GEOG 5 Lecture Notes - Lecture 5: Spheroid, Lidar, Stax Records
Document Summary
Geog 5 notes: large scale shows less area & more details, reference map- topographic: shows where things are w/lines (terrain, no maps present the complete truth, maps must use: Simplification- selective presentation; decide what to present to viewer. Projection- distortion can lead to false sense of reality. We have continuity but lose correctness in shape, distance, direction & area: appropriate visualization of data. Mercator projection and mollweide (equal area; preserves area but distorts shape: remote sensing: collecting info about earth"s surface through aerial photography (like from a plane) or satellite imagery (ex: aerial view of. Passive sensors: gather natural radiation that"s emitted/reflected by object or surrounding areas (film photography, radiometers) sun reflects on earth & that light reflects back onto satellite. Active sensors: emit energy to scan objects & areas, then detect & measure radiation reflected or backscattered from target (radar, lidar) satellite sends out signal, hits earth surface & then satellite records signal.
