Lidar uses laser light to measure distances by illuminating targets. It is an active remote sensing method. The document discusses remote sensing concepts like platforms, sensors, data collection using electromagnetic radiation, and data interpretation techniques. It provides examples of Indian remote sensing satellites like Resourcesat and Cartosat, and describes their sensors and applications in areas like agriculture, mapping, and disaster management. Visual interpretation of remote sensing images involves analyzing tone, shape, size, pattern, texture, shadows, and associations of targets.
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