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CASANOVA
Department Of Maps
YOUR GUIDE To Modern Maps &
Navigation
Made Easy By Gene
Casanova



1:24,000scale map 
1:100,000scale map 
1:250,000scale map 
View
Land Detail 
Large Area Overview 
Region Overview 


1) 
Map Scale
The scale of a
map is the relation (ratio) between the horizontal distance
between two points measured on the ground, and the
same two
points represented on a map. This relationship is
constant, in 360dgrees of measure; as viewed on the map and
ground. 

2) 
Methods of Expressing Scale
There are two
methods of expressing the scale of a map.

Representation Fraction (RF)
(Example: Scale 1:24,000)
The
Representation Fraction method, expresses distance on a
map as a fraction of the corresponding distance on the
ground. If the map's scale is 1:100 000 (read 1 to
one hundred thousand), every distance on the map is
1/100 000th of the distance on the ground.
Example: On a map with a map scale of 1:100 000, 1
centimeter on the map represents 100 000 centimeters, or
1 kilometer, on the ground.
Note:
1) The First
Number Is Always 1. This is called the numerator.
2) The
larger the second number, the smaller the map scale and
less defined is the map detail.

Linear
Scale.
A linear scale is drawn on the map to
assist in the measurement of distance on the map.
Note:
The the zero point of the scale is located in from the
left end of the scale. With standard government
topographical maps, the scale will be in meters.
To the right of zero, the scale is graduated in primary
divisions of 2000 meters, or two kilometers. To
the left of zero, the scale is graduated in secondary
divisions of 100 meters.

3) 
Effects Of Scale



1:24,000 Scale 
1:100,000 Scale 
1:250,000 Sale 
View
Land Detail 
Area Overview 
Region Overview 
The larger
a map's scale, the more detail can be included, and the less
area can be covered within the size of the map. When
selecting a map scale, the two main considerations are the
amount of detail required, and the size of area covered. 
The Average Person And Maps
Map scales are usually confusing to the average person. It
is difficult to relate the distance on a map to the real
world when you only occasionally use a map; for instant,
occasional adventurers, tourists.
The ratio between a unit of measure on a map to some number
of the same units of measure on the earth's surface is
called the map's scale. For instance, a U.S.G.S.
topographical map with a mapscale of 1:25,000, indicates 1unit of measure on the map, represents 25,000 of the same
units of measure on the earth's surface. This means, 1inch on the map represents 25,000 inches
on the earth's surface. Same is true with larger units
of measure, such as a meter, yard or kilometer. If the
map was large enough to place a meter stick on it, then one
meter would represent 25,000 meters on the earth's surface.
Simple.
Tip: Start Thinking in meters. Meters are based on the 10 decimal system, which makes working with measurements much easier. The Universal International Standard, And Most Commonly Used MapScale Of Official Government Maps, Metric.
United States Commonly Used Map Scales
The USGS produced topographical maps in several different
scales: 1:24,000, 1:63,360, 1:100,000, and 1:250,000.
The table below is intended to show the relationship between
a distance of one centimeter on a map to actual meters on the
earth's surface. The relationship between one
inch on a map and the feet or miles that 1 inch represents
on the earth's surface is also included. Please note
the entire earth has been using the modern metric system for
a long time. It is much easier to understand and
provides a quicker method of measure than the outdated
imperial system. We highly recommend people in the
United States to start using metric scales... it makes life
so much easier.
Canada Map Scales
Topographic maps produced by 'National Resources Canada'
conform to the National Topographic System (NTS) of Canada.
They are made in two standard scales: 1/50 000 and 1/250
000.
Casanova's Quick Cross Reference
Map
Scale 
1 Cm On Map = 
1 km On Earth = On Map 
1 Inch On Map = 
1 Mile On Earth = On Map 
1:2,000 
20 m (meter/metre) 
50 cm (centimeter) 
166.67 feet 
31.68" (inches) 
1:5,000 
50 m 
20 cm 
416.67 feet 
12.67" 
1:6,000 
60 m 
16.66 cm 
500 ' 
10.56" 
1:9,000 
90 m 
11.11 cm 
750 ' 
7.04" 
1:9,600 
90 m 
10.42 cm 
0.15151515151515152 mile 
6.6" 
1:10,000 
100 m 
10 cm 
833.33' 
6.34" 
1:12,000 
120 m 
8.33 cm 
1,000' 
5.28" 
1:20,000 
200 m 
5cm 
1,666.67' 
3.17" 
1:24,000 (7.5 Minute TOPO) 
240 m 
4.17 cm 
2,000' 
2.64" 
1:25,000 
250 m 
4 cm 
2,083.33' 
2.53" 
1:31,680 
317 m 
3.16 cm 
0.5 mile 
2" 
1:50,000 
500 m 
2 cm 
0.789 mile 
1.27" 
1:62,500 
625 m 
1.60 cm 
0.986 
1.014" 
1:63,360 
634 m 
1.58 cm 
1 mile 
1" 
1:80,000 
800 m 
1.25 cm 
1.26 miles 
0.792" 
1:100,000 
1,000 m 
1 cm 
1.58 miles 
0.634" 
1:125,000 
1,250 m 
0.80 cm 
1.97 miles 
0.507" 
1:126,720 
1,267 m 
0.79 cm 
2 miles 
0.5" 
1:250,000 
1,250 m 
0.40 cm 
3.95 miles 
0.253" 
1:500,000 
1,500 m 
0.20 cm 
7.89 miles 
0.127" 
1:1,000,000 
10,000 m 
0.10 cm 
15.78 miles 
0.063" 
1:5,000,000 
15,000 m 
0.02 cm 
78.91 miles 
0.013" 
1:10,000,000 
100,000 m 
0.01 cm 
157.82 miles 
0.006" 
Ref.
//id.water.usgs.gov/reference/map_scales.html

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