Plans & maps:
What is the
difference between plan and map?
Plan:
> Plan is a graphical
representation ofthe feature on or below the surface ofthe earth constructed by
using orthographic projections on a horizontal plane without considering the
curvature of Earth.
> A plan is drawn relatively to large scale. Map:
> When
the scale is small plan is called map. A map is generally drawn when extent of
area is large such as city map, district map, country map, etc.
> On
a map vertical distances are also represented by contours, hatchers, etc.
> Projection
system other than orthographic system is used.
Scale:
> Scale is the fixed ratio that
every distance on plan or map corresponds to a distance or ground.
Scale
= Distance on plan or map distance on ground
> A good draughtsman can plot to an accuracy
of 0.25 mm.
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