GTECH 709 Geographic data Georelational principle again Geographic
- Slides: 5
GTECH 709 Geographic data Geo-relational principle - again Geographic data organization Back to the map
What is Geographic Data? • Following the geo-relational principle, geographic data has to have – A locational reference • Check for yourself about all the different ways we can specify a location – Data that describes what can be found at that location: • Income, temperature, party affiliation, soil type, etc.
Geographic Data Organization • We will have whole sessions on this • Location and attributes in one file Latitude Longtitude Precisio Address n City London State ZIP Name Description UK EC 2 V 6 GIS Cloud Web-based GIS 51. 514 -0. 0936 Address 109 Cheapside 38. 967 -77. 380 Address 555 Grove St Herndon VA 20170 Juice Analytics. Data analysis 37. 416 -122. 02 Address 701 First Ave Sunnyvale CA 94089 Yahoo Address matching 37. 423 -122. 08 Address 1600 Mountain View. CA Amphitheater Pkwy 94043 Google Earth 47. 643 -122. 13 Street One Microsoft Redmond Way WA 98052 Microsoft Excel 41. 132 -73. 704 City 1 New Orchard Rd NY 10504 IBM You tell me Armonk
Geographic Data Organization • Location and attributes in multiple files – ESRI “shapefile” – A collection of. shp, . dbf, . shx files • Location and attributes in a database (file) – ESRI geodatabases – Post. GIS database • Web services
Back to the Map • A digital map is a set of instructions on how to arrange visual representations of geography • Items such as a Google map or a satellite image may serve as context • We can turn map layers on or off • Label map elements • Change appearances
