GEOB 270 Lecture Notes - Lecture 8: Lidar, Point Cloud, Bathymetry
25 Dec 2016
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Document Summary
Internal data structure that relates different parts of data. There are (cid:374)o (cid:858)holes(cid:859) or (cid:858)isla(cid:374)ds(cid:859) that are (cid:374)ot the(cid:373)selves features. Every feature is represented as a record in the attribute table: topology: objects store information about their relationship with their neighbors (adjacency, connectivity, intersection) Three special spatial entities: tin (triangulated irregular networks) Built using vips (very important points peaks, pits and break lines {cliffs, roadways, rivers, lake shores}) Topological model that stores elevations at the nodes, and associates slope with edges and triangular faces. Three nodes defining the triangle x,y coordinates of each node. Edge type of each triangle edge: networks. Another special case of vector topological data structure. Arc node arc relations: turn tables (can you turn left/right, go straight) Arcs: directionality (one way, two way, speed limit) Route analysis: couriers, emergency vehicles, garbage collection, gps(navigation) Hydrological analysis: flow of water through river system, model utility systems, lidar (light detection and ranging)
