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
|