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Preeti Dabral 3 years, 1 month ago
As we noted in the previous section, analysis of remote sensing imagery involves the identification of various targets in an image, and those targets may be environmental or artificial features which consist of points, lines, or areas. Targets may be defined in terms of the way they reflect or emit radiation. This radiation is measured and recorded by a sensor, and ultimately is depicted as an image product such as an air photo or a satellite image.
Explanation:
What makes interpretation of imagery more difficult than the everyday visual interpretation of our surroundings? For one, we lose our sense of depth when viewing a two-dimensional image, unless we can view it stereoscopically so as to simulate the third dimension of height. Indeed, interpretation benefits greatly in many applications when images are viewed in stereo, as visualization (and therefore, recognition) of targets is enhanced dramatically. Viewing objects from directly above also provides a very different perspective than what we are familiar with. Combining an unfamiliar perspective with a very different scale and lack of recognizable detail can make even the most familiar object unrecognizable in an image. Finally, we are used to seeing only the visible wavelengths, and the imaging of wavelengths outside of this window is more difficult for us to comprehend.
Recognizing targets is the key to interpretation and information extraction. Observing the differences between targets and their backgrounds involves comparing different targets based on any, or all, of the visual elements of tone, shape, size, pattern, texture, shadow, and association. Visual interpretation using these elements is often a part of our daily lives, whether we are conscious of it or not. Examining satellite images on the weather report, or following high speed chases by views from a helicopter are all familiar examples of visual image interpretation. Identifying targets in remotely sensed images based on these visual elements allows us to further interpret and analyze. The nature of each of these interpretation elements is described below, along with an image example of each...
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लोकतंत्र(लोकतन्त्र) (शाब्दिक अर्थ "लोगों का शासन", संस्कृत में लोक, "जनता" तथा तंत्र, "शासन",) या प्रजातंत्र(प्रजातन्त्र) एक ऐसी शासन व्यवस्था और लोकतांत्रिक (लोकतान्त्रिक) राज्य दोनों के लिये प्रयुक्त होता है। यद्यपि लोकतंत्र(लोकतन्त्र) शब्द का प्रयोग राजनीतिक सन्दर्भ(संदर्भ) में किया जाता है, किन्तु(किंतु) (लोकतंत्र) का सिद्धान्त(सिद्धांत) दूसरे समूहों और सङ्गठनों(संगठनों) के लिये भी सङ्गत(संगत) है। मूलतः लोकतन्त्र(लोकतंत्र) भिन्न-भिन्न सिद्धान्तों(सिद्धांतों) के मिश्रण बनाती हैै। लोकतन्त्र(लोकतंत्र) एक ऐसी शासन प्रणाली है, जिसके अन्तर्गत(अंतर्गत) जनता अपनी स्वेच्छा से चुनाव में आए हुए किसी भी दल को मत देकर अपना प्रतिनिधि चुन सकती है, तथा उसकी सत्ता बना सकती है। लोकतन्त्र(लोकतंत्र) दो शब्दों से मिलकर बना है ,लोक + तन्त्र(तंत्र) लोक का अर्थ है जनता तथा तन्त्र(तंत्र) का अर्थ है शासन
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