 2) Purpose of the map. …
  • 3) Nature of the ground. …
  • 4) Availability of time and funds.

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Are contour lines always circular?

Contour lines always close to form a shape usually an irregular circle. Note that sometimes contour lines extend beyond the area on a map so you may not see the entire closed circle (Figure 2.16).

What is every 5th contour line called?

index contour

To make topographic maps easier to read every fifth contour line is an index contour. The index contour lines are the only ones labeled. The index contours are a darker or wider line in comparison to the regular contour lines. Elevations are marked on the index contour lines only.

What are 3 types of contour lines?

Contour lines are of three different kinds. They are the Index lines Intermediate lines and the Supplementary lines.

How do you make a contour plan?

The two ways to establish a contour map are the cross-section method and the trace contour method. To use the cross-section method set a control or reference line at the center of the lot then lay out and stake a grid the elevation is determined at each stake in the grid relative to a benchmark.

Which instrument is used for contouring?

By tachometric method- In the case of hilly area tachometric contouring method is used. Here the instrument known as tachometer which is theodolite is utilised which determine horizontal distance and elevation of the point.

What is important in contour drawing?

The purpose of contour drawing is to emphasize the mass and volume of the subject rather than the detail the focus is on the outlined shape of the subject and not the minor details. … This technique is manifested in different styles and practiced in drawing development and learning.

What are three important things to know about contour drawing?

How do you start a line drawing?

What are contour lines easy?

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. … A topographic map with contour lines connecting places that are the same height above sea level.

What do you know about contour lines?

A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.

What is interior contour drawing?

A contour drawing shows the outlines shapes and edges of a scene but omits fine detail surface texture color and tone. A contour line drawing is deliberately and slowly executed.

What is the difference between a blind contour drawing and a contour drawing?

The Difference Between a Contour Drawing and a Blind Contour Drawing. There are several types of contour drawings but blind contour line drawing is the only one that requires you to not look down at your paper and focus entirely on your subject.

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How do you draw elevation contour lines?

How do contour lines work?

Contour lines connect points that share the same elevation: Where they’re close together (they never intersect) elevation is changing rapidly in short distance and the terrain is steep. Where contour lines are wide apart elevation is changing slowly indicating a gentle slope.

How do you tell if contour lines are going up or down?

Remember contour numbering reads up hill – in other words the top of the number is uphill and the bottom is downhill. Also remember the closer contour lines are together the steeper the slope.

How is topography measured?

How to Measure Topography
  1. Measure the heights and depths of the terrain. A topographic map’s contour lines derive from regularly measured or extrapolated elevations. …
  2. Take measurements of rivers. …
  3. Classify the area’s soil and rock types.

What are the factors on which contour lines are based?

The contour interval depends upon the general topography of the terrain. In flat ground contours at small intervals are surveyed to depict the general slope of the ground whereas high hills can only be depicted with contours at larger contour interval.

How is contour level selected?

The selection of the contour interval is decided by the survey leader before the start of the mapping process depending upon the ground factors.

How do you find the contour interval?

What Is the Contour Interval Equal To? 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.

What is the elevation between 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 you read contour drawings?

How To Read Contour Lines
  1. Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. …
  2. Intermediate lines are the thinner more common lines between the index lines. …
  3. Supplementary lines appear as dotted lines indicating flatter terrain.

How to Draw Contours Lines

How to Draw Contour Lines on a Map

How to Plot CONTOURS on a SURVEY PLAN with REDUCED LEVEL(R.L.) Points/ Interpolation of CONTOURS

How to Draw Contour Lines