This cookie is set by GDPR Cookie Consent plugin. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. One of the most widespread uses of photogrammetry is in preparation of topographic maps. Photogrammetric analysis procedures range from obtaining distances, area, elevations using hardcopy (analog) photographic products, equipment’s and simple geometric concepts to generating precise digital elevation models, use of digital images and analytical techniques. It is the science and technology of obtaining spatial measurements and other geometrically derived products from aerial photographs. It refers to the occurrence of certain features in relation to others. This characteristic of photographs is especially important in identifying vegetation types and landforms. It refers to topographic or geographic location. However, they also obscure objects lying within them. Shadows aid interpreters in determining the height of objects in aerial photographs. random pattern formed by an unmanaged area of trees and the evenly spaced rows formed by an orchard. The patterns formed by objects in a photo can be diagnostic e.g. The impression of smoothness or roughness of image features is caused by the frequency of change of tone in photographs. Some objects can be identified almost solely on the basis of their shapes. Regular geometric shapes are usually indicators of human presence and use. It refers to the general outline of objects. The scale will help to determine the object. The size of objects must be considered in the context of the scale of a photograph. Tone refers to the relative brightness or colour of elements on a photograph. The most common instruments used are pocket stereoscope, mirror stereoscope, scanning stereoscope and interpreterscope.Īn interpreter uses the following basic characteristics of photograph:
One of the advantages of all aerial photographs is that when taken as overlapping pairs (called stereopairs) they can provide a 3D view or perspective view of the terrain.
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