Eye4Software Hydromagic

  Hydrographic Survey Software

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Cross sections

In Hydromagic, cross sections are used to create a theoretical 3D design of the area you want to use to perform volume calculations.
The sections are in fact lines from shore to shore containing depth or elevation information relative to the distance from the shores or riverbanks.

The lines can also be selected during the hydrographic survey to show the direction to steer in the built-in Helmsman display.

By using a boundary, it is possible to auto generate cross sections from bank to bank (automatic placement).
It is also possible to place them by dragging the sections at the correct place by using the mouse (manual placement).

Automatic placement

Using automatic placement, cross sections will be generated to fill a specified boundary.
The direction of, and the distance between the sections can be selected.

To use automatic placement, select the "Generate Sections" option, by right clicking the "Sections" folder in the "Project Explorer". The following dialog will appear:

Automatic cross section placement

For the "Line Direction" you will normally specify the heading perpendicular to the shore or riverbank.
You can measure the direction of the shore using the built in "Distance and Bearing" tool.

The "Line Distance" depends on the size of the area, in this example we leave it to the default value, 10.0 meters.

Use the section name prefix when you have multiple sets of sections. The software will start the names of the generated sections with this prefix,
so it is more easy to determine to which set a section belongs. In this example, we will use "DK" as prefix for the section names.

Finally, select the area you want to use as clipping area for the sections. To start generating cross sections,
fill in the required fields and click "OK". The cross sections are now calculated and displayed on the map:

Edit Section

Manual placement

In some cases, the automatic placement will not suffice, for instance for irregular areas or at places the river makes a turn.
You can then make use of manual placement (eventually in combination with automatic placement).

To create a new section, right click the position of the new cross section, and the following dialog will appear:

Cross Sections

Enter a name for the newly created section and click "OK" (we will discuss the other options of this dialog in the next chapter).
A new section will be created with a default length and azimuth. You can use the mouse to rotate, resize and move the section in the right place.

Moving, resizing and rotating cross sections

After automatic or manual placement, you will notice that a single cross section is drawn as a dashed purple line with 3 anchor points.
You can select these points with the mouse to move or rotate the cross section using the map.

By dragging the center point of the cross section, you can drag and drop it to the new position.
In order to rotate or resize it, use either one of the start and end points of the cross section.

Please note, that in order to drag and drop any objects on the map,
you have to disable the "Disable drag and drop" option from the "Cursor" menu.

Cross Section

Delete cross sections

There are two ways to delete a single cross section:

  1. Right-click the center anchor point of the cross section in the map, and select "Remove Section" from the popup menu;
  2. Right-click the cross section name in the "Project Explorer" and select "Remove Section.

To delete all cross sections, right click the "Sections" folder in the "Project Explorer" and select "Remove All...". After confirmation, all cross sections will be removed from the project.