A linear scale showing that one centimetre on the map corresponds to six kilometres
Linear scale in both feet and metres in the center of an engineering drawing. The drawing was made 130 years after the bridge was built.
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.[3]
The scale from a large world map, showing, graphically, the change of scale with latitude. Each unit on the map at the equator represents the same distance on the earth as 5.9 units at 80° latitude.
Nomenclature
An architectural drawing with a simple linear scale showing feet and half feet.
The terms "bar scale", "graphic scale", "graphical scale", "linear scale", and "scale" are all used. Bowditch defined only "bar scale" in its 1962 Glossary,[4] but added a reference to "graphic scale" by its 2002 edition.[5] Dutton used both terms in 1978.[2] The International Hydrographic Organization's Chart No. 1 uses only "linear scale".[6] The British Admiralty'sMariner's Handbook uses "scale" to describe a linear scale and avoids confusion by using "natural scale" for the fraction defined at scale (map).[7]
Logarithmic scale (useful e.g. when the data covers a large range of values)
References
^Bowditch, Nathaniel, LLD; et al. (PDF) (2002 ed.). Washington: National Imagery and Mapping Agency. pp. 34–35. Archived from the original (PDF) on 2012-03-15. Retrieved 2010-11-16.
^ abMaloney, Elbert S. (1978). Dutton's Navigation & Piloting (13th ed.). Annapolis: Naval Institute Press. pp. 52–3.
^Do a web search on "Do not scale drawing" to see many examples.
^Bowditch, Nathaniel, LLD; et al. "Glossary". The American Practical Navigator (1962 ed.). Washington: U.S. Navy Hydrographic Office.
^Bowditch, Nathaniel, LLD; et al. "Glossary". (PDF) (2002 ed.). Washington: National Imagery and Mapping Agency. Archived from the original (PDF) on 2017-05-17. Retrieved 2010-11-16.
^Chart No. 1, Chart Number, Title, Marginal Notes. Jointly by NOAA and Department of Commerce, USA. The cited book incorporates IHO Chart INT 1 and therefore represents the practice of the members of the IHO, most of the seafaring nations.
^Lt. Cmdr. C.J. de C. Scott, R.N., ed. (1973). The Mariner's Handbook. Taunton: The Hydrographer of the Navy. p. 33.
February 05, 2023
linear, scale, this, article, about, graphical, representation, mathematical, scale, scale, other, uses, scale, linear, scale, also, called, scale, scale, graphic, scale, graphical, scale, means, visually, showing, scale, nautical, chart, engineering, drawing,. This article is about the graphical representation For a map mathematical scale see Scale map For other uses see Scale A linear scale also called a 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 A scale bar is common element of map layouts A linear scale showing that one centimetre on the map corresponds to six kilometres Linear scale in both feet and metres in the center of an engineering drawing The drawing was made 130 years after the bridge was built 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 3 The scale from a large world map showing graphically the change of scale with latitude Each unit on the map at the equator represents the same distance on the earth as 5 9 units at 80 latitude Nomenclature Edit An architectural drawing with a simple linear scale showing feet and half feet The terms bar scale graphic scale graphical scale linear scale and scale are all used Bowditch defined only bar scale in its 1962 Glossary 4 but added a reference to graphic scale by its 2002 edition 5 Dutton used both terms in 1978 2 The International Hydrographic Organization s Chart No 1 uses only linear scale 6 The British Admiralty s Mariner s Handbook uses scale to describe a linear scale and avoids confusion by using natural scale for the fraction defined at scale map 7 See also EditEngineer s scale Logarithmic scale useful e g when the data covers a large range of values References Edit Bowditch Nathaniel LLD et al The American Practical Navigator PDF 2002 ed Washington National Imagery and Mapping Agency pp 34 35 Archived from the original PDF on 2012 03 15 Retrieved 2010 11 16 a b Maloney Elbert S 1978 Dutton s Navigation amp Piloting 13th ed Annapolis Naval Institute Press pp 52 3 Do a web search on Do not scale drawing to see many examples Bowditch Nathaniel LLD et al Glossary The American Practical Navigator 1962 ed Washington U S Navy Hydrographic Office Bowditch Nathaniel LLD et al Glossary The American Practical Navigator PDF 2002 ed Washington National Imagery and Mapping Agency Archived from the original PDF on 2017 05 17 Retrieved 2010 11 16 Chart No 1 Chart Number Title Marginal Notes Jointly by NOAA and Department of Commerce USA The cited book incorporates IHO Chart INT 1 and therefore represents the practice of the members of the IHO most of the seafaring nations Lt Cmdr C J de C Scott R N ed 1973 The Mariner s Handbook Taunton The Hydrographer of the Navy p 33 Retrieved from https en wikipedia org w index php title Linear scale amp oldid 1134192083, wikipedia, wiki, book, books, library,
