PLAN281 Lecture Notes - Lecture 7: List Of Bluetooth Profiles, Computer File, Centroid
Document Summary
The raster model divides the geographic area into a regular grid of cells in specific sequence: identified by row and column. Conventional sequence is row by row from the top left corner: each cell contains a single attribute value, space-filling every location corresponds to a cell in the raster. Regular tessellation (division of space) can be conceptualized as a matrix-like series of cells. Feature co-ordinates are implicit: grid origin usually upper left corner, grid resolution minimum linear dimension of the smallest unit of geographic space samples. Attributes are explicit: often only a single attribute is assigned to a cell, otherwise, a key" identifier in each cell links to related database files containing multiple attributes for each grid cell. Raster models do not provide explicit locational information. Raster orientation angle between real world north and north direction defined by raster columns.