===== TerraView 5.x - Main concepts and its correspondence in previous version =====

The new concepts adopted in TerraLib/TerraView 5.x are summarized here in a way users of TerraView 4.2.2 will quickly understand what to get when converting a database created in previous version to TerraView-5.x.

|**From: TerraView 4.2.2**| **To: terraView 5.x**| **Rationale**|    
|         |DataSource |Data Source is a location from where to pick up data (Postgis Database,  Microsoft Access Database, Directory of Vector files, Directory of Raster files and URL)|
|         |Connector|It is used to registry an existing datasource (or to create an empty one) into a file called ''datasource.xml'' |
|         |Project File (*.tview) |It keep a list of all DataSources registered and for each Layer it keep a reference to a dataset, SRID and style of visualization (point/line/polygon style)|
|         |Layer Explorer |It lists all Layers referenced in a Project|
|Projection|SRID| It is a code given by EPSG to each known projection |
|Infolayer-Vector|Vector Dataset |It is a dataset stored into the datasource defined by the user|
|Infolayer-Raster|Raster Dataset |It is a raster file stored in a Directory defined by the user (outside the database)|
|Tabular Layer|Tabular|It is a dataset stored into the datasource defined by the user|
|External Tables|Tabular|It is a dataset stored as a tabular layer into the datasource defined by the user|
|View|Map Display|A ''View'' can be compared to the ''Map Display'' (the view projection is the Map Display SRID adopted to visualize all layers)|
|Theme|Layer|Layer showed in a Map Display (reprojected to the Map Display SRID)|
|Theme Visual|Layer Style|The Visual concept is the Layer Style stored inside the Project file|


The diagram bellow shows the main concepts adopted and the relationship between them.

{{:wiki:schema_tview.jpg}}