NCERT Solutions Class 11 Geography (Practical Work in Geography) Chapter 7 Introduction To Remote Sensing – Here are all the NCERT solutions for Class 11 Geography (Practical Work in Geography) Chapter 7. This solution contains questions, answers, images, explanations of the complete chapter 7 titled Of Introduction To Remote Sensing taught in Class 11. If you are a student of Class 11 who is using NCERT Textbook to study Geography (Practical Work in Geography), then you must come across chapter 7 Introduction To Remote Sensing After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 11 Geography (Practical Work in Geography) Chapter 7 Introduction To Remote Sensing in one place.
NCERT Solutions Class 11 Geography Chapter 7 Introduction To Remote Sensing
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For a better understanding of this chapter, you should also see summary of Chapter 7 Introduction To Remote Sensing , Geography, Class 11.
Class | 11 |
Subject | Geography |
Book | Practical Work In Geography |
Chapter Number | 7 |
Chapter Name |
Introduction To Remote Sensing |
NCERT Solutions Class 11 Geography chapter 7 Introduction To Remote Sensing
Class 11, Geography chapter 7, Introduction To Remote Sensing solutions are given below in PDF format. You can view them online or download PDF file for future use.
Introduction To Remote Sensing
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Question & Answer
Q.1: Choose the right answer from the four alternatives given below
(i) Remote sensing of objects can be done through various means such as remote sensors,
human eyes and photographic system. Which of the following represents the true order of the revolution.
(a) ABC
(b) BCA
(c) CAB
(d) None of the above
(ii) Which of the following regions of Electromagnetic spectrum is not used in satellite remote sensing.
(a) Microwave region
(b) Infrared region
(c) X - rays
(d) Visible region
(iii) Which of the following is not used in visual interpretation technique ?
(a) Spatial arrangements of objects
(b) Frequency of tonal change on the image
(c) Location of objects with respect to other objects
(d) Digital image processing
Ans : (i) (b) BCA (ii) (c) X - rays (iii) (b) Frequency of tonal change on the image
Q.2: Answer the following questions in about 30 words.
(i) Why is remote sensing a better technique than other traditional methods?
(ii) Differentiate between IRS and INSAT series of satellites.
(iii) Describe in brief the functioning of pushbroom scanner.
Ans : (i) Remote sensing is an important technique for many geo-disciplines to collect information about the spatial distribution of objects at the Earth's surface such as crops, vegetation, soil, rock, snow, surface water, to identify object properties and to investigate their seasonal changes without in physical contact of object and phenomena, but in the traditional method of collecting this information has been time consuming and very expensive. Data collection using ground surveys is impractical for large projects. The end result is that traditional methods require a substantial amount of time. (ii) IRS is a constellation of geosynchronous satellites at an altitude of 700 - 900 km providing navigation system that is used to provide accurate real- time positioning and timing services over India and region extending to 1500 km around India. The Indian National Satellite System or INSAT, is a series of multipurpose geo-stationary satellites and revolves around the earth at an altitude of nearly 36,000 km launched by ISRO to satisfy the telecommunications, broadcasting, meteorology, and search and rescue operations. (iii) A push broom scanner is a technology for obtaining images with spectroscopic sensors. The pushbroom scanners consist of a number of detectors, which are equivalent to the number obtained by dividing the swath of the sensor by the size of the spatial resolution. In pushbroom scanner, all detectors are linearly arrayed and each detector collects the energy reflected by the ground cell (pixel) dimensions of 20 metres at a nadir's view.
Q.3: Answer the following questions in about 125 words.
(i) Describe the operation of a whiskbroom scanner with the help of diagram. Explain how it is different from pushbroom scanner.
(ii)Identify and list the changes that can be observed in the vegetation of Himalayas
Ans : (i) A whiskbroom is a technology for obtaining satellite images with optical cameras. In a whiskbroom sensor, a mirror scans across the satellite's path, reflecting light into a single detector, which collects data one pixel at a time. A whiskbroom scanner sweeps in a direction perpendicular to the flight path, collecting one pixel at a time. The mirror is so oriented that when it completes a rotation, the detector sweeps across the field of view between 900 and 1200 to obtain images from visible to middle infrared regions of the spectrum, but the pushbroom scanners consist of a number of detectors, which are equivalent to the number obtained by dividing the swath of the sensor by the size of the spatial resolution. (ii) Images of Himalayas and Northern Indian Plain by IRS Satellite taken in May and November show differences in the types of vegetation. The red patches in May image refer to coniferous vegetation. In November image the additional red patches refer to deciduous vegetation and the light red colour is related to the rabi crops.
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