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:

Edition


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.


Original Image


Image with edited line


Image with fulfilled line

 


 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.

  

 

 

 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.