<–2/”>a >Remote sensing refers to the measurement or acquisition of information about an object or phenomena from a distance without physical contact by using devices or sensors mounted on some platform. Remote sensors collect data by detecting the energy that is reflected from Earth. These sensors can be on satellites or mounted on aircraft.
Remote sensors can be either passive or active. Passive sensors respond to external stimuli. They record natural energy that is reflected or emitted from the Earth’s surface. The most common source of radiation detected by passive sensors is reflected sunlight.In contrast, active sensors use internal stimuli to collect data about Earth. For example, a laser-beam remote sensing system projects a laser onto the surface of Earth and measures the time that it takes for the laser to reflect back to its sensor.
The satellites of Indian Remote Sensing (IRS) satellites system which are in service today are IRS-1C, IRS-ID, IRS-P3, OCEANSAT-1, Technology Experimental Satellite (TES), RESOURCESAT-1, and the recently launched CARTOSAT-1 capable of taking stereo pictures. The upcoming Remote Sensing Satellite are Cartosat-2, RISAT (Radar Imaging Satellite) and Oceansat-2.
Applications:-
- Coastal applications: Monitor shoreline changes, track sediment transport, and map coastal features. Data can be used for coastal mapping and erosion prevention.
- Ocean applications: Monitor ocean circulation and current systems, measure ocean temperature and wave heights, and track sea ice. Data can be used to better understand the Oceans and how to best manage ocean Resources.
- Hazard assessment: Track hurricanes, Earthquakes, erosion, and flooding. Data can be used to assess the impacts of a natural disaster and create preparedness strategies to be used before and after a hazardous event.
- Natural resource management: Monitor land use, map wetlands, and chart wildlife habitats. Data can be used to minimize the damage that urban Growth has on the Environment and help decide how to best protect Natural Resources.
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The Indian Remote Sensing (IRS) Satellites are a series of Earth observation satellites developed and operated by the Indian Space Research Organisation (ISRO). The first IRS satellite, IRS-1A, was launched in 1988. The IRS satellites have been used for a variety of applications, including agriculture, Forestry, geology, hydrology, and urban planning.
The IRS satellites are divided into two series: the Resourcesat series and the Cartosat series. The Resourcesat series consists of four satellites: Resourcesat-1, Resourcesat-2, Resourcesat-3, and Resourcesat-2A. The Cartosat series consists of three satellites: Cartosat-1, Cartosat-2, and Cartosat-2A.
The IRS satellites are equipped with a variety of sensors, including multispectral sensors, hyperspectral sensors, and radar sensors. The multispectral sensors can collect data in multiple bands of the electromagnetic spectrum, which can be used to map different features on the Earth’s surface. The hyperspectral sensors can collect data in hundreds of bands of the electromagnetic spectrum, which can be used to identify specific materials on the Earth’s surface. The radar sensors can collect data in the microwave band of the electromagnetic spectrum, which can be used to penetrate clouds and vegetation.
The IRS satellites have been used for a variety of applications, including:
- Agriculture: The IRS satellites have been used to monitor crop growth, identify areas of drought and flooding, and assess crop yields.
- Forestry: The IRS satellites have been used to map forests, monitor deforestation, and assess the impact of forest fires.
- Geology: The IRS satellites have been used to map geological features, such as faults and lineaments, and to identify areas of mineral deposits.
- Hydrology: The IRS satellites have been used to map water bodies, monitor river flows, and assess the impact of floods and droughts.
- Urban planning: The IRS satellites have been used to map urban areas, monitor urban growth, and assess the impact of development.
The IRS satellites have been a valuable tool for a variety of applications. They have provided high-quality data that has been used to improve the lives of people around the world.
For example, the IRS satellites have been used to monitor crop growth and identify areas of drought and flooding. This information has been used to improve agricultural practices and to help farmers manage their crops more effectively. The IRS satellites have also been used to monitor deforestation and assess the impact of forest fires. This information has been used to develop policies to protect forests and to mitigate the effects of forest fires. The IRS satellites have also been used to map geological features, such as faults and lineaments. This information has been used to identify areas of potential landslides and to develop plans to mitigate the risk of landslides. The IRS satellites have also been used to map water bodies, monitor river flows, and assess the impact of floods and droughts. This information has been used to develop plans to manage Water Resources and to mitigate the effects of floods and droughts. The IRS satellites have also been used to map urban areas, monitor urban growth, and assess the impact of development. This information has been used to develop plans to manage urban growth and to mitigate the impact of development.
The IRS satellites have been a valuable tool for a variety of applications. They have provided high-quality data that has been used to improve the lives of people around the world.
What is a satellite?
A satellite is an object that orbits, or circles, a planet or other celestial body. Earth has one natural satellite, the Moon. Humans have also launched artificial satellites into orbit around Earth. These satellites are used for a variety of purposes, including communications, weather forecasting, and navigation.
What is remote sensing?
Remote sensing is the science of obtaining information about an object or area from a distance, typically by using satellites or aircraft. Remote sensing data can be used to map land cover, monitor changes in the environment, and track the movement of people and objects.
What are the different types of remote sensing satellites?
There are two main types of remote sensing satellites: passive and active. Passive satellites detect energy that is naturally emitted by the Earth or its Atmosphere. Active satellites emit their own energy and then detect the reflected or scattered energy.
What are some of the benefits of using remote sensing satellites?
Remote sensing satellites can provide a wealth of information about the Earth and its environment. This information can be used for a variety of purposes, including:
- Mapping land cover: Remote sensing data can be used to create maps of land cover, which can be used for planning and development.
- Monitoring changes in the environment: Remote sensing data can be used to monitor changes in the environment, such as deforestation, Desertification, and Climate change.
- Tracking the movement of people and objects: Remote sensing data can be used to track the movement of people and objects, such as vehicles and ships.
What are some of the challenges of using remote sensing satellites?
One of the main challenges of using remote sensing satellites is that they can only provide a two-dimensional view of the Earth. This can make it difficult to accurately assess the three-dimensional shape of objects or areas. Additionally, remote sensing data can be affected by clouds and other atmospheric conditions, which can make it difficult to obtain clear images.
What are some of the future trends in remote sensing?
One of the most promising future trends in remote sensing is the development of hyperspectral satellites. Hyperspectral satellites can collect data at a much higher resolution than traditional satellites, which can be used to create more detailed maps and images. Additionally, hyperspectral data can be used to identify specific materials, which can be used for a variety of applications, such as mineral exploration and environmental monitoring.
What are some of the ethical issues surrounding the use of remote sensing satellites?
One of the most significant ethical issues surrounding the use of remote sensing satellites is the potential for privacy invasion. Remote sensing satellites can collect data about people and their activities without their knowledge or Consent. This data could potentially be used to track people’s movements, monitor their activities, or even identify them.
Another ethical issue surrounding the use of remote sensing satellites is the potential for misuse. Remote sensing data could be used to target people or areas for military or other purposes. Additionally, remote sensing data could be used to exploit natural resources or to damage the environment.
It is important to be aware of the ethical issues surrounding the use of remote sensing satellites. It is also important to use remote sensing data in a responsible and ethical manner.
Sure, here are some MCQs without mentioning the topic Indian Remote Sensing (IRS) Satellites:
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Which of the following is not a type of remote sensing?
(A) Optical remote sensing
(B) Radar remote sensing
(C) Thermal remote sensing
(D) IRS remote sensing -
Which of the following is the most common type of remote sensing?
(A) Optical remote sensing
(B) Radar remote sensing
(C) Thermal remote sensing
(D) IRS remote sensing -
Optical remote sensing uses which of the following wavelengths of Light?
(A) Visible light
(B) Near-infrared light
(C) Mid-infrared light
(D) All of the above -
Radar remote sensing uses which of the following wavelengths of light?
(A) Microwaves
(B) Radio waves
(C) Both microwaves and radio waves
(D) None of the above -
Thermal remote sensing uses which of the following wavelengths of light?
(A) Infrared light
(B) Microwaves
(C) Radio waves
(D) None of the above -
Remote sensing can be used for which of the following applications?
(A) Land use mapping
(B) Vegetation monitoring
(C) Water Resources Management
(D) All of the above -
Which of the following is a disadvantage of optical remote sensing?
(A) It can only be used during the day
(B) It is not as good at penetrating clouds as radar remote sensing
(C) It is not as good at detecting changes in surface temperature as thermal remote sensing
(D) All of the above -
Which of the following is a disadvantage of radar remote sensing?
(A) It cannot be used to detect fine details on the surface
(B) It can be affected by atmospheric conditions
(C) It can be difficult to interpret the data
(D) All of the above -
Which of the following is a disadvantage of thermal remote sensing?
(A) It can only be used at night
(B) It is not as good at detecting changes in surface reflectance as optical remote sensing
(C) It is not as good at detecting changes in surface elevation as radar remote sensing
(D) All of the above -
Which of the following is the most common type of remote sensing satellite?
(A) Optical remote sensing satellite
(B) Radar remote sensing satellite
(C) Thermal remote sensing satellite
(D) All of the above
I hope these MCQs are helpful!