GPHY 243 Chapter 1-10: GPHY 243 Readings
5 Dec 2015
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Continuous geographic features: phenomena continuously existing in the landscape, scientists collect measurements of variables (humidity, elevation etc) at discrete point locations and then interpolate the data to ll a grid! Points are stored according to their unique x and y coordinates, best to use this format! A line is simply an assemblage of connected points (the beginning, n intermediate points. A polygon is created when the beginning and ending points of at least three line and an end point)! segments have the same coordinate values: raster (matrix) data structure! resulting in a lack of precision! The process can change the point symbol to a square picture element (a pixel)! Pixels are made the same size in x and y directions (ex. Unless performed at a high spatial resolution, this plays havoc with linear features, Ideal for storing spatial information about continuous data such as temperature! Aspatial data: has no geographic information associated with them (ex. age or height)!
