Raster Edition
The toolbar
presents the procedures for the raster edition over thematic, synthetic and
classified images.
This feature
should be used when you want to improve the image aspect or when you need to
make corrections or updates.
There are three raster edition options
available:
§
Edit Area - allows the digitalization of closed lines (islands) and association of thematic classes to
generated polygons. Before confirming the association to the thematic class
(polygon fulfillment) you can perform a line edition, adding, moving or
deleting points;
§
Copy Area - uses an information layer as a reference for
changing the thematic classes. This IL can be a classified image, labeled,
synthetic or thematic (raster), where the polygons made by the pixels (themes)
of a classified image, or vectors of a labeled image, or pixels from a
synthetic image or pixels of a thematic map classes, are used as limits for the
region to be fulfilled by the new class. The advantage of this option is that
the user will always have an IL of reference if he wants to go back to the
previous class;
§
Classify Area - allows painting the thematic image with
thematic classes on the areas (polygons) that are formed by the image pixels
themselves.
IMPORTANT: In any of the three options, the
system will only change the classes of the pixels that are visible on the
screen.
See also:
The figure
below presents the tool bar of the Raster
Edition.
Caption:
1) Type
Button, allows the selection of the
operation (Edit Area, Copy Area, Classify Area, Clean Pixel e Displace Image) to be performed;
2) Holds
information of the selected operation
on the Type Button;
3) Informs
the Classes/Themes/Lut list;
4) Visual Button;
5) Informs
the operations (tasks) to
be performed;
6) Removes the current operation;
7) Removes all the operations;
8) Execute all the operations;
9) Exits Raster Edition;
10) Help Raster Edition.
Performing
raster edition using Edit Area (polygons):
·
activate an
Information Layer of a thematic model with a Raster representation and draw it on the active screen;
·
click on Thematic/Image - Raster Edition... on the main menu, on in the Control
Panel, or click with the mouse right
button on the chosen IL. When a dialog box is shown, select Raster
Edition.
·
on
the Toolbar "Raster Edition" click on the Type
Button and on Edit Area;
·
choose
from the list Classes/Themes/LUT which one you want to use. Observe
that for a thematic image, only the classes of the data model active IL will be
shown and the class None represents the system background. If the
image is classified, its themes will be presented and if it is synthetic, the
colors that compound its LUT;
·
click on the Edit
Area Button and on Mode choose
between Continuous or Step;
·
if
you chose the Continuous mode,
define a Digit. Step (mm);
·
click on the Edit
Area Button, click
on Operation and choose Create
Polygon. This option is similar to the edition of islands (closed lines);
·
click on the
mouse right button to close the polygon. Other polygons may be edited for the
same class chosen before;
·
use the
other options on Operation,
if you wish to Add Point, Move Point or Remove Point, before applying the
class fulfillment;
·
click on Remove Task to cancel the
selected task;
·
click on Remove All Tasks to cancel all
the tasks;
·
click on Apply
to fulfill the polygon(s) with the chosen class (see the sequence on the
figures below).
ATTENTION – it is not possible to undo the
operation after clicking on Apply!
NOTE: Use the Visual... Button
to change the color of the thematic class, the color of the theme, or the color
of the pixel that is selected on the list.
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Performing
Raster Edition using "Copy Area" (labeled,
classified, synthetic or thematic):
·
activate an
Information Layer of a thematic model with a Raster representation and draw it on the active screen;
·
click on Thematic/Image - Raster Edition... on the main menu,
on in the Control Panel,
or click with the mouse right button on the chosen IL. When a dialog box is
shown, select Raster Edition.
·
on
the Toolbar "Raster Edition" click on the Type
Button and on Copy Area;
·
choose
from the list Classes/Themes/LUT which one you want to use. Observe
that for a thematic image, only the classes of the data model active IL will be
shown and the class None represents the system background. If the
image is classified, its themes will be presented and if it is synthetic, the
colors that compound its LUT;
·
click on the
IL... Button
and choose at the window "Categories and Infolayers" the IL to
be used as reference which can be images (classified, labeled, synthetic or
thematic), or even a thematic or cadastral IL, whose vector representation
contains polygons;
·
after
clicking on Apply at the window above, the chosen IL is drawn on the Auxiliary
Display of the system;
·
click on any
polygon of the image on Auxiliary Screen and observe that the same area of
this polygon is transferred to the active IL with the class, theme or lut
selected above. If you wish, you can change the classes, themes or luts to
select other polygons (see the sequence on the figures below).
ATTENTION - it is not possible to undo the
operation after selecting the polygon!
NOTE: Use the Visual...
Button to change the color of the thematic class, the color of the theme, or
the color of the pixel that is selected on the list.
Original Thematic Image |
Labeled Image indicating selected
areas |
Thematic image with reclassified
areas using the boundaries of the labeled image |
Performing
Raster Edition using "Classify Area":
·
activate an
Information Layer from a thematic model with a Raster representation and draw it on the active
screen;
·
click on Thematic/Image - Raster Edition... on the main menu,
on in the Control
Panel, or click with the mouse right
button on the chosen IL. When a dialog box is shown, select Raster
Edition.
·
on
the Toolbar "Raster Edition" click on the Type
Button and on Classify Area;
·
choose
from the list Classes/Themes/LUT which one you want to use. Observe
that for a thematic image, only the classes of the data model active IL will be
shown and the class None represents the system background. If the
image is classified, its themes will be presented and if it is synthetic, the
colors that compound its LUT;
·
click on the
polygon of the image itself;
·
answer YES
to the question. The color of the selected class/theme/lut replaces the current
class/theme/lut of the polygon (see the sequence on the figures below).
ATTENÇÃO – It is not possible to undo the
operation after answering YES to the question!
NOTE: Use the Visual...
Button to change the color of the thematic class, the color of the theme, or
the color of the pixel that is selected on the list.
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Cleaning Pixels
It allows the elimination of regions
delimited by only one pixel. These regions become part of a neighbor region.
NOTE 1: On the Themes/LUT list, the RGB
composition of their visual is presented.
NOTE 2: On the synthetic and classified
image, the index 0 or background, with RGB (0, 0, 0), black, becomes
transparent, when you draw an image on the SPRING screen.