The :guilabel:`Working toolbar` allows for creating :guilabel:`temporary ROIs` and :guilabel:`classification previews`. It is loaded only if the :guilabel:`Simplified interface` is not enabled.
The functions are described in detail in the following paragraphs.
| Tool symbol and name | Description |
|---|---|
 |
show the :ref:`main_interface_window` |
 |
zoom the map to the extent of the :guilabel:`active band set` in :ref:`band_set_tab`; |
 :guilabel:`RGB=`   |
use the button to show/hide the :guilabel:`active band set`
in :ref:`band_set_tab` in the map; from the list select
a :ref:`color_composite_definition` that is applied to
the :ref:`band_set_tab`; new color composites can be entered typing the
band numbers separated by - or ; or , (e.g. RGB = 4-3-2 or
RGB = 4;3;2 or RGB = 4,3,2) |
 |
display the input image stretching the minimum and maximum values according to cumulative count of current map extent |
 |
display the input image stretching the minimum and maximum values according to standard deviation of current map extent |
A :guilabel:`temporary ROI` is a temporary polygon displayed in the map, which can be saved permanently in the :ref:`training_input`. A :guilabel:`temporary ROI` can be drawn manually or using a :ref:`region_growing_algorithm` (i.e. the image is segmented around a pixel seed including spectrally homogeneous pixels).
| Tool symbol and name | Description |
|---|---|
 |
zoom the map to the extent of :guilabel:`temporary ROI` |
| :guilabel:`ROI` |
use the button to show/hide the :guilabel:`temporary ROI` and the :guilabel:`Training input` in the map |
 |
activate the pointer to create a :guilabel:`temporary ROI` by drawing a
polygon in the map; left click on the map to define the ROI vertices
and right click to define the last vertex closing the polygon; press
the keyboard button CTRL to add a multipart polygon; press the
keyboard buttons CTRL + Z for removing the last multipart polygon |
 |
activate the pointer to create a :guilabel:`temporary ROI` using the
region growing algorithm; left click on the map for creating the ROI;
right click on the map for displaying the spectral signature of a pixel
of the :guilabel:`active band set` in the :ref:`spectral_signature_plot`;
press the keyboard button CTRL and left click to add a multipart
polygon (new parts are not created if overlapping to other parts);
press the keyboard buttons CTRL + Z for removing the last multipart
polygon; press the keyboard button CTRL and right click to plot
spectral signatures of the same pixel for all the :guilabel:`band sets` |
 |
create a :guilabel:`temporary ROI` using the region growing algorithm at the same seed pixel as the previous one; it is useful after changing the :guilabel:`region growing parameters` |
:guilabel:`Region growing parameters`: the following parameters are required for the ROI creation using a region growing algorithm on the :ref:`band_set_tab`:
| Tool symbol and name | Description |
|---|---|
:guilabel:`Dist`  |
set the interval which defines the maximum spectral distance between the seed pixel and the surrounding pixels (in radiometry unit) |
| :guilabel:`Min` |
set the minimum area of a ROI (in pixel unit); this setting overrides
the Range radius until the minimum ROI size is reached; if
Rapid ROI on band is checked, then ROI will have at least the size
defined Min ROI size; if Rapid ROI on band is unchecked, then
ROI could have a size smaller than Min ROI size |
| :guilabel:`Max` |
set the maximum width of a ROI (i.e. the side length of a square, centred at the seed pixel, which inscribes the ROI) in pixel unit |
:guilabel:`Classification preview` allows for displaying temporary classifications (i.e. classification previews). Classification previews are useful for testing the algorithm in a small area of the :ref:`band_set_tab`, before classifying the entire image which can be time consuming.
:guilabel:`Classification preview` is performed according to the parameters defined in :ref:`classification_alg`.
Warning
ROIs and previews are performed on the active :ref:`band_set_tab`.
After the creation of a new preview, old previews are placed in QGIS Layers
inside a layer group named Class_temp_group and are deleted when the
QGIS session is closed.
Warning
Classification previews are automatically deleted from disk when the QGIS session is closed; a QGIS message (that can be ignored) could ask for the path of missing layers when opening a previously saved project.
| Tool symbol and name | Description |
|---|---|
 |
zoom the map to the extent of the last :ref:`classification_preview` |
| :guilabel:`Preview` |
use the button to show/hide the last :ref:`classification_preview` in the map |
 |
activate the pointer for the creation of a :ref:`classification_preview`; left click the map to start the classification process and display the classification preview |
 |
create a new :ref:`classification_preview` centred at the same pixel as the previous one |
| :guilabel:`T` |
change dynamically the classification preview transparency, which is useful for comparing the classification to other layers |
| :guilabel:`S` |
size of the preview in pixel unit (i.e. the side length of a square, centred at the clicked pixel) |
 |
create a KML file of the QGIS view |