- "Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object, in contrast to in situ or on-site observation."
The gathering of data from a distance, such as from satellites, to gather information about the environment.
Basics of Remote Sensing: This includes understanding the principles of remote sensing, electromagnetic spectrum, sensors and their types, and various platforms.
Data Acquisition: This includes identifying, selecting and acquiring remotely sensed data from various platforms such as satellites, aircraft, and UAVs.
Data Pre-processing: This includes image enhancement techniques such as filtering, atmospheric correction, radiometric correction, and georeferencing.
Image Classification: Image classification techniques are used to identify and label different land cover and land use types such as vegetation cover, water bodies, and urban areas.
Change Detection: Change Detection techniques are used to analyze and identify changes in land use and land cover over time, such as deforestation or urban expansion.
Data fusion: The process of combining multiple data sources, such as satellite imagery and field surveys, to improve the accuracy of analysis.
Hydrological Modeling: Hydrological models are used to estimate water budget, runoff, and hydrological processes using remotely sensed data along with rainfall and climatic data.
Flood Mapping: Remote sensing is widely used to map flood extent, depth, and severity by using data from Synthetic Aperture Radar (SAR) or optical and thermal sensors.
Soil Moisture Mapping: Remote sensing is useful in mapping soil moisture, which is critical for water resources management and crop production.
Evapotranspiration: Remote sensing can be used to estimate evapotranspiration, which involves the loss of water to the atmosphere via transpiration and evaporation from the Earth's surface.
Vegetation Indices: Various Vegetation Indices are used to quantify vegetation cover, health, and productivity.
Snow Cover Mapping: Remote sensing is used to map seasonal snow cover extent, depth, and persistence.
Drought Monitoring: Remote sensing can provide information on drought intensity, duration, and spatial extent as well as monitor crop yield loss.
Mapping Water Quality: Remote sensing is widely used to map water quality parameters like turbidity, chlorophyll-a, and Total Suspended Solids (TSS).
Glacier Monitoring: Remote sensing is used to monitor glacier change, mass balance, and glacier volume changes.
Oceanography: Various remote sensing techniques are used to map ocean currents, sea surface temperature, and ocean productivity.
Wetland Mapping: Remote sensing is used to map wetland ecosystems and monitor their changes.
Land Degradation: Remote sensing is useful in identifying and mapping land degradation caused by various human activities such as deforestation, mining activities, and urbanization.
Passive Remote Sensing: This involves the measurement of natural radiation emitted or reflected by the Earth's surface, such as sunlight or thermal infrared radiation. This type of remote sensing can provide information on the distribution of temperature, vegetation, and the presence of water.
Active Remote Sensing: Active remote sensing involves the use of an energy source to create an electromagnetic signal that is then reflected back to a receiver. Examples of active remote sensing include RADAR and LiDAR. This type of remote sensing can provide information on topography, vegetation, and the location of water bodies.
Thermal Remote Sensing: This type of remote sensing uses the thermal signature of objects to provide information on their temperatures. Thermal remote sensing can be used to detect water temperature, flow rates, and groundwater seepage.
Microwave Remote Sensing: Microwaves are used in remote sensing to penetrate through clouds and vegetation to gather information about the Earth's surface. This type of remote sensing is particularly useful for studying the moisture content of soil and vegetation.
Optical Remote Sensing: Optical remote sensing involves the use of visible, near-infrared, and infrared light to gather information about the Earth's surface. This type of remote sensing is commonly used to map land cover, vegetation, and water quality.
Hyperspectral Remote Sensing: This type of remote sensing uses a large number of narrow spectral bands to gather detailed information about the Earth's surface. Hyperspectral remote sensing can be used to identify different types of vegetation and minerals.
Radar Remote Sensing: Radar remote sensing uses microwaves to measure the backscatter of energy from the Earth's surface. This type of remote sensing can be used to map topography, monitor land movement or deformation, and measure ocean surface roughness.
LiDAR Remote Sensing: LiDAR uses laser pulses to measure the distance between the Earth's surface and the sensor. This type of remote sensing can be used to map topography, measure forest height, and detect the presence of buildings or other structures.
- "Remote sensing is used in numerous fields, including geophysics, geography, land surveying, and most Earth science disciplines."
- "Exploration geophysics, hydrology, ecology, meteorology, oceanography, glaciology, geology"
- "It also has military, intelligence, commercial, economic, planning, and humanitarian applications, among others."
- "The term remote sensing generally refers to the use of satellite- or aircraft-based sensor technologies to detect and classify objects on Earth."
- "It includes the surface and the atmosphere and oceans, based on propagated signals."
- "Active remote sensing is when a signal is emitted by a satellite or aircraft to the object and its reflection detected by the sensor." - "Passive remote sensing is when the reflection of sunlight is detected by the sensor."
- "The term is applied especially to acquiring information about Earth and other planets."
- "It includes the surface and the atmosphere and oceans, based on propagated signals (e.g. electromagnetic radiation)."
- "It may be split into 'active' remote sensing and 'passive' remote sensing."
- "Active remote sensing is when a signal is emitted by a satellite or aircraft to the object and its reflection detected by the sensor." - "Passive remote sensing is when the reflection of sunlight is detected by the sensor."
- "The term remote sensing generally refers to the use of satellite- or aircraft-based sensor technologies to detect and classify objects on Earth."
- "It includes the surface and the atmosphere and oceans, based on propagated signals (e.g. electromagnetic radiation)."
- "Exploration geophysics, hydrology, ecology, meteorology, oceanography, glaciology, geology"
- "It also has military, intelligence, commercial, economic, planning, and humanitarian applications, among others."
- "Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object, in contrast to in situ or on-site observation."
- "The term is applied especially to acquiring information about Earth and other planets."
- "Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object."
- "Remote sensing is used in numerous fields, including geophysics, geography, land surveying and most Earth science disciplines."
- "Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object, in contrast to in situ or on-site observation."