Short Answer questions
What is a 'map'?
A map is defined as a representation of the earth's surface or a part of it, showing natural or man-made features, drawn to scale on a flat surface.
State the essential features of a map.
The essential features of a map are:
- Grid System
- Conventional Signs
- Key or Legend
What do you mean by the 'key' of a map?
Key of a map explains the meaning of the symbols that are used in the map. It is also known as legend.
Into how many categories have the maps been classified?
On the basis of size, maps can be classified into two categories:
- Large scale maps (Cadastral maps and Topographical maps)
- Small scale maps (Atlas maps and Wall maps)
On the basis of content and purpose, maps can be classified into three types-
- Physical maps
- Political maps
- Thematic maps
What are the topographical maps?
A topographical map shows the surface of the earth in detail. These maps are drawn on a number of sheets where each sheet depicts the details of only one particular part of the whole area. these sheets are joined to give a complete picture of the entire area.
Topographical maps show physical features like valleys, hills, peaks etc., as well as man-made features like roads, railways, canals etc.
What is the National Grid Reference (NGR)?
Grid lines are imaginary lines drawn on a survey map in red colour. The origin of the Grid is a point south-west of the map. The 'National Grid Reference' is used for indicating the correct position of a particular feature on the map.
Give the four-figure grid reference of the following from the given map extract:
- Two settlements having a Post office.
- Two settlements having a dispensary.
- The settlement having a Siphon.
- The settlement having the confluence of the main river and Dior Nadi.
- The settlement with the words Brackish.
- 6131, 6233
- 6234, 6032
Give the six-figure grid reference of the following from the given map extract:
- Police Station.
- Post office at Malgaon.
- Surveyed tree at Posintra.