Geographic Information System…with a spatial component…for capturing, managing, analyzing and understanding information…A set of software, hardware and data…
Geographic Information System…with a spatialGIS integrates A component hardware, software and data to capture, manage,…for capturing, managing, analyzing analyze and visualize and understanding information… any kind of information with a geographic component.A set of software, hardware and data…
«You do not really understand somethingunless you can explain it to your grandmother.» Albert Einstein Theoretical Physicist, unfortunately not related to GIS
Redefining your view of GIS Population Unemployment Income
GIS defined by its use Workflow and productivity improvement Build up a reference information base Efficiency improvement Decision-making support Performance and accounting measurement support Generation of revenue Social content
GIS modelling our world Restaurants Hotels Streets Roads Rivers Parcels Vegetation Water bodies Elevation Imagery Reality
Conceptual workflow Geometry Data Parcel No. Type Address Rules 9856101 C López de Hoyos 9856102 C Antonio Salces 9856103 A América 9856104 P Prosperidad 9856105 C Luis Cabrera 9856106 C Santa Hortensia
The Data • A single data repository: the Geodatabase • Every geographic dataset, business logic and behavior
The Map • A set of geometric features that represents a geographic reality. • A ‘window’ for exploring the data.
The Model • Analysis tools that creates new geographic information from existing data.
In short, a GIS is… An information system (hardware, software, data) which enables us to apply lots of analysis models to any geographical datasets for generating derived information that can be visualized as maps. “ A Geographic Information System helps us understand our world, answer questions about our environment and support us during decision-making.
Using spatial data –the traditional way ArcGIS Desktop ArcGIS Explorer Services Files Databases
Using spatial data –the traditional way ArcGIS Desktop ArcGIS Explorer Client Level Data Level Services Files Databases
Data Layers Topologic integration Fire risk Data
Topology • Branch of mathematics that studies geometry from a qualitative perspective. • Topology describes the geometric relationships of a given space. “ A topologist is someone that can’t distinguish between a cup of coffe and a doughnut Data
Topology in our GIS • Defines the way different point, line or polygon layers relate each other geometrically. Two contour lines can’t intersect Two parcels can’t overlap Buildings must be within parcels Data
Behavior in our GIS • Geometric features may have properties that represent geographic objects. Street network (edges, junctions, turns, impedances) Cadaster (parcels, boundaries, nodes ) Data
Where to find data • ArcGIS.com - Free basemaps - Map templates - User Services - Data packages - Social Network • resources.esri.com - Code samples - References & Forums - Online Help Data
A GIS is… An information system (hardware, software, data) that allows us to apply lots of analysis models to any set of geographic data in order to generate derived information that can be explored as a map.
Geographic Information Systems… …help us understand reality… …answer questions about our world……and support us during decission-making.