5. Remote Sensing
The unit covers the fundamental aspects of remote sensing, including the principles, applications, advantages, and disadvantages of the technology. It emphasizes the interaction of the electromagnetic spectrum (EMS) with the atmosphere and its implications for satellite imagery quality. The unit highlights the significance of sensors' characteristics, the necessity of geometric and radiometric corrections, and the importance of accuracy assessments in thematic mapping.
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What we have learnt
- Remote sensing is the science of gathering information about objects from a distance, primarily using electromagnetic radiation.
- Different parts of the electromagnetic spectrum interact variably with objects on Earth's surface, influencing the quality and accuracy of remote sensing data.
- The effectiveness of remote sensing is dependent on understanding both the advantages in data collection and the limitations in data interpretation.
Key Concepts
- -- Electromagnetic Spectrum (EMS)
- The range of all types of electromagnetic radiation, which varies in wavelength and frequency.
- -- Remote Sensing
- The acquisition of information about an object or phenomenon without making physical contact, primarily through satellite or aerial sensors.
- -- Spatial Resolution
- The smallest discernible unit in a satellite image, which varies based on the sensor's capability.
- -- Thematic Map
- A map that shows the distribution of a particular theme or topic across a geographic area.
- -- Reflectance
- The proportion of incident electromagnetic radiation that is reflected off the surface of an object.
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