If you're having trouble, want to report a bug, provide a suggestion, or just want to say hello — please fill out the form below. If you're having trouble, want to report a bug, provide a suggestion, or just want to say hello — please fill out the form below. non-spatial info about a geographic feature, usually stored in a table and linked to the feature with a unique identifier distinguishes one entity from another, all contents are equal: eg farmers name who collected the data, driver's license # touching the Earth with a flat sheet of paper (Lambert Azimuthal Equal Area), good for global views, preserve true direction distance from user to satellite (light-speed signals, time * speed of light = distance), time for radio signal to get from satellite to user slowdown of radio signals caused by the ionosphere/troposphere, ground reflection, errors by the satellite, causes greater distortion fixed GPS station at a known location, record the microwave signals as distance changes b/w you and the satellite (very technical) drum scanners (commercial use), slide scanners (for slides), handheld wands (poor quality but useful), flatbed scanners (common kind), digital camera Source.


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Last Modified: April 23, 2016 @ 5:07 pm