Knowra Satellite imagery Satellite imagery Satellite imagery consists of images of Earth collected by sensors carried on satellites. It reveals surface features and changes across large areas, often in wavelengths beyond visible light.
Remote sensing : The collection of information about objects or areas without physical contact, often using sensors that detect reflected or emitted energy. Satellite imagery is one form of remote sensing, alongside airborne and ground-based measurements.
Land-cover change : The conversion or alteration of Earth's surface cover, such as forest becoming farmland or urban area. Repeated satellite images reveal where and when surface cover changes.
Image classification : The assignment of image pixels or regions to categories based on their measured properties. Classification turns satellite measurements into maps of land cover or other surface types.
Aerial photography : Photography of Earth's surface from aircraft or other airborne platforms. Aircraft can capture finer detail and flexible timing, while satellites provide repeat coverage over larger areas.
Electromagnetic spectrum : The full range of electromagnetic radiation, from radio waves through visible light to gamma rays. Satellite sensors select wavelengths from this spectrum to distinguish materials and conditions on Earth.
Precision agriculture : Farm management that uses spatial data to tailor decisions to variation within fields. Satellite observations help estimate crop vigor and target field inspections or inputs.
Geographic information system : A system for storing, analyzing, and displaying data linked to locations on Earth. GIS combines imagery with boundaries, roads, and other geographic data.
Lidar : A remote-sensing method that measures distance by timing reflected laser pulses. Lidar produces precise elevation and structure measurements rather than conventional reflected-light images.
Multispectral imaging : Imaging that records separate measurements in several discrete wavelength bands. Comparing bands can reveal vegetation, water, and surfaces that look similar in ordinary photographs.
Disaster response : The organized actions taken to protect people and restore services after a hazardous event. Images can map flood extent, wildfire scars, and damaged infrastructure over broad areas.
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