GEOG 7 Lecture Notes - Lecture 3: Centimorgan, Granularity, Sql
Document Summary
Maps and map types: input and output of gis: artistic, scientific, aid understanding of processes, clarify understanding of topic, historical, trusted information, people will be more tuned with maps due to democratization of info and resources available. What is a map: representation of the world: place, feature, pattern etc, varied media: mental, physical, digital. Within gis: reference maps: locate features on earth | geographic features represented equally , e. g. But that is not true: dynamic maps: changeable and interactive. Large scale: large areas like countries | small scale: small areas like cities and neighborhoods | Figments of our imagination and dynamic: global and local are not mutually exclusive with intermediate scales. Cartographic scale aka map scale: representative fraction (rf); a ratio between map distance and earth/ground distance: unit-less measure: can be 1in:24000in or 1cm:24000cm. Data measurement scales: nominal/categorical: descriptors e. g. is land urban or rual, ordinal: categorical + ranking.
