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June 2004 DelphMap™ User's Manual

Chapter 5 Working with Three-Dimensional

Contacts

You can get an approximate three-dimensional model of selective parts of your

DelphMap imagery by double-left-clicking on any part of a side-scan or

bathymetry layer. The significance of this is that if you have both sidescan sonar

imagery and topography imagery from bathymetry layer present in your project,

the sidescan sonar imagery can be “draped” over the bathymetry layer. (There is

no need for the two layers to be at the same resolution.) When you do,

DelphMap displays your three-dimensional image in a separate window. The

peaks and valleys that form the resulting three-dimensional-like image are based

on amplitude differences from the sonar returns. Thus the peaks and valleys do

not represent true height on the seafloor; instead, they are showing signal

strength differences in the imagery.

Using DelphMap’s three-dimensional Contact window you can:

• inspect the model from different angles by moving it up, down, left,

right, or diagonally.

• suppress or enable apparent resolution while moving your three-

dimensional model

• change the vertical scale or reset the viewpoint position of the three-

dimensional contact model

• display the three-dimensional contact in gridded form, solid form, or as

seen by a “flat” sonar return

• take a snapshot of the three-dimensional window and save the results

into any of four graphic formats

• update the model with a real-time mosaic

• view or suppress the implied light source that gives shape to the three-

dimensional model

• reposition the light source to show different modeling of the three-

dimensional image

• move the directional indicator to any part of the three-dimensional

Contact window

• view or suppress a three-dimensional cursor showing your current

position in the three-dimensional model

Chapter 5: Working with Three-Dimensional Contacts 88

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