Gis Concepts 1/5

Concepts and Functions of Geographic Information Systems (1/5) MSc GIS - Alexander Mogollon Diaz Department of Agronomy 2009

Concepts and Functions of GIS .PPT Topic #1 Topic #2 Topic #3 1 A GIS is an information system GIS is a technology 2 Spatial Data modelling Sources of data for geodatasets Metadata 3 Geo-referencing Coordinate transformations 4 Database management 5 Spatial Analysis

Maps ,[object Object],[object Object],[object Object],[object Object]

Maps ,[object Object],[object Object],[object Object],[object Object],[object Object]

Plans / Sketches ,[object Object]

Spatial databases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

From data collection to database A/D conversion Structuring Computing functions Other functions Data collection Database Information System

From data collection to database ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data about entities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Database = structured collection of digital data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

From database to information system

From database to information system ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],What ? Wen ? What if ?

Information system ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Questions about entities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],What if taxes rise with 10% ? What deficit if #students decrease to 25.000 ?

From database to information system ,[object Object],[object Object],[object Object],[object Object]

From maps and other collections of spatial data to GIS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],What ? When ? What if ? WHERE ?

Spatial entities (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Spatial entities (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Spatial entities (3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

From data on spatial entities to spatial information ,[object Object],[object Object],[object Object],[object Object]

Spatial entities and spatial objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Y X 6045 Identification Name 6045 Land Use

Y X 101 Building 101 Name Identification

Y X A00233 99-nov-16t A00233 Date Identification

The real world = spatial entities + ??

Terrain ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

From spatial database to GIS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],What ? When ? What if ? WHERE ?

gDB contains data about spatial entities and/or terrain ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data in a gDB must be structured and interpreted ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example of geometric structuring Y X Points are structured into lines which define 2D-polygons

Example of geometric structuring Points/cells are structured into 2.5D surfaces

Data in a gDB must be structured and interpreted ,[object Object],[object Object],[object Object]

Geographic databases ,[object Object],[object Object],[object Object],[object Object],[object Object]

GI-Systems ,[object Object],[object Object],[object Object]

Generic questions for a GIS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

GIS = IS GIS = TECHNOLOGY to build and exploit gDBs Spatial data modelling

GIS = IS GIS = TECHNOLOGY to build and exploit gDBs Management Transformation Visualisation, Query, Cartography Analysis

GIS as a technology ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary of important items ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Questions or remarks ? Thank you …

Gis Concepts 1/5

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Gis Concepts 1/5