GEOG 7 Lecture Notes - Lecture 6: Spatial Analysis, Quadtree
Document Summary
Data models: set of rules used to describe and represent the real world in a digital environment. Need to be explicit, consistent and precise. Thresholds for inclusion/exclusion: logical: formalize definitions and measures, digital: define and describe features using concepts and logical defined previously. Types of models: cad; raster; vector; spaghetti, topological. Continuous: subtle variations across space; not a hard-and-fast boundary. Geometric form: points, lines, polygons | nested within each other. All lcd monitors are based on raster technology because they are composed of a set number of raster pixels. Tend to be large however; less pretty than vector counterparts; problems with reprojection. Spatial resolution: area covered by each pixel: size of the smallest feature that can be detected in an image, overly fine pixel resolution will result in increase in file size which computer might not be able to handle. Coordinates to represent spatial features: vector types: polygons.
