GEOB 270 Lecture Notes - Lecture 4: Arcgis, Open Data, North American Datum
14 Sep 2018
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Document Summary
Topology: gis has intelligence in the lines and the points (unlike illustrator, that only has vectors that are "dumb data" Vector topology: defines vector features by their relationship to. Other features, it is critical to gis analysis because it allows you to work with containment/connectivity and adjacency. Containment: can calculate the area of polygon shapes (this is something that you cannot do in adobe illustrator) Connectivity: when you have connectivity through the lines, e. g. a flow of a resource through a linear network (e. g. Connectivity: when you have connectivity through the lines, e. g. a flow of a resource through a linear network (e. g. the flow of water downstream), these lines are intelligent (i. e. they have a direction to them) Adjacency: when you look at where to plant or harvest trees, certain regulations prevent you from harvesting trees if they are near the ones that were planted within the last 5 years or a certain height.
