10 Setting the drawing range for the ADCP views

The velocity measurement (ADCP) views provide echograms and velocity views for a water column ranging from the vessel to the sea floor (or maximum range of the transducer). The different ADCP beams, which are set at an angle, offer a possibility to present the depth range of the ADCP views in different ways.

Context

Drawing Range defines the depth range used for the velocity measurement (ADCP) views. This is a visual enhancement. The beams from the transducer hit the bottom at different ranges due to their different directions and the varying topography of the sea floor. Each of the ADCP beams are set at a fixed angle to the vertical centre line of the ADCP transducer. If the sea floor contains steep ascents/descents the difference between the first last beam to hit the sea floor can be significant. Water velocity calculations are performed according to the range specified.

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Full: Drawing range is specified by the number of samples available. The drawing range in the ADCP views will be the range of the ADCP transducer. This is limited by view range and recording range set in the user interface.

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First Bottom Hit: Drawing range is defined from the vessel to the depth at which the first of the ADCP beams hits the sea floor.

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Last Bottom Hit: Drawing range is defined from the vessel to the depth at which the last ADCP beam hits the sea floor.

Procedure

Click once in the relevant view.

The view is activated. It is identified with a thick border.

Open the Active menu.

Select ADCP View Settings to open the dialog box.

On the left side of the ADCP View Settings dialog box, select Lines to open the page.

Observe the Drawing Range setting.

Select the setting you want to use.

Apply the change(s) you have made.

Select Apply if you wish to apply the chosen setting only to the currently active echogram view.

Select Apply to All if you wish to use the chosen setting on all the echograms of the same type.

Close the dialog box.