Resolving Powers of the Satellites

Introduction To Remote Sensing

The term “remote sensing” was coined in the early 1960s. It refers to the methods used to gather and measure information about objects and events without directly touching them. Instead, a recording device, called a sensor, is used to capture data from a distance. In remote sensing, there are three main components: the surface of the object being studied, the sensor recording the data, and the energy waves carrying the information. This definition highlights that remote sensing relies on capturing data from a distance using specialized equipment....

Stages in Remote Sensing

Remote sensing involves several processes to gather information about the Earth’s surface. These processes help collect data on the properties of objects and phenomena. Here are the basic steps involved:...

Sensors

A sensor is a device used in remote sensing to gather electromagnetic radiation, convert it into a signal, and present it in a suitable form for obtaining information about objects. Sensors are classified into photographic (analogue) and non-photographic (digital) sensors based on the form of data output....

Resolving Powers of the Satellites

In satellite remote sensing, the sun-synchronous polar orbit allows for the collection of images at regular intervals, known as the temporal resolution or revisit time. This enables the acquisition of images over the same area of the Earth’s surface at different points in time. These images can be compared to study and record changes occurring in the landscape....

Sensor Resolutions

Remote sensors possess three key characteristics: spatial, spectral, and radiometric resolutions, which are crucial for extracting valuable information about various terrain conditions....

Data Products

The detection and recording of electromagnetic energy can be done photographically or electronically. Photographic processes utilize light-sensitive film to detect and record energy variations, while scanning devices capture images in digital format. It’s crucial to differentiate between “images” and “photographs.” An image refers to a pictorial representation, regardless of the energy regions used for detection, whereas a photograph specifically denotes images recorded on photographic film. Thus, all photographs are images, but not all images are photographs....

Interpretation of Satellite Imageries

The data obtained from remote sensors the purpose of extracting information regarding the forms and patterns of objects and phenomena on the Earth’s surface. With different sensors yielding photographic and digital data products, both qualitative and quantitative properties of features can be extracted using visual interpretation methods or digital image processing techniques....

FAQs on Class 11 Geography Ch 6 Introduction to Remote Sensing

What is remote sensing?...