Lecture 05: Spatial Data Structure as long as Computer Cartography Geography 128 Analyt

Lecture 05: Spatial Data Structure as long as Computer Cartography Geography 128 Analyt

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One Dimensional Objects Divide up by lines with in addition to without topological significance Primitive object is the segment Segments connect to make a string (line or polyline) If defined mathematically, use arc If line segment connects nodes, called a link ( as long as a network) Topological versions carry end node in addition to or left in addition to right polygon data Complete, area in addition to network chain versions Area-like objects are G-ring in addition to GT-ring One Dimensional Objects Two Dimensional Objects Interior area is the space contained by the polygon, i.e. the object not the boundary G-polygon contains graphical objects that as long as m a polygon, e.g. a ring GT-polygon contains complete topology Toplogical encoding requires universe in addition to void polygons. Special objects pixel (the smallest non-divisible element of a digital image) Grid cell (same as pixel but as long as a grid)

Aggregate Objects DIGITAL IMAGE two dimensional array of regular pixels Aggregate Objects (cnt.) GRID Set of grid cells as long as ming a regular or near regular tesselation Aggregate Objects (cnt.) LAYER Distributed set of spatial data representing entity instances within on theme, or with a common attribute. Usually registered with other layers.

Aggregate Objects (cnt.) RASTER One or more overlapping layers from the same grid or digital image. Aggregate Objects (cnt.) GRAPH Planar Graph: Node in addition to link/chain set as applied to a plane surface Two-dimensional Manifold: Planar graph with all included objects Network A graph without two-dimensional objects (links do not have to intersect) Limitations Three dimensional objects time-sensitive objects Links to other st in addition to ards Implementation slow via profiles Next Lecture Map Data Structure

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