Bounding Box

The "Bounding Box" window is used to select an area, smaller or equal to the project, for defining a new Information Layer. Sometimes it is necessary to reduce the IL area for reducing the data size (raster format such images and processing time.

This window can be accessed from several different interfaces of SPRING: "Infolayers", "Mosaic", "Filtering", "TIN Generation", "Grid Generation" and "Slope". We will present next who to define a Bounding Box, using the cursor or not, or simply typing the values. In case you do not use the cursor, you can use the values defined for the active IL or the project itself. When the "Bounding Box" window is open, The default values are of the active Information Layer.

Defining predefined values for Bounding Box:

  • after clicking on Bounding Box... from any of the interfaces mentioned above, the window will be presented;
  • in Cursor: click on No;
  • click on Active PI or Project. Observe that, depending on your choice, the coordinate values will be updated on the bottom of the window. It does not matter if you choose Planes or Geographic coordinates;
  • click on Apply.

NOTE: If you press Close instead of Apply , the Bounding Box of the active IL will be considered.


Defining the Bounding Box using the Cursor:

  • in Cursor: click on Yes. Observe that the button Acquire is enabled. The Zoom Cursor or will be automatically active;
  • mark on the active screen the region you wish (check how to use the Zoom Cursor). Press with the mouse left button (LB) on the left top of the screen, move the cursor and then press again on the bottom right;
  • click on Acquire. Observe that the coordinated values are presented on the window;
  • click on Apply to confirm the selected area.

Defining the Bounding Box by editing the coordinates:

  • in Coordinates choose between: Geographic or Planes;
  • change the values of the two points. Long1/Lat1 or X1/Y1 correspond to the bottom left point and Long2/Lat2 or X2/Y2 correspond to the top right point. Before changing the values (Active IL), you can use one of the procedures above just to obtain predefined values;
  • for planes coordinates, click on Hemisphere N or S;
  • click on Apply.

The syntax for typing Latitude and Longitude (o/w/e/s/n degrees minutes and seconds) is:

    Long1= o 45 30 15 Long2= o 45 15 00
    Lat1 = s 18 35 40 Lat2 = s 17 50 35


The syntax for typing Planes coordinates (in meters) is presented on the example below:

    X1 = 450000   X2 = 466000
    Y2 = 7568000 Y2 = 7586000


NOTE: When the "Bounding Box" window is open again, the values are restored according to the active IL.


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