GPHY 243 Study Guide - Midterm Guide: Simple Random Sample, Stratified Sampling, Census Block
5 Dec 2015
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The six gis sub industries: software industry, data industry, giservice industry, geoweb service industry, publishing industry, gis education. Creation: point attribute values, user defined classes, interpolation of class boundary between points, addition and labelling of other class boundaries, use of hue to enhance perception of trends, choropleth: depicts quantities in discrete data, always polygons. Oblate ellipsoid (spheroid): earth is not a perfect circle: earth"s ellipsoid is only 1/298 off from a sphere, clarke 1866: used in na, grs80 (geodetic reference system)= adopted in na for 1983 earth centred coordinate system (satellite, wgs84 (world geodetic system)= gps and by nasa. Different projects enable us to produce maps with specific uses: conformal: projection preserving the shape, useful for navigation, equal area/equivalent: preserves the area of a feature, equidistant: preserve distance between some parts of the map, azimuthal: projections preserve true distance, cadasters.
