Sensor Resolutions
Remote sensors possess three key characteristics: spatial, spectral, and radiometric resolutions, which are crucial for extracting valuable information about various terrain conditions.
Spatial Resolution: This aspect can be understood by considering how some people use spectacles while reading. Individuals with poor vision may struggle to distinguish between closely spaced letters in a word. By using spectacles, they enhance their vision and resolving power. Similarly, in remote sensing, spatial resolution refers to the sensor’s ability to differentiate between closely spaced object surfaces. Higher spatial resolution allows for the identification of smaller object surfaces.
Spectral Resolution: This refers to the sensor’s ability to sense and record electromagnetic radiation (EMR) across different bands. Multispectral images are captured using devices that disperse the incoming radiation and record it using detectors sensitive to specific spectral ranges. This process is akin to the dispersion of light in nature, as seen in rainbows, or using prisms in laboratories. Images obtained in different spectral bands reveal how objects respond differently to varying wavelengths of light. For example, images acquired by IRS P – 6 (Resource sat – 1) show the strong absorption properties of fresh water in the infrared band and mixed strong reflectance in the green band by dry surfaces.
Radiometric Resolution: This aspect refers to the sensor’s ability to distinguish between two targets based on their radiance. Higher radiometric resolution means that the sensor can detect smaller differences in radiance between two targets.
Chapter 6: Introduction to Remote Sensing| Class 11 Geography Practical Work
Class 11 Geography Ch 6 Introduction to Remote Sensing Notes: Introduction to Remote Sensing is the sixth chapter in CBSE Class 11 Geography, which discusses the concept of Remote Sensing and its various forms. The chapter explains how this technique works, its different methods, and how it’s used in various fields like geography, agriculture, and environmental science.
Students learn about the sensors used to collect data, like cameras and scanners, and how they create images and information about the Earth. They also learn how to analyze this data to understand changes in things like land use, vegetation, and the environment. Overall, the chapter helps students understand how remote sensing helps us learn more about our planet from afar.
Chapter 6: Introduction to Remote Sensing| Class 11 Geography Practical Work
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