How To Calculate Representative Fraction Map Scale Pdf



The proportion in usage of minimization actual lengths is the scale of map. The most common large scale models are homogeneous, drift-flux and two-fluid models. This sample is NOT, however, all-inclusive. For every 10 kilometers in. 8 These large-scale “solar farms” are connected to transmission systems, which transmit the power to electrical substations. a fraction written in base ten numeration. Convert the following REPRESENTATIVE FRACTION scales into DIRECT. Representative Fractions A scale can be give as a ratio e. Search the world's information, including webpages, images, videos and more. Learn to use scale factor to find actual dimensions from scale models, drawings or maps. Moreover, MR images were converted to “Analyze” format by using software (Matlab, version 7. Measuring map scale distortion – scale factor & principal (nominal) scale. Enter quantity and item unit and this calculator shows the work on how to solve for the unit rate. The probability density function (PDF) of a random variable, X, allows you to calculate the probability of an event, as follows: For continuous distributions, the probability that X has values in an interval (a, b) is precisely the area under its PDF in the interval (a, b). 2) A similar formula for converting Bar Scale to RF Scale in English units looks like this: step 1: step 2: where: RF - Representative Fraction Scale of the map, A (inches) - actual distance - a number of inches on the ground surface, represented by 1 inch (or 1") on a map, B (miles) - value of one small incriment of a Bar Scale,. On a map, the legend might tell us one inch is equivalent to 50 miles or we might notice one hand has five fingers. Linear Conversions. - Scale is a fraction, expressed in 3 ways: - Representative Fraction (RF), e. capacity is the result of utility-scale solar plants, which are large installations owned and operated by a utility, usually ranging from a few megawatts (MW) to hundreds of megawatts in size. Map Scale Exercises - Free download as PDF File (. When both values in a ratio have the same unit or designator, there should be no unit or designator on the reduced form of the ratio. calculated the fraction of articles assigned to E1, multiplied this fraction by the quarterly rate E=U, and normalized the resulting index to 100 over the 2000-09 period. 1:100,000 - Verbal Scale 'One cm represents one km' - Graphic Scale - a line labelled with the distance it represents. 5 ft: which is analogous to a representative fraction of 1:2400. The analysis of Monte Carlo simulation results provides many im-. denominators, e. I have this PDF image of a map with a scale of 1:300. com) Agribotix LLC, 3309 Airport Road, Boulder, CO 80301 USA Abstract Agribotix conducted a post hoc test of two vegetation indices, VARI and TGI, that used only the three. Building plans aren't drawn to size, they are drawn to scale, which means that you "shrink" the area down and make a scale model on paper. However in the digital map world, this traditional concept of scale does not exist. These problems involve multiplication or require you to simplify fractions. pdf), Text File (. gov/retail/mrts/www/ data/pdf/ec_current. Just pay for shipping and handling (typically $9. Hardcopy-paper c. In the examples below: • One inch equals one mile therefore, one inch equals 62,500 inches on the map; that in turn equals one mile in the real world. The sample quiz that follows is a reasonably representative example of what you might can expect in terms of content for the Lab 01 Quiz. Converting Between Scale Types of Historic and Modern Maps, page 3 Converting Lexical Scale to Representative Fraction (RF)/Ratio Scale English and Metric Measures of Length to use: 1 inch (in) = 2. Enlarging a map by 200% means to make the enlarged map two times bigger than the original map. The scale generally used in architectural drawings, for example, is 14 inch to one foot, which means that 14 of an inch on the drawing equals one foot on the building being drawn. Enlarging a map by 200% means to make the enlarged map two times bigger than the original map. 50,000 actual inches divided by 12in gives 4166. Map scale would best be defined as a tool to Reveal the relationship between features on a map and corresponding features on Earth. That's it !. Map Scale and Distance Calculator. (It could also be shown as l/50 000, but this form is not as common. Map scales, directions, and symbols Map scales The scales printed on a map permit the determination of ground distance. Mental-maps contained in human memory b. For example, many USGS topographic maps have a scale of 1:24,000. to calculate the specific energy and specific power for any given set of input variables. See Table 2. The proportion, or ratio, is also typically expressed in the form 1 : D g rather than 1 / D g. For instance a town plan, which is a large-scale map, might be on a scale of 1:10,000, whereas the world map, which is a small scale map, might be on a scale of 1:100,000,000. (Major Cluster) Don’t sort clusters from Major to Supporting, and then teach them in that order. Open folder - can be used to access PDF files Print – will be used to print Show/Hide Navigation Pane – can be used to show or hide the bookmark/thumbnails. This means that journey distances can be accurately calculated. In fact, on some maps, you will see the RF represented using a division sign. Representative Fraction (R. The scales are often. The convective precipitation fraction is always assumed to be 0. " Because an R. developed codes also calculate time series of rainfall accumulation and present these accumulations on the same 500 m by 500 m grid. then i should to calculate the area in the unit cm. What is the approximate scale of the photo? 6. I was never into math, but this year I am really afraid that I won't be able to finish this course. (A) Convert the following representative fractions into a word statement: (show your work) Express the scale of a large-scale map with a RF of 1:50,000 (1 inch to x feet) 1 inch on the map equals 50,000 actual inches. The analysis of Monte Carlo simulation results provides many im-. Using linear scale factor a shape can be transformed into another similar shape by changing the size of all its dimensions (either enlargement or reduction) by using a scale factor. Socials 8 June Exam What to Study. To find the ground distance in the real world, I must use the map's Rate scale to convert map distance to ground distance. Map scales, directions, and symbols Map scales The scales printed on a map permit the determination of ground distance. This is the unique advantage of the graphical method of the map scale. The names are for simplicity and are not representative of the entire mineralogy of each endmember. This is an online scale length converter that calculates the actual length and the scale length according to the scale ratio. In the above example, 1 unit on the map stands for 250000 units on the ground. Conversely, you can use the side lengths of two similar figures to calculate the scale factor. The scale on a map is 7 centimeters for every 10 kilometers, or 7 centimeters for 10 kilometers. WorldView-2 accuracy per-. Verbal and RF scales do not. (J) Representative APD map of control, CDC, and PBS rats. International Journal of Remote Sensing, 18: 3145 – 3166. There are two interpretations of scale statements. The distance between two features on a photo is 11. " Because an R. scale ratio could be set by yourself, supports different length units, including imperial units and metric units. pdf) reports that e-commerce sales in the United States reached $5. Assume the simple graphic scale below is 1" long. • AVernier scale consists of (i) a primary scale and (ii) a vernier. For example, the fraction 375 / 1000 = 0. This reduced fraction is the ratio's expression in simplest fractional form. Thus 1cm to 500 m can be written as 1:50000. For example: Strahan to Queenstown Map distance is 1. Such maps are called large scale because the representative fraction is relatively large. 0 Human Receptor Data 1 A setting is defined for each unique WMU type/site combination. , by using visual fraction models and equations to represent the problem. Creating probability trend models for facies properties. The minimization rate and the denominator of fraction are equal. The scale on topographic maps is presented as both a representative fraction, such as 1:24,000 − a common scale for many topographic maps in the US, and as a graphic (Figure 1). 9 Next, we entered for each country an estimate of its ‘inshore fishing area’ (IFA), defined as the area of its shelf (and within its exclusive economic zone) ranging from the shoreline to 50 km offshore or 200 m depth, whichever comes first, based on a. Reteaching 87 • Scale Drawing Word Problems The scale of a drawing or model is a ratio relating lengths on the drawing or model to lengths on the actual object. 5 km d) 1 cm = 5 km e) 1 cm = 10 km 2. MapTools can now make you a customized map ruler for any scale map. See Section 2 for additional information on the 419 settings used in this analy. pdf), Text File (. Projects aim to strengthen regional capacities to uphold democracy, transform and prevent conflicts, and improve governance. ) 3 A large-scale map covers a small area, but can give detailed information. This is the unique advantage of the graphical method of the map scale. 1:100,000 - Verbal Scale 'One cm represents one km' - Graphic Scale - a line labelled with the distance it represents. The second column TD of Greatest Eclipse is the Terrestrial Dynamical Time of greatest eclipse. Global estimates of small-scale marine fisheries catches, Chuenpagdee, R. - Scale is a fraction, expressed in 3 ways: - Representative Fraction (RF), e. scale-up factor equation was developed to adjust the lab rates to values representative of field conditions. Ocean currents are set in motion by prevailing winds. CAPCOA Air Toxics Hot Spots Program Revised 1992 Risk Assessment Guidelines. 1) Please calculate and write down the scale of this map. scale is a ratio, or fraction, that expresses the mathematical relationship between MAP and LAND, such as 1 : 24,000. Remember, the questions are drawn randomly from a pool. The sample quiz that follows is a reasonably representative example of what you might can expect in terms of content for the Lab 01 Quiz. , which is good, because the metric system is so much easier for map scales because converting units is all a matter of zeroes. Be careful to use the correct units of measure. 1:1,000,000 (this is the same as 1/1,000,000). For platform weighing, moving vehicles often increase scale weight readings, and the allowable weight is increased slightly. The advantage of this distinction between varying scale on the super map and a constant RF is that for the former we can analyse scale variation around a value of unity. Watts and the late W. Representative Fraction: A method of scale of a map or plan expressed as a fraction showing the ratio between a unit distance on the map or plan, and the distance measured in the same units on the ground. Map scales, directions, and symbols Map scales The scales printed on a map permit the determination of ground distance. In the ATB, CAPEX represents a typical one-axis utility-scale PV plant and does not vary with resource. - Scale is a fraction, expressed in 3 ways: - Representative Fraction (RF), e. These are representative fraction, scale statement and graphic or bar scale. Make a paper popup sundial first, to test alignment and see how the full scale sundial will look and fit. If you will be requesting (or have been approved for) the accommodation of Assistive Technology Compatible format (digital testing for use with a screen reader or other assistive technology) for the SAT, you may wish to also review the math sample items in their fully formatted versions which are sorted as questions that permit the use of a calculator and questions that do not permit the use. • AVernier scale consists of (i) a primary scale and (ii) a vernier. Scale Conversion Calculator - Convert Measurements to a Scaled Size Scale a measurement to a larger or smaller measurement, which is useful for architecture, modelling, and other projects. This is a quick and easy tracking feature you can learn in just a few minutes. This reduced fraction is the ratio's expression in simplest fractional form. Hit Calculate Scale to calculate the scale. SO,OOO cm = SOO m or km. In the patient, fatty infiltration of muscles is greatest in the quadriceps (red region of interest), which also has a reduced CSA. ACCURACY OF WORLDVIEW PRODUCTS. A scale is usually written as a fraction and is called the representative fraction. The sample quiz that follows is a reasonably representative example of what you might can expect in terms of content for the Lab 01 Quiz. It shows the relationship between the map distance and the. The model yields empirically realistic distributions of wealth and marginal propensities to consume because of two fea-. Start with the ratio scale. can you help me,how can i detect the irregular shape in the image automatic and how can i calculate that irregular shape area. Calculate the angular diameter: degrees Method 2. Such maps are called large scale because the representative fraction is relatively large. 1 Representative fraction. (It could also be shown as l/50 000, but this form is not as common. pdf), Text File (. The scale on the topo map is found at the bottom center of the map. WP-ACCURACY 5/16 7. ) 3 A large-scale map covers a small area, but can give detailed information. California Air Pollution Control Officers Association, October 1993. It can be written in three ways, the verbal scale, the graphic scale, and the representative fraction (RF) or fractional scale. The extent of this reduction is expressed as the map's scale. In the example, divide 232 by 8 to calculate a scale factor of 29. • The primary scale is a plain scale fully divided in to minor divisions. The ACT Aspire Assessment System® is a vertically. pdf) reports that e-commerce sales in the United States reached $5. Representative Fraction: A method of scale of a map or plan expressed as a fraction showing the ratio between a unit distance on the map or plan, and the distance measured in the same units on the ground. Find the actual distance between the two points in km. MapTools produces grids, corner rulers, roamers, and rulers to assist with plotting or measuring positions on many different map scales. When a representative fraction expresses a very small ratio, for example 1:1000 000, it is called a small scale map. Here are several examples: Scale Finder (Nigel James, Bodleian Library, Map Room). (C) Fat-fraction maps of the right thigh in a healthy control and a patient with IBM. RORγ expression increased with progression, and its blockade via genetic or pharmacologic approaches depleted the cancer stem cell pool and profoundly inhibited human and mouse tumor propagation, in part by suppressing a super-enhancer-associated oncogenic network. Demonstrate competency with multiplying fractions. Lunar Eclipses: 2021 - 2030 Fred Espenak. (Return to Checklist (ST)). Creating probability trend models for facies properties. TP-7A40-56437-1. In this worksheet, your child must think about what scale would work best for different types of maps. You can write down the scale in the format of either verbal scale or Representative Fraction Scale. focal length is equal to 0. For example, a systematic sample is to be selected from 1,200 students at a school. a fraction written in base ten numeration. fraction, and/or by using properties of operations and the relationship between addition and subtraction. These scales may be Plain scales or Diagonal scales Also construct a comparative scale to read kilometersand may be constructed separately or one above the other. This permitted reduction of time to calculate the MFF to less than 2 minutes. The scale on the topo map is found at the bottom center of the map. Graphic scale remains accurate if a map is enlarged or reduced. It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes. 0 Human Receptor Data 1 A setting is defined for each unique WMU type/site combination. ground elevation, the engineers' scale of the photograph is: which translates to an engineers' scale of 1 in. Calculate the volume of right rectangular prisms using the volume formula (V = lwh) with whole number edge lengths. It shows the relationship between the map distance and the. Use the representative fraction scale shown on the map to calculate the distance in kilometres. Types of Scales Civil Engineering Scale. For the best answers, search on this site https://shorturl. An example: on a map with the scale 1:20000, 3 centimeters accord to 0. You can also use this calculator to compare mixed numbers and improper fractions. For these problems, kids are given a simple fraction and asked to draw a pie chart representation of the value completely independently; unlike the worksheets from the prior section, these worksheets do not include the pre-divided fraction shapes as hints. There are three ways of expressing map scales: 1. Geoscientists use radiocarbon, or carbon-14, to establish a chronology of Earth's processes. Stock Tools. Here we reimplement this approach using 100 of the 11,038 scaffolds in the draft genome. This graphical representation is called an air photo index map, and it allows you to relate the photos to their geographical location. The difference in cost between tracking and non-tracking systems has been reduced greatly in the United States. Place cursor on toolbar icon. A large scale map will display a small portion of the earth’s surface in great detail whereas a small scale map will show a large portion of the earth’s surface (even the whole surface) in very limited detail. Examples of Image Analysis Using ImageJ (continued) Particle Counting and Analysis. it is unknown, but ground distances are available. The sampling interval is therefore 12. Using a computer and image processing software All the digital images created by the MicroObservatory Telescopes are composed of a grid of 650x500 "pixels," or picture elements, each of which correspond to a fraction of a degree in the field of view. Representative fractions calculate distances more accurately than written scales. The global diversity of Bacteria and Archaea, the most ancient and most widespread forms of life on Earth, is a subject of intense controversy. Distance is measured on a map using a variety of scales. Calculating Scale on Top Maps 1. Maps that cover small area are called large-scale maps. a fraction written in base ten numeration. In old maps where the lengths of measurement are not statute miles these can be hard to calculate. For example: 1/4" = 1" Invert the fraction and multiply by 12 to get: 4/1 x 12 = 48. Applied Mathematics Standards- Level 7 6 Investigative SP. Geography Exploration: An Introduction to Map Scale using Google Earth 1 To represent geographic features on a map, the features must be reduced in size. In this worksheet, your child must think about what scale would work best for different types of maps. Handy calculators are available online. This is an online scale length converter that calculates the actual length and the scale length according to the scale ratio. Maps that show a large geographic area in comparison to the relative size of the map are known as small scale maps. They draw a garden using grid paper and label each section with the correct fraction and decimal to the tenths. Understand that, just as with simple events, the probability of a compound event is the fraction of outcomes in the sample space for. It shows the relationship between the map distance and the. This means that one inch on the map represents 24,000 inches in the real world. 3 Large scale vs. Multiply your distance by the scale number. of the scale for this map and draw a diagonal scale to show kilometers, hectametres and decameters and to measure upto 5 kilometres. Comparing RGB-Based Vegetation Indices With NDVI For Drone Based Agricultural Sensing Tom McKinnon (tom. In the patient, fatty infiltration of muscles is greatest in the quadriceps (red region of interest), which also has a reduced CSA. Use the representative fraction, or ratio, of the map to find the ground distance based on your measurement on the map. com customer you will receive a FREE 5 lb. But how can the brain reliably produce this particular combination?. Graphic scales, also know as bar scales, as indicated by the name, show the scale graphically. Converting Ratio and Linear Scales - Skc 12 Geography with Lockie at Saint Kentigern College - StudyBlue Flashcards. 5 billion in the fourth quarter of 2012. CAPCOA, 1993. • AVernier scale consists of (i) a primary scale and (ii) a vernier. 0 cm (ii) 22. -A rate is a ratio of two quantities of different units, for example, in expressing how. Whether you are designing a new house or designing a new deck, one of the first steps is to create a building plan. Lunar Eclipses: 2021 - 2030 Fred Espenak. Between 1960 and 1995, the official poverty rate of those aged 65 and above fell from 35 percent to 10 percent, and research has documented similarly steep declines dating back to at least 1939. Absolute scales are often referred to as ratios or representative fractions. Interpret how multiplying by a fraction greater or less than 1 affects the product. The sample quiz that follows is a reasonably representative example of what you might can expect in terms of content for the Lab 01 Quiz. Why should you care what the scale of the map is? The scale helps you understand how far you'll have to hike to get to that lake, or the distance between two points on a road. Distance and Direction on Maps. of resolution of the map of Wada et al. This graphical representation is called an air photo index map, and it allows you to relate the photos to their geographical location. The concept of scale, the representative fraction in particular, was clearly not understood. Faster than a calculator | Arthur Scale and Representative Fraction. 1 The purpose of map scale 1. being obviously at the same scale, because the question said it was at half the scale. Inches fraction chart math inch to fraction conversion chart o view topic fraction to decimal conversion chart tips in conversation decimal conversion mathpapa algebra. In the two years after the end of the most recent recession (Q2:2009), existing home sales rose only 4 percent, house prices fell by 4 percent, according to the CoreLogic price index, and residential investment averaged only 2-1/2 percent of gross domestic product (GDP)--half of the average GDP between 1949 and 2006. (viii) Juvenile water is also referred as underground water. !A map has a scale of 1cm : 3 miles. 5 The scale helps us calculate the actual distance between two. Also, with examples mistakes in scaling and correction are explained. Photo RF = (Photo Measurement/Map Measurement)* Map RF. The golden ratio (symbol is the Greek letter "phi" shown at left) is a special number approximately equal to 1. According to the Intergovernmental Committee on Surveying and Mapping, scale defines a mathematical relationship between a map's size and the size of the. Quantifying Forest Structure at Multiple Scales Introduction The behaviour of the terrestrial biosphere will play a critical role in the future of the global carbon bal - ance, as terrestrial vegation absorbs a significant fraction of carbon dioxide emitted to the atmo-sphere through human activities including landuse. Census Bureau to add data layers to a map that shows residents' education levels, ages, and employment status. Scale Finder 7 converts nearly over 180 distance units - both current and historical. The scale factor is used to solve geometric problems. In addition to the statistical analysis uses, standard deviation can also be used to determine the amount of risk and volatility associated with a particular investment. They are developed to obtain a representative value of the velocity and the pressure in a given region. carries no units (inches, centimeters, etc. Whoops! There was a problem previewing Map Scales. These are representative fraction, scale statement and graphic or bar scale. "On this map the scale is given as a representative fraction (1/253,440) and also as a ratio (1:253,440). Find the R. • AVernier scale consists of (i) a primary scale and (ii) a vernier. TEACHER GUIDE: STUDENTS CALCULATE SCALE DIMENSIONS ON MAP CALCULATING SCALE DISTANCES: This provides an excellent opportunity to use some fairly basic algebra to show how a “scale factor” is derived from a simple scale equation. decreased dramatically during the twentieth century. As with scale bars, this map element should be subtle and it should not draw the attention of the map reader – again, they should have to shift their attention in order to find it on the page. Cabarrus County Schools 7th Mathematics Year-Long Curriculum Map Click here to access the Preamble for 7th Grade Math. This fraction is called the representative fraction or simply "RF" in short. Multi-variate probability density functions with dynamics (MVD PDFs) are a potential solution to the problem of the gap between the resolution of climate models and the scales relevant for aerosol activation. ( i ) The distance between two towns measures 6cm on a map. Small angle scattering and asphaltenes S2489 density of the particles. • AVernier scale consists of (i) a primary scale and (ii) a vernier. The blue curve below the target is the film MTF, expressed in percentage-- the scale on the left applies. An example of a graphic scale is "1 cm to 2,000 ft," indicating that one map centimeter represents 2,000 feet on the Earth's surface. Fractions consist of sets of numbers in which the top number (numerator) illustrates a part that is related to the whole unit, which is represented by the bottom number (denominator). Thus 1cm to 500 m can be written as 1:50000. Identify that v = l w h is the same as v = Bh and can be used interchangeably. The lowest frequency portion of the electromagnetic spectrum is designated as “radio,” generally considered to have wavelengths within 1 millimeter to 100 kilometers or frequencies within 300 GHz to 3 kHz. Maps are always smaller than the area of the ground they represent. )² 12 Scale Scale 63360 0. If the bar scale is included in the photocopy, you will have an indication of the new scale. In this case, objects on the map are small compared to the real-life continent. An absolute scale is a scale that is unitless ratio that indicates how condensed a map is; how many units of the actual surface of the earth is represented by one unit on the map, eg. The proportion chosen for a particular map is its scale. For example, if you have the fraction 5/10, you can convert this to the ratio of 5:10. The verbal scaleis a simple statement of the scale such as one inch equals one mile or 1" = 1 mile. Photo RF = (Photo Measurement/Map Measurement)* Map RF. How to use the scale ruler. A word statement that states the conversion of base units and is also a description of a map distance 3. Hardcopy-paper c. Agilent delivers complete scientific solutions, helping customers achieve superior outcomes in their labs, clinics, business and the world they seek to improve. pdf - Socials June Exam Geography Scale definition/line/statement/representative fraction(ratio large and small. The statistical data for Israel are supplied by and under the responsibility of the relevant Israeli authorities. Map scales are used to help people determine distances, even when the map is rather small in size. Leaching fraction is often done by collecting the volume of irrigation and leachate. Use the representative fraction, or ratio, of the map to find the ground distance based on your measurement on the map. Various candidate representative models were considered by the TI team, with preference given to an. Faster than a calculator | Arthur Scale and Representative Fraction. The confidence interval (also called margin of error) is the plus-or-minus figure usually reported in newspaper or television opinion poll results. Write a "1:" in front of the scale factor to present it as a ratio. Search the world's information, including webpages, images, videos and more. For example, if a photo has a scale of 1/2 inch to five miles (verbal statement), this is the same as 1 inch to ten miles. On a certain map we have two towns that measure 5 inches apart. What number (representing miles) should be written at the right end? 2. You can also use this calculator to compare mixed numbers and improper fractions. The bar scale is particularly important when enlarging or reducing maps by photocopy techniques because it changes with the map. Examples of large scale maps are cadastral map. Reducing a 1:30,00 scale map to 50% of its orginial size changes the RF scale to 1:60,000. Sample size needs to be determined efficiently in order to obtain meaningful research insights. 7 million in 2018, was little changed from 2017. A distance of 1 cm on the map may represent an actual distance of 500 m. However, if certain pieces of information are present, the scale can be "obtained" by using logic. There is no hard and fast dividing line between small and large scales. Polygon Q's area is what fraction of Polygon P's area? Pause this video and see if you can figure that out. [email protected] The first choice on this dialog, "Absolute Scale", is a representative fraction (figure 3). , time-of-day) and rule-based mechanisms to attempt to automate this matching between computing requirements and computing resources. These "representative fraction" scales mean that 1 unit of measurement on the map—1 inch or 1 centimeter—represents 10,000 of the same units on the ground. indd 22 27/10/11 10:25 AM. Also, with examples mistakes in scaling and correction are explained. I have this PDF image of a map with a scale of 1:300. If the distance between two cities is 60 kilometers-- so that's the actual distance-- how far apart in centimeters are the two cities on the map? Well, they give us the scale. This unit can be in centimetres, inches, metres etc. As an example on a 1: 1000000 cm scale map shows that 1 centimeter is equal to 1 kilometer on the ground. David Márquez. Hilborn and Walters (1992) warn against using length-based methods, and note that length compositions are often not representative of the whole stock. Representative fraction (RF) or natural scale. Leaching fraction is the amount of water drained divided by the amount applied. The second column TD of Greatest Eclipse is the Terrestrial Dynamical Time of greatest eclipse. It is a ratio that could represent any unit of measurement and this ratio is called the Representative Fraction (RF). This enters the scale into the lower Measure at Scale dialog. The bar scale is particularly important when enlarging or reducing maps by photocopy techniques because it changes with the map. Map information a. The size, by which actual distances on the ground have been shrunk to draw proportionate maps, is known as the scale of the map. This is an online scale length converter that calculates the actual length and the scale length according to the scale ratio. Why should you care what the scale of the map is? The scale helps you understand how far you'll have to hike to get to that lake, or the distance between two points on a road.