Toposheets is a topographic map which is a two dimensional representation of a three dimensional land surface.
Topographic maps are differentiated from the other maps in that they show both the horizontal and vertical position of the terrain.
Through a combination of contour lines, colours, symbols, labels and other graphical representation.
Topographic maps portray the shapes, location of mountains, and many other natural and manmade features.
To identify a map of a particular area, a map numbering system has been adopted by survey of India.
Toposheets classified according to scale:
- Large scale maps: Scale 1 in 1000 or less than 1000
- Medium scale maps: Scale from 1 in 1000 to 1 in 10000
- Small scale maps: Scale 1 in 10000 or greater than 10000
Uses:
- Firstly toposheet contains valuable reference information for surveyors.
- It is also map makers including bench mark, baseline and meridian and are used in civil engineers .
- Therefore it is also used environmental managers and urban planners as well as by emergency service agencies and historians.
- Toposheet are extremely useful for planning various projects.
- As they provide the required data in most convenient form so that the construction can be planned.
- One can use toposheets for planning of a building complex, an industrial plant, a railway and an irrigation project.
- One can plan Bridges, tunnels and dams from the toposheets.
- These are also helpful for directing military operations at the time of war.
- Therefore one can use them for the development of hydroelectric schemes, landscape, architecture, environmental protection and agriculture.
- Lastly one uses it in earth science and many other graphic disciplines mining and other earth based endeavors.
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