Gis Concepts 2/5

Concepts and Functions of Geographic Information Systems (2/5) 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

Modelling of geographic reality ,[object Object],[object Object],[object Object],[object Object]

Modelling of geographic reality with GIS ,[object Object],[object Object],[object Object]

Spatial data modelling with GIS

The gDB as a spatial model ,[object Object],[object Object],[object Object],[object Object]

The gDB as a spatial model ,[object Object],[object Object],[object Object],[object Object],[object Object]

Geographic database Geodataset 1 Geodataset 3 Geodataset 2 X Y

Two types of geodatasets ,[object Object],[object Object],[object Object]

Vectorial versus cell-based spatial entity modelling

The vectorial data structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Cell-based equivalent of vectorial objects

The RASTER data structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Spatial resolution of raster-geodatasets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Vectorial versus cell-based objects Vector ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Vectorial versus cell-based objects Raster ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Vector-to-Raster and Raster-to-Vector-conversion ,[object Object],[object Object]

Spatial (entity) modelling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Each gDB contains a reference geodataset (a base map) ,[object Object],[object Object]

Geographic database polygon line point TIN categoric raster image lattice X Y

Sources of data for geodatasets ,[object Object],[object Object]

Sources of data for geodatasets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Documentation of available geo-datasets ,[object Object],[object Object],[object Object],[object Object],[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]

Questions or remarks ? Thank you …

Gis Concepts 2/5

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Gis Concepts 2/5