Creating the Mosaic Image
SeaKing Sidecan Sonars
0374-SOM-00013, Issue: 01
57
© Tritech International Ltd.
• An image with GPS data in an associated world file to use as a background. Or
appropriate GPS coordinates and geographical dimensions sufficient to encompass
all of the sonar image tiles if creating the chart manually.
• A set of sonar image tiles from a Seanet Pro session which include GPS data in
accompanying world files.
Given data already created using Seanet Pro the process for tiling images into a
mosaic is as follows:
1. Create a chart: either from an image, import a previously created chart or create
a blank chart from GPS data.
2. Load sonar image tiles onto the chart.
3. Manipulate the image tiles to the correct position (if required).
4. Either export the resulting mosaic as a bitmap (with world data) or save as a project
(containing a chart and a collection of tiles) to work on again later.
16.2. Create the Background Chart
The Sonar Image Tiler starts with a blank screen:
First create a chart background onto which the sonar image tiles will be placed.
If Seanet Pro is running on the PC and has a chart configured as part of its
Nav
application then you can select it using the
Files
menu and
Open Seanet Chart
option. If no Seanet chart is available click on the
Import/Create Chart
button
to set up a new chart background.
Note
It is also possible to use the first tile as the chart background - see below
for the procedure for adding tiles. This tile cannot be moved or rotated
and acts as the fixed reference point for other tiles.
In the
Add Chart
dialog box there are three options for adding or creating a chart.
The user can select to use an image with associated world file; an image with manually
