sums on scale by statement to RF (any sum)
Answers
Answer:
The Bar Scale is particularly important when enlarging or reducing maps by photocopy techniques because it changes with the map. If the Bar Scale is included in the photocopy, you will have an indication of the new scale.
C. Representative Fraction (RF) or Natural Scale:
1:1,000,000 (this is the same as 1/1,000,000)
The RF says that 1 of any measurement on the map equals 1 million of the same measurement on the original surface; for the example above 1-foot equals 1 million feet or 1 cm. equals 1,000,000 cm. This is the form of scale commonly used in the Map Collection. A good quality map should have both the RF and Bar Scales.
II. LARGE AND SMALL SCALE: when we speak of large-scale maps we are saying the RF is large, i.e. the RF's denominator is small. 1:10,000 and 1:62,500 maps are large scale. Small-scale maps have a small RF. 1:500,000 and 1:1,000,000 maps are small scale.
III. HOW TO CONVERT FROM ONE FORM OF SCALE TO ANOTHER. Often when using cartographic materials it is useful to convert from one form of scale to another. If you have a good understanding of the concept of scale, the techniques are fairly simple. Here is an example of converting from Verbal Scale to RF. Remember; the RF has the same unit of measurement on both sides of the colon.
1 inch equals 10 miles
1 inch = 10 miles
1 inch = 10 miles x 12 inches/foot x 5280 feet/mile
1 inch = 10 x 63360 inches = 633,600 inches
1:633,600
To convert from RF to Verbal Scale you convert the fraction to familiar units of measurements; for example:
1:250,000
1 inch = 250,000 inches
1 inch = 250,000 inches [d] 12 inches/foot = 20,833.3 feet
1 inch = 20,833.3 feet [d] 5280 feet/mile = 4 miles or
1 inch = 250,000 [d] 63360 inches/mile = 4 miles
1 inch equals 4 miles
[Note: [d] = divided by]
Explanation:
The Bar Scale is particularly important when enlarging or reducing maps by photocopy techniques because it changes with the map. If the Bar Scale is included in the photocopy, you will have an indication of the new scale.
C. Representative Fraction (RF) or Natural Scale:
1:1,000,000 (this is the same as 1/1,000,000)
The RF says that 1 of any measurement on the map equals 1 million of the same measurement on the original surface; for the example above 1-foot equals 1 million feet or 1 cm. equals 1,000,000 cm. This is the form of scale commonly used in the Map Collection. A good quality map should have both the RF and Bar Scales.
II. LARGE AND SMALL SCALE: when we speak of large-scale maps we are saying the RF is large, i.e. the RF's denominator is small. 1:10,000 and 1:62,500 maps are large scale. Small-scale maps have a small RF. 1:500,000 and 1:1,000,000 maps are small scale.
III. HOW TO CONVERT FROM ONE FORM OF SCALE TO ANOTHER. Often when using cartographic materials it is useful to convert from one form of scale to another. If you have a good understanding of the concept of scale, the techniques are fairly simple. Here is an example of converting from Verbal Scale to RF. Remember; the RF has the same unit of measurement on both sides of the colon.
1 inch equals 10 miles
1 inch = 10 miles
1 inch = 10 miles x 12 inches/foot x 5280 feet/mile
1 inch = 10 x 63360 inches = 633,600 inches
1:633,600
To convert from RF to Verbal Scale you convert the fraction to familiar units of measurements; for example:
1:250,000
1 inch = 250,000 inches
1 inch = 250,000 inches [d] 12 inches/foot = 20,833.3 feet
1 inch = 20,833.3 feet [d] 5280 feet/mile = 4 miles or
1 inch = 250,000 [d] 63360 inches/mile = 4 miles
1 inch equals 4 miles
[Note: [d] = divided by]