Two Methods of Maps
Dot method
A dot distribution map is a map type
that uses a dot symbol to show the presence, quantity or value of a feature or
variable in a specific area. Dot maps rely on a casual scatter to show
distribution pattern. TO prepare such distribution maps, area is divided into
smaller units (province, divisions, districts, tehsils or town).
According to the data, number of dots
is determined according to a scale in such a manner that number of dots should
not be too high or too low. In case of large number of dots, there may be
inadequate or little space available. On the other hand,
Fewer dots in a large unit may distort
the correct visual concept of map. Scale for dots must be set very carefully.
Before placing the dots on map, physical map of the region must be consulted to
know that where most of the dots should be placed and where the dots are not
required. This method is usually considered suitable for display of absolute
data or total amounts. Any variation in production can be estimated form the
number of dots.
Disadvantages of distribution maps
The maps showing the distribution of
the population in general are developed on the basis of the census. Most
countries of the world have a census every ten years. Sometimes people live
temporarily in a region or a country, and after some time, due to economic or
political conditions move to other countries. Therefore it becomes difficult to
show such mobile population on distribution maps. Within a country or a region,
population density (persons per square kilometer) is usually displayed with the
help of colours or shades of colour which do not provide complete information
about the region. It is difficult to differentiate between areas of dense
population through shades of colours.
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