NCERT Class 11 Geography Chapter 29 Introduction to Aerial Photography

NCERT Class 11 Geography Chapter 29 Introduction to Aerial Photography Solutions to each chapter is provided in the list so that you can easily browse through different chapters NCERT Class 11 Geography and select need one. NCERT Class 11 Geography Question Answers Download PDF. NCERT Geography Class 11 Solutions.

NCERT Class 11 Geography Chapter 29 Introduction to Aerial Photography

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. CBSE Class 11 Geography Solutions are part of All Subject Solutions. Here we have given NCERT Class 11 Geography Part I: Fundamentals of Physical Geography, Part II: Indian: Physical Environment, Part III: Practical Work in Geography. NCERT Class 11 Geography Notes, NCERT Class 11 Geography Textbook Solutions for All Chapters, You can practice these here.

Introduction to Aerial Photography

Chapter: 29

GEOGRAPY [ PART – III ]

VERY SHORT ANSWER TYPE QUESTIONS

Q.1. What is an aerial camera?

Ans. A precision camera specially designed for use in aircraft.

Q.2. What is aerial photography?

Ans. Art, science and technology of taking aerial photographs from an air borne platform.

Q.3. What do you mean by image interpretation?

Ans. An act of identifying the images of the objects and judging their relative significance.

Q.4. What is Nadir point?

Ans. The foot of the perpendicular drawn from the camera lens centre on the ground plane.

SHORT ANSWER TYPE QUESTIONS

Q.1. State any three advantages that an aerial photograph offers over ground based observations. 

Ans. The advantages are: 

(i) Improved Vantage Point.

(ii) Time freezing ability.

(iii) Broaded sensitivity.

(iv) Three dimentional perspective.

Q.2. How is an aerial photograph taken?

Ans. The aerial photograph is taken from an aircraft or a helicopter using a precision camera.

Q.3. Present a concise account of aerial photograph in India.

Ans. Aerial photographs were started in 1920 when large scale aerial photograph of Agra city was taken. Subsequently Air Survey party of Survey of India took up aerial survey at Irawadi Delta forests which was completed in 1923-24. Today aerial photographs in India are carried out for the entire country under the over all super vision of the Directorate of Air Survey, New Delhi.

Three flying agencies are Indian Air Force, Air Survey Company, Kolkata and National Remote Sensing Agency, Hyderabad have been officially authorised to take aerial photographs.

Q.4. What are the advantages of aerial photography?

Ans. The following are the advantages:

1. Time freezing ability.

2. Broadcasting sensitibility.

3. Three dimensional perspective.

4. Improved vantage point.

Q.5. Give the types of aerial photographs.

Ans. The types of photographs are:

1. Vertical photographs.

2. Low oblique.

3. High oblique.

LONG ANSWER TYPE QUESTIONS

Q.1. What are the two major uses of an aerial photograph? Elaborate.

Ans. The uses of aerial photographs are:

1. Photogrammetry: It refers to the science and technology of making reliable measurements from aerial photographs.

2. Image Interpretation: It is an art of identifying images of objects and judging their relative significance.

Q.2. What are the different methods of scale determination?

Ans. There are three methods of determining the scale:

1. By establishing relationship between photo distance and ground distance: In this method if additional information like ground distance of two identifiable points in an aerial photograph is available it is simple to work out the scale of a vertical photograph.

2. By establishing relationship between photo distance and map distance: If a reliable map is available for the area shown on an aerial photograph it can be used to determine the photo scale.

3. By establishing relationship between focal length and flying height of the Aircraft: We can determine the photo scale provided the information about the focal length of camera and the flying height of the aircraft are known.

Q.3. What is the geometry of aerial photographs?

Ans. To understand the geometry of an aerial photographs it is important to appreciate the orientation of the photography with aspect to the ground i.e. the way the rays connect or project on the ground in relation to the ground representation.

Q.4. Distinguish between aerial photography and map.

Ans.

Aerial Photograph	Map
• It is a central projection.	• It is an orthogonal projection.
• The scale of the photograph is not uniform.	• The scale of the map is uniform throughout the map extent.
• Enlargement/reduction does not change the contents of the photographs and can easily be carried out.	• Enlargement/reduction of the maps involves redrawing it afresh.
• Aerial photography holds good for inaccessible and inhospitable areas.	• The mapping of inaccessible and inhospitable areas is very difficult and sometimes it becomes impossible.