Cutting out an IL through the selection of a mask:

  • activate in the Control Panel the category and/or IL that you wish to cut out;
  • click on Tools - Cut Out Infolayer... in the main menu. The associated window is presented;
  • select the option Select Mask;
  • click on the Layer... button;
  • In the Categories and Infolayer window select the category and the IL that contain the polygon with the limit that you wish to use and click on Apply;
  • when selecting an IL display number 5 is opened for you to select the polygon that will be used as the mask for the cut out;
  • decide if the cut out will be executed over the active IL or every IL's of the active category. In both cases add a suffix to the name of the active IL or to the Category (empty field in front of the name of the category), so that new IL's can be created, otherwise the original IL's will be permanently modified;
  • click on Apply to execute the cut out.

NOTE 1: The option Internal Cut Out generates an IL with the data contained in the mask, while the option External Cut Out generates an IL with the data that is not contained in the mask.

NOTE
2: The limit polygon in the IL must be adjusted and polygonized. It is not necessary that it be associated to a class (if thematic) or to some object (if cadastral).


Cutting out an IL through the edition  of a mask:

  • activate in the Control Panel the category and/or IL that you wish to cut out;
  • click on Tools - Cut Out Infolayer... in the main menu. The associated window will be presented;
  • select the option Edit and you will be able to digitize the limits;
  • edit a closed line, similar to the resource available for vector editing. By default the mode of edition is PASSO. By clicking the right button of the mouse the first and last points close automatically.In this version of SPRING only one limit can be edited for input.
  • decide if the cut out will be executed over the active IL or every IL's of the active category. In both cases add a suffix to the name of the active IL or to the Category (empty field in front of the name of the category), so that new IL's can be created, otherwise the original IL's will be permanently modified;
  • click on Apply to execute the cut out.

NOTE: The edited limit is not saved in any IL, neither in memory, after executing the cut out. So, if yo wish to apply the same cut out to other IL's, use one of the other options: Select Mask and Bounding Box.


Cutting out an IL through a Bounding Box:

  • activate in the Control Panel the category and/or IL that you wish to cut out;
  • click on Tools - Cut Out Infolayer... in the main menu. The associated window will be presented;
  • select the option Bounding Box. Note that the button Bounding Box below is now active;
  • click on the Bounding Box... button and in the associated window type in the values of the coordinates, plane or geographic, or yet with the option Cursor Yes selected, you may use the area cursor to define the bounding box. Click on Apply. Learn more about the use of the Bounding Box window;
  • decide if the cut out will be executed over the active IL or every IL's of the active category. In both cases add a suffix to the name of the active IL or to the Category (empty field in front of the name of the category), so that new IL's can be created, otherwise the original IL's will be permanently modified;
  • click on Apply to execute the cut out.

OBS: In this version of SPRING the cut out cannot be performed over the TIN representation.


Cut Out Infolayers: Concepts

This tool provides the delimitation or masking of any infolayer (IL) of a project. To perform the cut out the user must define the limits to be cut out. Such limits can be defined in one of three ways:

  • Select Mask: from an IL that contains some polygon;
  • Edit: can be digitized on the screen as a closed line (island);
  • Bounding Box: a bounding box can be defined by exact coordinates or by the area cursor.

The cut out can be performed over:

  • Active IL - can be applied over the active IL, definitely modifying it, or creating a new IL of the same category;
  • Active Category- the cut out will be performed over every IL of the present category. If a suffix is informed for the names of the IL's other IL's will be created with this suffix, keeping the originals; on the contrary, every IL will be definitely modified.

The cut out can also be performed over any IL of any category, both raster and vector. For an irregular contour, a county limit for example, a raster IL will be filled in with black pixels up to its limits (see the figure below), if it is a monochromatic image, otherwise they will be white.

BEFORE    AFTER

NOTE: In case you apply a cut out over the image IL itself the dimensions of the bounding box will be kept the same, filling in with black or white pixels up to the limits of the box. However, when the cut out is applied by creating a new IL this will have a bounding box with dimensions equal to the cut out limits themselves.

In case the IL to be cut out is vector, with polygon topology for example, the line limits will be part of the resulting cut out IL, keeping the identification of the polygons, be it cadastral or thematic. The figure below presents a cut out thematic IL.

BEFORE AFTER