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Maps

CHAPTER 4
MAPS

A map is a representation or a drawing of the earth’s surface or a part of it drawn on a flat surface according to a scale. But it is impossible to flatten a round shape completely.

Maps provide more information than a globe. They are of different types. Some of them are described below.

1.  PHYSICAL MAPS

Maps showing natural features of the earth such as mountains, plateaus, plains, rivers, oceans etc. are called physical or relief maps.

2.  POLITICAL MAPS

Maps showing cities, towns and villages, and different countries and states of the world with their boundaries are called political maps.

3.  THEMATIC MAPS

Some maps focus on specific information; such as road maps, rainfall maps, maps showing distribution of forests, industries etc. are known as thematic maps.

Suitable titles are given on the basis of information provided in these maps.

4.  CADASTRAL MAPS

Town maps and village maps; showing details of streets, plots and fields in the area.

SCALE:-

The scale of the map is the ratio of proportion between the dimension on the map and the actual dimension on the earth.

Scale of map may also be indicated by a fraction called the Representative Fraction (RF) in which numerator is 1.
R.F of a map =  Distance on the map
Distance on the ground

The R.F of a map may be indicated as 1/ 100,000 or 1 : 100,000. This means one unit of distance on the map is equal to 100,000 units on the ground.

Maps are divided as large-scale maps and small scale maps on the basis of scale. The topographic map which is on a scale of 1: 50,000 is a large scale map. In a large scale map small areas are representative on a large size map. Wall map is a small – scale map. It shows a large area on a small size map.

Maps - Physical Geography, UPSC, IAS. | Geography (Prelims) by Valor Academy

REPRESENTATION OF RELIEF FEATURES

CONTOURS

In cartography, a contour line joins points of equal elevation (height) above a given level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes. The contour interval of a contour map is the difference in elevation between successive contour lines.

More generally, a contour line for a function of two variables is a curve connecting points where the function has the same particular value. The gradient of the function is always perpendicular to the contour lines. When the lines are close together the magnitude of the gradient is large: the variation is steep. A level set is a generalization of a contour line for functions of any number of variables.

Contour lines are curved or straight lines on a map describing the intersection of a real or hypothetical surface with one or more horizontal planes. The configuration of these contours allows map readers to infer relative gradient of a parameter and estimate that parameter at specific places. Contour lines may be either traced on a visible three-dimensional model of the surface, as when a photogrammetrist viewing a stereo-model plots elevation contours, or interpolated from estimated surface elevations, as when a computer program threads contours through a network of observation points of area centroids. In the latter case, the method of interpolation affects the reliability of individual isolines and their portrayal of slope, pits and peaks.

Maps - Physical Geography, UPSC, IAS. | Geography (Prelims) by Valor Academy

Elevation and depth

Contours  are  one  of  several  common  methods  used  to denote elevation or altitude and depth on maps. From these contours, a sense of the general terrain can be determined. They are used at a variety of scales, from large-scale engineering drawings  and  architectural  plans,  through topographic maps up to continental-scale maps.

"Contour line" is the most common usage in cartography, but isobaths for underwater depths on bathymetric maps and isohypse for elevations are also used. The process of drawing isohypse contour lines on a map is called isopletion.

Maps - Physical Geography, UPSC, IAS. | Geography (Prelims) by Valor Academy

In cartography, a contour interval is any space between contour lines, representing a difference in elevation between the lines. When calculated as a ratio against the map scale, a sense of the hilliness of the terrain can be derived.

If contour lives are closer, it indicates a steep slope; gentle slope is indicated when contours are widely spaced.

CONVENTIONAL SIGNS AND SYMBOLS (ADOPTED BY SURVEY OF INDIA)

It is the third important component of a map. It is not possible to draw on a map the actual shape and size of different features such as buildings, roads, bridges, trees, railway lines or a well. So, they are shown by using certain letters, shades, colours, pictures and lines. These symbols give a lot of information in a limited space. With the use of these symbols, maps can be drawn easily and are simple to read. Even if you don’t know the language of an area and therefore cannot ask someone for directions, you can collect information from maps with the help of these symbols. Maps have a universal language that can be understood by all. There is an international agreement regarding the use of these symbols. These are called conventional symbols.

Maps - Physical Geography, UPSC, IAS. | Geography (Prelims) by Valor Academy

Various colours are used for the same purpose. For example, generally blue is used for showing water bodies, brown for mountain, yellow for pleatue and green is used for plains.

DIRECTION

There are four major directions, North, South, East and West. They are called cardinal points. Other four intermediate directions are north-east (NE), southeast (SE), south-west (SW) and north-west (NW). We can locate any place more accurately with the help of these intermediate directions.

Maps - Physical Geography, UPSC, IAS. | Geography (Prelims) by Valor Academy

The document Maps - Physical Geography, UPSC, IAS. | Geography (Prelims) by Valor Academy is a part of the UPSC Course Geography (Prelims) by Valor Academy.
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FAQs on Maps - Physical Geography, UPSC, IAS. - Geography (Prelims) by Valor Academy

1. What is physical geography?
Ans. Physical geography is a branch of geography that studies the natural features and processes of the Earth's surface, including landforms, climate, vegetation, and water bodies. It focuses on understanding the physical characteristics and interactions of the Earth's natural environment.
2. How is physical geography related to UPSC and IAS exams?
Ans. Physical geography is an important topic in the UPSC and IAS exams. It is included in the syllabus to assess the candidates' knowledge and understanding of the Earth's physical features and processes. Questions related to physical geography often appear in the prelims as well as the mains exam.
3. What are some important concepts in physical geography that UPSC and IAS aspirants should focus on?
Ans. UPSC and IAS aspirants should focus on concepts such as plate tectonics, weathering and erosion, climatology, biogeography, geomorphology, hydrology, and oceanography. These concepts help in understanding the Earth's physical processes and features and are frequently asked in the exams.
4. How can I prepare for physical geography for the UPSC and IAS exams?
Ans. To prepare for physical geography, candidates should start by thoroughly studying the NCERT Geography textbooks of classes 11 and 12. They should also refer to standard reference books on physical geography and make notes for revision. Solving previous year question papers and taking mock tests will also help in understanding the exam pattern and improving time management skills.
5. Can you suggest some online resources or websites for studying physical geography for UPSC and IAS exams?
Ans. Yes, there are several online resources available for studying physical geography for UPSC and IAS exams. Some popular websites include the official UPSC website, ClearIAS (www.clearias.com), Mrunal (www.mrunal.org), and Geographia (www.geographia.com). These websites provide study materials, articles, and quizzes to help candidates prepare for the exams.
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