Introduction

Geocap Seafloor can compare data from different datasets by viewing the data in a cross section view. By changing the visualisation attributes it is possible to identify problems in the data. In this exercise the data will be visualised in both 3D and 2D.

The Cross Section Window can be used to check calibration of the multibeam survey lines.

Exercises

Exercise

Compare two overlapping survey lines against each other

Make sure you have displayed two overlapping survey lines in the graphics window, using the same method as in one of the previous exercises. For instance, display the two lines 0000_20060112_130156_Simrad_echo.all and 0001_20060112_131814_Simrad_echo.all.

In the Geocap main window, click Windows > New > Cross Section Window. The cross section window will appear at the bottom of the screen.
In the cross section window click the arrow to right of the icon, and open the menu.
Click the Digitize cross section entry in menu.
Create a profile over the overlapping area, by digitizing two points in the graphics window using your left mouse button.

You should now see the multibeam soundings along the profile in the cross section window. You can zoom using your right mouse button, use the left mouse button to pan and the mouse wheel to scale the z-direction.

Points at a certain distance on both sides of the cross section are projected on to the cross section window. You can decide this distance by editing the Point projection distance.

Exercise

Edit the color and size of points in the cross section window

In the cross section window, right click one the name of one of the survey line and select Edit.
In the dialog that pops up, change the Point color to another color than the default.
You should now be able to distinguish the points on each line from each other.

Try out different display options in the edit dialog.

Exercise

Edit the size, direction and position of the profile

In the graphics window click on the profile frame. You should now see one sphere in each corner of the profile.
Click and drag one of the spheres to re-size or change the angle of the profile.
Click in the middle of the profile and drag in order to move the whole profile.

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