Raster Edition
This interface presents
the procedures for 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 and association of thematic classes, themes or LUT values to
generated polygons, according to the type of image being edited. Before
confirming the association to the thematic class, them or LUT 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, themes or LUT values. This IL can be a classified
image, labeled, synthetic or thematic (raster), or vector from a
thematic or cadastral IL.
In case Image representation, the polygons made by the pixels (themes),
or vectors (labeled image), or pixels from a synthetic image or classes
of a thematic map, are used as limits for the region to be fulfilled by
the new class, theme or LUT.
In case of vector representation, the polygons will be used as limits of
the new class, theme or LUT and the user will always have an IL of
reverence if he wants to go back to the previous class;
-
Classify Area - allows painting an image with thematic classes, themes or LUT
synthetic values on the areas (polygons) that are formed by the image
pixels themselves.
IMPORTANT: The classes will only be changed
after you press the button "Apply". It is NOT possible to undo these operations.
See also:
Digitalization of Maps
Performing
raster edition using "Edit Area" (polygons):
-
activate an Information Layer from a
thematic model with a Raster
representation or an IL from an image model with a synthetic or classified representation;
-
draw it on the active screen;
-
click on Thematic/Image - Raster Editing... on the main menu;
-
on the window
"Raster Edition" select in Type
the option Edit Area;
-
on
Mode
choose between Continuous or Step;
-
if you chose the
Continuous
mode, define a Digit.
Step (mm);
-
click on Operation and
choose Create Polygon. This option is similar to the edition of closed lines;
-
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 LUT values;
-
after you draw the polygon,
click on the mouse RB to close
it. Other polygons can be edited for the same class or you can choose
another one. The created polygon is added to the list of tasks to be
applied. The list presents the tasks order, classes/themes/LUT to be
associated and IL being edited. The screen presents a cross on the
polygon centroid and task number.
-
if you wish,
use other
options in Operation: Add Point, Move Point or Remove
Point before you really
choose the class;
-
select an item from list and click on Remove to remove any edited polygon;
-
click on Apply to
fulfill the polygon with the chosen class (check the sequence of figures
below).
NOTE: Use the button Visual... to
change the color of the thematic class or theme or pixel.

Original Image
|

Image with edited line
|

Image with fulfilled line
|
Performing Raster Edition using "Copy
Area" (labeled, classified, synthetic or thematic) or vectors (thematic
or cadastral):
-
activate an Information Layer from a
thematic model with a Raster
representation or an IL from an image model with a synthetic or classified representation;
-
draw it on the active screen;
-
click on Thematic/Image - Raster Editing... on the main menu;
-
on the window
"Raster Edition" select in Type
the option Copy Area;
-
click on Select Infolayer... 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. In case the
IL has two representations (raster and vector), you will have to inform
from which ones you will copy;
-
after clicking on
Apply, the chosen IL is drawn on the Display 5;
-
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 LUT values;
-
select the kind of copy you want:
Region, to copy each region/polygon individually or Theme/Class/Object,
to copy all regions/polygons from a theme/class/object selected;
-
click on any polygon of the image
on Display 5
and observe that the task number is added to the task list list
with task order, classes/themes/LUT to be associated and IL being
edited. If the option chosen is theme/class/object , the list
will contain the word ALL and all regions will be copied to the active
IL. If the representation is raster, the list will contain the polygon
number, its class/object, the class/theme/LUT that will be associated
and origin IL. If the option is class/object, all polygons with
class/object selected are added to the task list. A black cross is
presented on the screen together with the task number.
-
if you wish to cancel a
copy of any selected region, select an item from the task list
and click on Remove;
-
click on Apply
to
fulfill the polygon with the chosen class (check the sequence of figures
below).
ATENTION - it is not possible to undo this operation after you
click on Apply!
NOTE: Use the button
Visual...
to change the color of the thematic class or theme or pixel.

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 or an IL from an image model with a synthetic or classified representation;
-
draw it on the active screen;
-
click on Thematic/Image
- Raster Editing... on the main menu;
-
on the window "Raster Edition" select in
Type the option Classify Area;
-
select the option Region,
to classify each region/polygon individually or Theme/Class/Object,
to classify all regions/polygons from a theme/class/object selected;
-
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 LUT values;
-
click on the polygon of the image
itself. The following items are included on the tasks list: task order,
current and new pixel values and active IL in case the Region was
selected. The word ALL
is added in case you want to change all regions of the selected
class/theme/LUT A black cross is presented on the screen together with
the task number.
-
if you wish to cancel a
copy of any selected region, select an item from the task list
and click on Remove;
-
click on Apply
to
fulfill the polygon with the chosen class (check the sequence of figures
below).
ATENTION - it is not possible to undo this operation after you click
on Apply!
NOTE: Use the button
Visual...
to change the color of the thematic class or theme or pixel.
Cleaning
Pixels
It allows the elimination of regions delimited by only n pixels. These regions
become part of a neighbor region.
-
activate an Information Layer from a
thematic model with a Raster
representation or an IL from an image model with a synthetic or classified representation;
-
draw it on the active screen;
-
click on Thematic/Image
- Raster Editing... on the main menu;
-
fill in the number of pixels to be
eliminated;
-
click on Clean Pixel(s);
Displacement
("Deslocar") of an Image
It allows to move (shift) the image.
-
activate an Information Layer from a
thematic model with a Raster
representation or an IL from an image model with a synthetic or classified representation;
-
draw it on the active screen;
-
click on Thematic/Image
- Raster Editing... on the main menu;
-
fill in the values in meters of the
shifting (displacement) in X and Y;
-
click on
Apply;
NOTES: On the Themes/LUT list, the RGB composition of their visual is
presented. On the synthetic and classified image, the index 0 or background,
RGB (0, 0, 0), black, becomes transparent, when you draw an image on the
screen.
|