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When we look to an object directly – horizontal perspective When we look below – birds eye view – aerial perspective The photographs taken from an aircraft or helicopter using a precision camera are termed aerial photographs. Aerial Camera : A precision camera specifically designed for use in aircrafts. Aerial Film : A roll film with high sensitivity, high intrinsic resolution power and dimensionally stable emulsion support. Aerial Photography : Art, science and technology of taking aerial photographs from an air-borne platform. Aerial Photograph : A photograph taken from an air-borne platform using a precision camera. Fiducial Marks : Index marks, rigidly connected at the central or corner edges of the camera body. When the film is exposed, these marks appear on the film negative . Forward Overlap : The common area on two successive photographs in the flight direction. It is usually expressed in per cent. Image Interpretation : An act of identifying the images of the objects and judging their relative significance. Nadir Point : The foot of the perpendicular drawn from the camera lens centre on the ground plane. Principal Point : The foot of the perpendicular drawn from the camera lens centre on the photo plane. Principal Distance : The perpendicular distance from the perspective centre to the plane of the photograph. Perspective Centre : The point of origin (perspective centre) of the bundle of light rays. Photogrammetry : The science and technology of taking reliable measurements from aerial photographs.
Chapters: 0:00 NCERT Class 11 Practical Geography Chapter 6 0:03 Aerial Photography 0:05 Horizontal Perspective 4:03 Why Do We Actual Use the Aerial Photography? 4:15 Uses of Aerial Photography 6:51 Advantages of Aerial Photography 8:02 Types of Aerial Photographs 8:29 Vertical Photographs 9:34 Low Oblique Photographs 10:16 High Oblique Photographs 12:56 Types of Aerial Photographs 13:10 Large Scale 13:39 Medium Scale 14:08 Small Scale 14:38 Geometry of Aerial Photographs 14:55 Parallel Projection 15:27 Perpendicular Projection 16:00 Central Projection 18:02 Difference Between Aerial Photograph and Map 19:29 Perspective View 19:53 Planimetric View 20:48 Scale of Aerial Photographs 21:21 Establishing Relationship Between Photo Distance and Ground Distance 22:17 Establishing Relationship Between Photo Distance and Map Distance 23:51 Establishing Relationship Between Focal Length (f) and Flying Height (H) of the Aircraft 24:38 General Layout for Aerial Photograph #practicalgeography #aerialphotography #horizontalperspective #verticalphotographs #lowobliquephotographs #highobliquephotographs #largescale #mediumscale #smallscale #geometryofaerialphotographs #parallelprojection #perpendicularprojection #centralprojection #map #perspectiveview #planimetricview #scaleofaerialphotographs #photodistance #grounddistance #mapdistance #focallength #flyingheight #aircraft #generallayout #examrace
Improved vantage point: Aerial photography provides a bird’s eye view of large areas Time freezing ability: An aerial photograph is a record of the surface features at an instance of exposure – provide historical record Broadened Sensitivity: Our eyes perceive only in the visible region of the electromagnetic spectrum, i.e. 0.4 to 0.7 μm whereas the sensitivity of the film ranges from 0.3 to 0.9 μm. Three Dimensional Perspective: Aerial photographs are normally taken with uniform exposure interval that enables us in obtaining stereo pair of photographs #examrace #upsc #ugcnet
