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.