NCERT Class 11 Practical Geography Chapter 5: Topographical Maps | CBSE | English |Plotting Contours

Mains Lectures organized in topics and subtopics: https://www.doorsteptutor.com/Exams/I... For IAS Prelims visit https://www.doorsteptutor.com/Exams/I... For GS test series refer - https://www.doorsteptutor.com/Exams/I... IAS Mains Geography optional postal course visit - http://www.examrace.com/IAS/IAS-Flexi... NTA-NET Geography - https://www.examrace.com/NTA-UGC-NET/... Geography Optional recorded lectures covering complete syllabus in most systematic form - https://www.doorsteptutor.com/Exams/I... Join our fully evaluated UPSC Geography optional test series at - https://www.doorsteptutor.com/Exams/I... For Maps and locations (revised and updated - includes section on education, defense and more) book click here - http://www.examrace.com/IAS/IAS-Flexi... NTA NET Geography practice questions - https://www.doorsteptutor.com/Exams/U... Practice and Prepare @ https://www.doorsteptutor.com/ Lectures on Various Subjects like Science, Social Studies and Humanities subscribe    / testprep   Examrace Lectures in Hindi subscribe    / examracehindi   For kids videos nursery to Class 5 subscribe    / funprof   For Science (Physics, Chemistry, Biology and Mathematics) Class 11-12 and important topics subscribe    / doorsteptutor   Also visit NCERT Solutions, NIOS @ https://www.flexiprep.com/ IGCSE, A & AS Level @ https://www.examtestprep.com/ These maps show important natural and cultural features such as relief, vegetation, water bodies, cultivated land, settlements, and transportation networks, etc. These maps are prepared and published by the National Mapping Organisation of each country. For example, the Survey of India prepares the topographical maps in India for the entire country. The topographical maps are drawn in the form of series of maps at different scales. Hence, in the given series, all maps employ the same reference point, scale, projection, conventional signs, symbols and colours. Topographic Map: A map of a small area drawn on a large scale depicting detailed surface features both natural and man made. Relief in this map is shown by contours. Contours: Imaginary lines joining all the points of equal elevation or altitude above mean sea level. They are also called “level lines”. Contour Interval: Interval between two successive contours. It is also known as vertical interval, usually written as V. I. Generally, it is constant for a given map. Cross-section: A side view of the ground cut vertically along a straight line. It is also known as a section or profile. Hachures: Small straight lines drawn on the map along the direction of maximum slope, running across the contours. They given an idea about the differences in the slope of the ground. The slopes can broadly be classified into gentle, steep, concave, convex and irregular or undulating. The contours of different types of slopes show a distinct spacing pattern. Gentle Slope - When the degree or angle of slope of a feature is very low, the slope will be gentle. The contours representing this type of slope are far apart. Steep Slope - When the degree or angle of slope of a feature is high and the contours are closely spaced, they indicate steep slope. Steps for Drawing a Cross-section The following steps may be followed to draw cross-sections of various relief features from their contours : 1. Draw a straight line cutting across the contours on the map and mark it as AB. 2. Take a strip of white paper or graph and place its edge along the AB line. 3. Mark the position and value of every contour that cuts the line AB. 4. Choose a suitable vertical scale, eg ½ cm =100 metres, to draw horizontal lines parallel to each other and equal to the length of AB. The number of such lines should be equal or more than the total contour lines. Chapters: 0:00 NCERT Class 11 Practical Geography Chapter 5: Topographical Maps 0:25 Topographical Maps 2:14 Topographical Maps in India 8:06 Defence Maps 11:38 Index Contour 12:34 Methods of Relief Representation 14:29 Contours 19:04 Example of a Concave Vs Convex Slope 20:36 V-Shaped and U-Shaped Valley 22:18 Waterfall Vs Cliff 23:25 Interpretation #practicalgeography #topographicalmaps #topographicalmapsinindia #defencemaps #indexcontour #methodsofreliefrepresentation #contours #exaxmpleofaconcavevsconvexslope #vshapedandushapedvalley #waterfallvscliff #interpretation #examrace #examrace #upsc #ugcnet