Passive Sensors: Depend on an external energy source like sunlight (e.g., Landsat, Sentinel).

Active Sensors: Emit their own signal and measure its return ( RADAR, LiDAR).

Energy Source: Typically the sun (in passive systems).

Interaction with Surface: Solar energy interacts with the Earth's surface and is reflected.

Sensor Detection: Sensors measure the reflected energy at various wavelengths.

Processing y Analysis: The collected data is processed to generate images, maps, and metrics for analysis.

Optical (RGB, infrared, multispectral): Detect visible and near-infrared light.

Thermal: Detect heat emitted from the Earth's surface.

Radar (SAR): Can penetrate clouds and vegetation, useful for structural and elevation data.

Agriculture: Crop monitoring, pest detection.

Environment: Deforestation, forest fires, biodiversity tracking.

Geology: Mapping minerals, faults, and formations.

Climate Science: Studying global climate change, weather phenomena.

Cartography: Creating and updating geographic maps.

Disaster Management: Monitoring floods, earthquakes, oil spills, etc.

Large-area topographic surveys

Design and planning of civil works: roads, dams, bridges.

Watershed and drainage modeling

Landslide and subsidence monitoring

Detailed topographic cartography

Volume estimation in mining and construction sites