PPT: Remote Sensing | Geomatics Engineering (Surveying) - Civil Engineering (CE) PDF Download

 Page 1


Remote Sensing
A comprehensive exploration of remote sensing technologies, 
applications, and principles for civil engineering applications.
Page 2


Remote Sensing
A comprehensive exploration of remote sensing technologies, 
applications, and principles for civil engineering applications.
What is Remote Sensing?
Definition
The science of acquiring information about Earth's surface 
without physical contact.
Platforms
Data collection via satellites or aircraft.
Mechanism
Information gathered through electromagnetic radiation 
detection.
Page 3


Remote Sensing
A comprehensive exploration of remote sensing technologies, 
applications, and principles for civil engineering applications.
What is Remote Sensing?
Definition
The science of acquiring information about Earth's surface 
without physical contact.
Platforms
Data collection via satellites or aircraft.
Mechanism
Information gathered through electromagnetic radiation 
detection.
Basic Principle of Remote Sensing
Energy Source
Sun (passive) or sensor itself (active)
Surface Interaction
Energy interacts with Earth's surface features
Detection
Sensor captures reflected or emitted energy
Processing
Data transmission and computational analysis
Output
Visual representations as images or maps
Page 4


Remote Sensing
A comprehensive exploration of remote sensing technologies, 
applications, and principles for civil engineering applications.
What is Remote Sensing?
Definition
The science of acquiring information about Earth's surface 
without physical contact.
Platforms
Data collection via satellites or aircraft.
Mechanism
Information gathered through electromagnetic radiation 
detection.
Basic Principle of Remote Sensing
Energy Source
Sun (passive) or sensor itself (active)
Surface Interaction
Energy interacts with Earth's surface features
Detection
Sensor captures reflected or emitted energy
Processing
Data transmission and computational analysis
Output
Visual representations as images or maps
Types of Remote Sensing
Passive Remote Sensing
Uses natural energy sources like sunlight. Sensors 
detect naturally reflected or emitted radiation.
Examples: Optical sensors
Landsat, MODIS, Sentinel-2
Limited to daytime use
Active Remote Sensing
Emits its own energy and measures the returned 
signal. Functions day or night.
Examples: RADAR, LiDAR
RADARSAT, TerraSAR-X
Can penetrate clouds
Page 5


Remote Sensing
A comprehensive exploration of remote sensing technologies, 
applications, and principles for civil engineering applications.
What is Remote Sensing?
Definition
The science of acquiring information about Earth's surface 
without physical contact.
Platforms
Data collection via satellites or aircraft.
Mechanism
Information gathered through electromagnetic radiation 
detection.
Basic Principle of Remote Sensing
Energy Source
Sun (passive) or sensor itself (active)
Surface Interaction
Energy interacts with Earth's surface features
Detection
Sensor captures reflected or emitted energy
Processing
Data transmission and computational analysis
Output
Visual representations as images or maps
Types of Remote Sensing
Passive Remote Sensing
Uses natural energy sources like sunlight. Sensors 
detect naturally reflected or emitted radiation.
Examples: Optical sensors
Landsat, MODIS, Sentinel-2
Limited to daytime use
Active Remote Sensing
Emits its own energy and measures the returned 
signal. Functions day or night.
Examples: RADAR, LiDAR
RADARSAT, TerraSAR-X
Can penetrate clouds
Electromagnetic Spectrum in Remote 
Sensing
Visible Spectrum
0.4-0.7 ¿m wavelength range. 
Captures what human eyes can 
see.
Infrared Region
0.7-100 ¿m. Detects heat and 
certain material properties.
Microwave Band
1 mm-1 m. Penetrates clouds. Used 
in radar systems.
Spectral Signatures
Unique reflection patterns that 
identify different surface 
materials.