Echogram navigation

You navigate around an echogram using a combination of scroll bars, mouse clicks, menu commands and keyboard shortcuts.

Note: The navigation methods described on this page do not apply to 3D windows, see 3D Navigation for more information.

Panning

On single beam echogram windows displaying scroll bars, you can pan in the following ways:

- OR -

- OR -

Scrolling

You scroll through an echogram using:

Zooming

Zooming allows you to change the magnification level in the echogram window, e.g. to focus in on specific part of an echogram. Zoom-in and zoom-out are limited for performance reasons.

Mouse wheel zoom

For single beam and multibeam echograms and cruise tracks you can use the mouse wheel to zoom in and zoom out. To zoom out further than [1 ping:1 pixel] or [1 target: 1 pixel] use CRTL+ zoom out with the mouse wheel.

Zoom toolbar

A Zoom toolbar is available.

Zoom shortcuts

Keyboard zoom shortcuts include:

Option

Description

Zoom in

Zooms in on a selection or increases the magnification by a factor of two.

To zoom in:

  1. Optionally, make a selection around the area you want to zoom in on.
  2. Do one of the following:
  • Press S.
  • On Shortcut (right-click) menu, click Zoom In.
  • On the View menu, click Zoom In.

Zoom out

Undoes the effect of the previous zoom in action: i.e. if you zoomed in on a selection, zoom out will return you to the level of magnification at which the selection was made; if you zoomed in without making a selection, zoom out will reduce the magnification level by a factor of two.

To zoom out do one of the following:

  • Press W.
  • On the Shortcut (right-click) menu, click Zoom Out.
  • On the View menu, click Zoom Out.

Note: If you continue to select Zoom Out you will return to Echoview's least magnified view.
 

Unzoom

Zooms out to the lowest level of magnification.

To unzoom do one of the following:

  • Press U.
  • On the Shortcut (right-click) menu, click Unzoom.
  • On the View menu, click Unzoom.

Synchronizing echograms

If more than one echogram window is open in an EV file then all echograms can be synchronized to show the same area of data.

To synchronize echograms, do one of the following:

Auto-synchronization

An echogram, cruise track, 4D window, Media window or a ping graph can be added to the auto-synchronized group using a toolbar button, auto synchronization tool or a shortcut key (SHIFT+A). You can see if a window is in the auto-synchronized group by the status of this toolbar button when the window is active. The button appears depressed if the window is in the auto-synchronized group and raised if not.

When a window is added to the auto-synchronized group it is immediately synchronized to the windows already in the group, if there are any.

For this purpose each window has a time determined as follows:

single beam echogram:

the time of the ping nearest the center of the echogram window.

multibeam echogram:

the time of the ping currently visible (seen in the status bar).

cruise track:

the time is marked with a cross hair (cruise tracks are slaves in the auto-synchronized group, the cross hairs move in response to echogram navigation).

Media window:

the time of the frame associated with the Media slider position. The Playback time is displayed to the side of the slider control.

the time of the image associated with the Media slider position. The Playback time is displayed to the side of the slider control. See also image Media Display Properties.

ping graph:

the time of the ping locator on a single beam echogram.

On single beam echograms a ping indicator, that can be dragged by the mouse pointer, identifies the current ping. Any echogram in the auto-synchronized group can be used to control:

Notes:

See also

Navigating Echoview
Graph navigation
Echogram tools toolbar
About keyboard shortcuts
Using image data
Using video data