Layer
Explorer
The
Layer Explorer area of the Main Window shows all layers previously
added to the project. To draw one or more layer at the Map
Display, check
its box and click on 
or on 
The Spatial Reference System (
)of the Map Display
showed at the status bar is the first valid SRID among the layers checked. It is also
possible
to set a specific Map Display SRID by right-clicking over
the Map Display area
as explained here. To find out
the layer-SRID, right-click over a
layer name and
choose Properties....
Each layer
can be in one of the these status:
- disconnected (
)
- when the data source containing the layer is disconnected or the
location path changed. In this case right-click over the layer name and
choose Change Layer Data Source
and the right interface will come up to reconnect with the datasource.
Then, in case of PostGis or Access, use the editin option of the Data Source Explorer
interface to reopen the connection with the database. In case of local files,
change the location path where the layer (vector/raster) is stored and click Open.
HINTS: it is quite common to take a project (*.tview) to another PC. In this case all local layers will appear as disconnected ().
The user must copy all datasets referenced by the project to the other
PC, open the project and adjust the path of each of them.
Some actions at the Layer and at the Map Display depends
on the layer status. Keep this in mind from now on and see how to
select one or more layers at the Layer Explorer.
Layer
Explorer - Selecting
one or more layers
Clicking over a layer
name makes it selected and the
actions available
from the context menu can be executed.
Right-clicking over a
layer name makes it selected and shows
a context
menu of actions that can be executed over a layer. Those actions are
also accessible through the Layer Menu.
Shift+clicking allows
to select a consecutive set of
layers by clicking over the first and the last layer names in
the
tree. A highlighted area appear in the tree and right-clicking
over
this area shows a
context
menu of actions that can
be executed over more than one
layer, for example Remove
Layer(s).
Ctrl+clicking
allows to select a non-consecutive set of layers by clicking over
layer names in the
tree.
All layer names will became highlighted and right-clicking over
one of
them shows a context
menu of actions that
can be executed over all selected layer.
Note that the
box-checked status is not necessary for some actions.
For example, to execute Remove Layer, Show
Table or Classification it is enough to select a layer.