Collection Generation
The user can define an objects collection which is a set of all objects in the
category. Whenever a cadastral IL is active, the Query... button
is enabled on the "
Control Panel" and if you click on it, the "
Generating and Selecting Collections" window will be presented. Even if the user does not
want to define a specific collection, he must go through this interface and
choose ALL to perform the query.
A collection is defined for only one object category,even
if the active IL has more than one. There are two different ways to do it:
Defining
the collection considering the category attributes from the selected object,
for instance, "generate a collection of the object Farms that have areas greater
than 2.500 ha";
Defining
the collection by drawing a rectangle using the Zoom Cursor ( ):
all entities (points, lines or polygons) that are inside this rectangle will be
considered.
NOTE: The system stores the definition of all collections in a table
called "collections", and the objects in tables with the same
name of each collection. See the instructions below:
Creating a collection of an object attribute:
-
activate a cadastral IL which has
data to be queried;
-
click on Query... on
the "
Control Panel".
The
"
Generating and Selecting Collections" window is presented;
-
type a name for the collection
on the field Collectionand
click on Create;
-
on the Attributes
list, choose one and clique on it. Observe that the Logical Expression field presents the result of your choice;
-
click on an Operation ( = ,
< > , > , < , >= , <= );
-
type in a value for the selected
attribute and click CR, or use the Value buttons: T
(All), E (edges) or N (none) to see the list of values and
to then select one;
-
use one of the buttons (
), AND, OR, ( or )
to continue typing the expression;
-
click on Generate
after defining the query expression;
-
click on Apply to
select the collection. The windows "Visualizing Objects" and
"
Table" are
presented.
Creating a collection using the Zoom Cursor:
-
activate a cadastral IL which has
data to be queried;
-
click on Query... on
the "
Control Panel".
The
"
Generating and Selecting Collections" window is presented;
-
type a name for the collection
on the field Collectionand
click on Create;
-
click on View
- Zoom Cursor(
) on the main menu to activate it
and define a rectangle as if you were performing a zoom. Click on a top left point and then on a
bottom right point
to involve the entities you want.
-
click on Area: With
cursor after having defined the rectangle. The X and Y
coordinates will be updated;
-
click on Generate
after defining the query expression;
-
click on Apply to
select the collection. The windows "Visualizing Objects" and
"
Table"
are presented.
Applying an already defined collection:
-
activate a cadastral IL which has
data to be queried;
-
click on Query... on
the "
Control Panel".
The
"
Generating and Selecting Collections" window is presented;
-
select on the Objects
Categories list the want you want. Sometimes the associated IL has a
single category and this one will be available on the list;
-
select on the Collections
list
the one you want. The option ALL will always be available;
-
click on Apply to
activate the collection. The "Visualizing Objects" and
"
Table" windows
will be presented.
OBS: To delete a collection you should repeat the four first steps above
and then click onDelete.
See also:
Database Query
How to control Objects Visualization .
Attributes Query.
Spatial Query
Attributes
Table.
Pointing and Photo Module.
Query
Models.
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