GEOG 2420 Study Guide - Midterm Guide: Sea Surface Temperature, Photographic Film, Primary Color
6 Dec 2014
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Document Summary
Geomatics: discipline of gathering, storing, processing, and delivering geographic information. Remote sensing: acquisition of data about something without making physical contact with it (sensing & recording reflected/emitted energy and processing, analyzing, & applying that info) Examples of different remote sensing platforms: aircraft, drones, truck (with crane), hot air balloon (popular early method), pigeon (small camera), and now satellites. Active rs propagates its own energy towards target & receives info back (lidar, radar) Passive rs just captures energy coming from object (e. g. photography, radiometry, infrared) Digital image (electronic sensors): pixel represents an area & has an intensity (measured physical quality represented as digital #, electronic photo detectors (charge coupled devices) capture light & convert to electric signals. Raster - gridded cells representing geographic coverage, varying sizes (spatial resolution), pixels form a digital image ( raster is faster but vector is corrector ) Vector - used in gis, digital geometry features, points/polygons/lines.
