What is remote sensing?

Remote sensing is measuring and observing the Earth's surface from a distance — satellite, aircraft, drone — without physical contact. Sensors record visible light, infrared, radar, or LiDAR.

Outputs: orthophoto, multispectral images for land use and crop monitoring, elevation models (DEM) from LiDAR. In GIS remote sensing data loads as raster for classification and change detection.

Remote sensing is not narrow aerial photography alone or field survey on site. It delivers large-scale, repeatable observations; resolution and spectral bands determine what you can detect.