Draw Grid; Zoom Button; Filter Selector - Gemini 720id Product Manual

Multibeam imaging sonar

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Gemini Software Operation

5.1.9. Draw Grid

If the Gemini unit has CHIRP enabled, the zoom window will show Acoustic Zoom data.

Acoustic Zoom data is additional data collected by the Gemini unit for the highlighted area,

allowing a more detailed view without loss of resolution. If data is being recorded when this

button is enabled, the Acoustic Zoom data will also be recorded in addition to the normal

view data.

If the Gemini unit does not have CHIRP enabled, the zoom window will show Digital Zoom

data. This data is simply a magnified view of the data present on the normal view.

The zoom window positions itself to either the left hand side or the right hand side of the

screen so that it does not obscure the Gemini data. The magnification level of the window

is changed by using the mouse wheel, or by using the + and – buttons next to the zoom

button. The magnification level can be changed between 1.5x (minimum magnification)and

40x (maximum magnification).

Clicking within the Gemini data arc will lock the zoom at that point. Clicking outside of the arc

will release the lock and the zoomed area will follow the mouse pointer.

The Gemini software allows three filters to be applied to the image after it has been received

from the Gemini Sonar and also to replayed data. From left to right, they are None, Average,

Persistence, and Movement.

There are controls on the advanced screen to change the setting for each of the filters and

they are described in more detail in Section 5.2.4, "Filter Settings".

Document: 0685-SOM-00001, Issue: 12

The Draw Grid button, when clicked, draws the range and bearing grid on the

displayed Gemini data. The illustration above shows the button in the on state.

When the Zoom button is clicked, a zoom window opens which shows the

data around the mouse pointer in more detail, as the following image shows.

Zoom box example with Gemini Sonar data

Gemini Imaging Sonar

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