write the characteristic and utilities of a graphical scale.
Answers
Answer:
What is a graphic scale?
A Graphic scale also called a linear scale, bar scale, scale bar, graphic scale, or graphical scale, is a means of visually showing the scale of a map, nautical chart, engineering drawing, or architectural drawing.
On large scale maps and charts, those covering a small area, and engineering and architectural drawings, the linear scale can be very simple, a line marked at intervals to show the distance on the earth or object which the distance on the scale represents. A person using the map can use a pair of dividers (or, less precisely, two fingers) to measure a distance by comparing it to the linear scale. The length of the line on the linear scale is equal to the distance represented on the earth multiplied by the map or chart's scale.
In most projections, scale varies with latitude, so on small scale maps, covering large areas and a wide range of latitudes, the linear scale must show the scale for the range of latitudes covered by the map. One of these is shown below.
Since most nautical charts are constructed using the Mercator projection whose scale varies substantially with latitude, linear scales are not used on charts with scales smaller than approximately 1/80,000.[1][2] Mariners generally use the nautical mile, which, because a nautical mile is approximately equal to a minute of latitude, can be measured against the latitude scale at the sides of the chart.
While linear scales are used on architectural and engineering drawings, particularly those that are drawn after the subject has been built, many such drawings do not have a linear scale and are marked "Do Not Scale Drawing" in recognition of the fact that paper size changes with environmental changes and only dimensions that are specifically shown on the drawing can be used reliably in precise manufacturing.
Explanation:
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Answer:
when the map distance and the corresponding ground distance are show with the help of a line , it is called a graphical scale. Graphical scale is also known as linear scale .
Explanation:
For example , if the statement scale of a map is 1 cm =250 km , then a straight line measuring a length of 4 cm on paper will represent a distance of 1,000 km on the ground.
The main characteristics and utilities of this method of mapmarking or map reading are :1.Grapical scale is always expressed with the help of a horizontal line or a bar. 2. The line or bar does not have any specific length .But normally it's length is kept between 8 cm and 15 cm.