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A collaboration of the University of Minnesota's Remote Sensing and Geospatial Analysis Laboratory and Water Resources Center

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Remote sensing is the science of obtaining information about an object or area through the analysis of measurements made at a distance from the object (i.e., not coming in contact with it).

The oldest form of remote sensing is aerial photography where the sensor system is the camera and film.  More recently, the field of remote sensing has grown to include electro-optical sensors which acquire multispectral digital images that can be processed and analyzed by computers.  Many of these sensors are on satellites which regularly orbit the earth.

The quantity most frequently measured and recorded in images is the electromagnetic energy reflected by the object.  The source of the electromagnetic energy is the sun and the spectral reflectance properties of many Earth surface features, such as soil, vegetation and water, can be used to uniquely identify and characterize them.

For this project, we obtained information about water resources through the analysis of images acquired from satellite sensors that orbit about 400 miles above the earth's surface.

The Electromagnetic Spectrum

The Electromagnetic Spectrum

How Satellite Imagery Works

How Satellite Imagery Works

 

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