Map Reading – Detailed Summary
Book: Samacheer Kalvi 7th Social Science
Term: Term 3
Subject: Geography
Unit: Unit 2
Lesson Name: Map Reading
About the Lesson
“Map Reading” is an important Geography lesson in the Samacheer Kalvi 7th Social Science book. This lesson explains how to read, understand and use maps.
A map is an essential tool for a geographer. It helps us understand the earth, continents, countries, states, districts, towns, villages, roads, rivers, mountains, forests and many other features.
Learning Objectives
- To understand the meaning and importance of maps.
- To learn about cartography and cartographers.
- To know cardinal and intermediate directions.
- To understand the importance of scale in a map.
- To learn the meaning of legend or key.
- To understand conventional signs and symbols.
- To know the types of maps.
- To learn about atlas and its types.
- To understand colours and symbols used in maps.
- To develop basic map-reading skills.
Detailed Summary of the Lesson
1. Meaning of Map
A map is a representation of the earth as a whole or a part of the earth drawn on a flat surface according to a given scale.
Maps can show large areas such as continents and countries. They can also show small areas such as cities, towns, villages, roads and local places.
2. Importance of Maps
Maps are important because they help us understand the location, direction, distance, size and features of places.
Maps are used by students, teachers, geographers, travellers, pilots, sailors, soldiers, engineers, planners and government officials.
3. Map as a Tool of Geographers
A map is an essential tool of a geographer.
Geographers use maps to study landforms, climate, population, agriculture, industries, transport, natural resources and settlement patterns.
4. Cartography
The science of map-making is called cartography.
The word cartography comes from “carte”, meaning map, and “graphy”, meaning drawing.
5. Cartographer
A person who draws maps is called a cartographer.
Cartographers use symbols, colours, scale, directions and accurate measurements to prepare maps.
6. Globe and Map
A globe is a three-dimensional model of the earth.
A map is a flat representation of the earth or part of the earth. A globe shows the earth more accurately, but a map is easy to carry, fold and use.
7. Directions in a Map
Directions help us locate places correctly on a map.
Every map usually shows north direction. Once we know north, we can identify the other directions.
8. Cardinal Directions
North, South, East and West are called cardinal directions.
These are the four main directions used in map reading.
9. Intermediate Directions
The directions between the cardinal directions are called intermediate directions.
- North-East
- South-East
- South-West
- North-West
10. North Line
The north line is usually shown by the letter N on the map.
It is commonly placed in the upper right corner of a map. It helps us find direction.
11. Scale
Scale is the ratio between the distance on a map and the actual distance on the ground.
For example, if the scale is 1 cm = 10 km, it means 1 cm on the map represents 10 km on the ground.
12. Importance of Scale
Scale helps us measure the real distance between two places.
Without scale, we cannot correctly understand the actual size and distance shown in a map.
13. Large-Scale Maps
Large-scale maps show small areas with more details.
They are useful for showing districts, towns, villages, streets, buildings and local features.
14. Small-Scale Maps
Small-scale maps show large areas with fewer details.
They are useful for showing continents, countries and large regions.
15. Legend or Key
A legend or key explains the different colours and symbols used in a map.
It helps us understand what each symbol, line, colour or sign represents.
16. Conventional Signs and Symbols
The common signs and symbols that are internationally accepted and used in maps are called conventional signs and symbols.
These symbols help to show roads, railways, rivers, canals, bridges, temples, forests, dams, airports, railway stations and settlements.
17. Need for Symbols
It is not possible to draw every real object exactly on a map.
So symbols are used to represent different features. Symbols make maps simple, clear and easy to understand.
18. Colours Used in Maps
Colours are used in maps to show physical and cultural features.
- Blue – water bodies such as rivers, lakes and seas.
- Brown – mountains and highlands.
- Green – lowlands, plains and vegetation.
- Yellow – agriculture in some thematic maps.
- Black – railway lines and some man-made features.
19. Title of a Map
The title of a map describes the information given in the map.
For example, a map titled “Rainfall Map of India” shows rainfall distribution in India.
20. Types of Maps
Maps are classified based on the information they show.
- Physical maps
- Political maps
- Cultural maps
- Population maps
- Economic maps
- Transportation maps
- Climatic maps
- Soil maps
- Cadastral maps
21. Physical Maps
Physical maps show natural relief features.
They show mountains, plateaus, plains, rivers, lakes, valleys, seas and oceans.
22. Political Maps
Political maps show administrative divisions.
They show countries, states, districts, capitals, cities and boundaries.
23. Cultural Maps
Cultural maps show man-made features.
They may show settlements, roads, railways, industries, religious places and other human-made features.
24. Population Maps
Population maps show the distribution, density and growth of population.
These maps help us understand where people live more densely and where population is sparse.
25. Economic Maps
Economic maps show the production and distribution of crops, minerals, industries, trade routes and flow of commodities.
These maps are useful for understanding economic activities of a region.
26. Transportation Maps
Transportation maps show roads, railway lines, airports, seaports and railway stations.
These maps are useful for travel, transport planning and route identification.
27. Climatic Maps
Climatic maps show climatic features.
They may show distribution of temperature, rainfall, pressure, wind and other weather or climate-related details.
28. Soil Maps
Soil maps show the distribution of different types of soil.
They are useful for agriculture, land use planning and environmental studies.
29. Cadastral Maps
Cadastral maps are known as village and town maps.
They show land ownership, field boundaries, streets, buildings and local-level details.
30. Atlas
An atlas is a collection of maps in a book.
Atlas maps are usually small-scale maps. They cover large areas such as continents and countries.
31. Importance of Atlas
Atlas helps us study the geographical characteristics of a large area at one time.
It contains different types of maps such as physical, political, climatic, population, economic and transportation maps.
32. Types of Atlas
The main types of atlas are:
- School Atlas
- Advanced Atlas
- Regional Atlas
- National Atlas
33. Outline Map
An outline map shows only the outer boundary of a country, state or region.
Students use outline maps to mark rivers, mountains, capitals, states, districts and other important features.
34. Map Reading Skill
Map reading means understanding the information shown on a map.
To read a map properly, we should observe the title, direction, scale, legend, colours and symbols.
35. Steps to Read a Map
- Read the title of the map.
- Check the north direction.
- Understand the scale.
- Read the legend or key.
- Observe colours and symbols.
- Identify physical and cultural features.
- Compare places, distance and direction.
36. Map Work Practice
In map work, students are often asked to mark features using symbols and colours.
Common features include district capitals, river paths, mountains, bridges, canals, dams, temples, forests and railway stations.
Central Idea of the Lesson
The central idea of the lesson is that maps are essential tools for understanding the earth and its features. A good map has title, direction, scale, legend, colours and symbols. Map reading helps us understand location, distance, direction, relief, transport, population, administration and economic activities.
Map Reading – Main Elements
| Element | Meaning / Use |
|---|---|
| Title | Describes the information given in the map. |
| Direction | Helps us identify north, south, east and west. |
| Scale | Shows the ratio between map distance and actual ground distance. |
| Legend / Key | Explains colours and symbols used in the map. |
| Symbols | Represent features such as roads, railways, rivers and temples. |
| Colours | Show water bodies, highlands, plains, agriculture and other features. |
Directions in Map
| Type | Directions |
|---|---|
| Cardinal Directions | North, South, East, West. |
| Intermediate Directions | North-East, South-East, South-West, North-West. |
| North Line | Shown by the letter N, usually in the upper right corner. |
Types of Maps
| Type of Map | What It Shows |
|---|---|
| Physical Map | Natural relief features such as mountains, rivers, plains and plateaus. |
| Political Map | Administrative divisions such as countries, states, districts and capitals. |
| Cultural Map | Man-made features such as settlements, roads and railways. |
| Population Map | Density, distribution and growth of population. |
| Economic Map | Crops, minerals, industries, trade routes and commodities. |
| Transportation Map | Roads, railways, airports, seaports and railway stations. |
| Climatic Map | Temperature, rainfall and other climatic features. |
| Cadastral Map | Village and town maps with detailed local features. |
Large-Scale and Small-Scale Maps
| Large-Scale Map | Small-Scale Map |
|---|---|
| Shows a small area. | Shows a large area. |
| Gives more details. | Gives fewer details. |
| Useful for villages, towns and districts. | Useful for continents and countries. |
| Example: town map, village map. | Example: world map, continent map. |
Atlas – Important Points
| Topic | Important Point |
|---|---|
| Atlas | A collection of maps in a book. |
| Atlas Maps | Usually drawn on a smaller scale. |
| Area Covered | Large areas like continents and countries. |
| Details Shown | Prominent relief features, main roads, railways and important towns. |
| Types | School Atlas, Advanced Atlas, Regional Atlas and National Atlas. |
Colours Used in Maps
| Colour | Common Use |
|---|---|
| Blue | Water bodies such as rivers, lakes and seas. |
| Brown | Mountains, highlands and relief features. |
| Green | Lowlands, plains and vegetation. |
| Yellow | Agriculture in some maps. |
| Black | Railway lines and some man-made features. |
Conventional Signs and Symbols
| Feature | How It Is Shown in Map Work |
|---|---|
| Bridge | Shown using a conventional bridge symbol. |
| Canal | Shown using a canal line symbol. |
| Dam | Shown using a dam symbol across a river. |
| Temple | Shown using a temple symbol. |
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