wxGUI Interactive Scatter Plot Tool

KEYWORDS

       display, GUI, imagery, scatter plot

DESCRIPTION

       Interactive  Scatter  Plot  Tool  allows  analyzing  group  of  raster  maps. The tool is integrated into
       Supervised Classification Tool (see the screen shot below).  Also it is possible to launch  it  from  Map
       Display  Window  (Analyze  map  →  Interactive  Scatter  Plot  Tool).   The main idea of the tool is that
       everything is linked together (scatter plots together and mapwindow with the scatter  plots).   The  main
       feature of the tool is the interactivity, which allows user to:

           •   work with multiple plots, which represents multiple raster bands combinations,

           •   highlight  plotted  points in open scatter plots according to currently chosen pixels for classes
               by it’s training areas (supported only in Supervised Classification Tool),

           •   be able to define areas in plots and the tool will highlight pixels in  map  display  window  and
               corresponding points in other plots,

           •   plot of confidence ellipses.

TOOL CONTROLS LAYOUT

       If  editing  mode  is activated (the green polygon tool in toolbar), the areas which were selected in the
       scatter plots are highlighted. In the image you can see this area for scatter  plot  of  bands  B_6,  B_7
       inside  the ellipse.  Opacity and color of the selected area can be set in settings. The area corresponds
       to the active class (in this case clouds).  Selected areas are subset of  areas,  which  belongs  to  the
       category.

       In the editing mode it is possible to select certain area by the polygon, which can be created and edited
       by tools in editing toolbar.  After the area is selected, we  can  include  or  exclude  it  into  active
       category  by  clicking  on  the  first (plus) respectively second (minus) tool in the editing toolbar. In
       mapwindow corresponding pixels are shown by the class  raster  representing  selected  areas  in  scatter
       plots.  In  this  case we can see clouds class raster (blue), forest class raster (green) and water class
       raster (red).

NOTES

       The tool can analyze only integer (CELL) rasters.  It works with 8  bit  range  smoothly.   The  tool  is
       capable  of  processing data up to 12 bit range, however it is not recommended open many scatter plots in
       12/11 bit mode.  It could require significant amount of memory and plot rendering  time  can  be  longer.
       Analyzing  of  raster  data  with higher range is not recommended.  The raster range can be lowered using
       r.rescale.

KNOWN ISSUES

       Selection of areas in mapwindow is currently supported only if the  tool  was  launched  from  Supervised
       Classification Tool.

SEE ALSO

        wxGUI
       wxGUI components, r.rescale

       See also the user wiki page.

AUTHOR

       Stepan Turek, Google Summer of Code 2013 (mentor: Martin Landa)

SOURCE CODE

       Available at: wxGUI Interactive Scatter Plot Tool source code (history)

       Main index | Wxgui index | Topics index | Keywords index | Graphical index | Full index

       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual