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Defining a Cross Section Line

Use the Map Manager to define the locations of cross section lines, which can then be interpreted in the Cross Section editor. There are two methods for defining cross section lines: Digitizing and Use Existing Polyline. Additionally, you can modify the buffer area for your cross sections. Each method is described below.  

 

Digitizing a Cross Section Line

 

In the Map Manager, open an existing map project or create a new map project.

 

Select a Hydro GeoAnalyst data layer (i.e. station data), and ensure this is visible and active (selected). If you do not have such a layer, you may create one based on station groups that are available in your Hydro GeoAnalyst project. To do this use the Layer > Load HGA Data option to select a station group. The Map Manager creates a layer with stations that are available in the group.

Zoom-in to the area of interest (optional).

 

Click the (Cross Section Line) button at the right end of the toolbar, or select Tools/Define Cross-Section Line from the Main Menu.

 

Place the mouse cursor at the starting point of the line, and click once with the left mouse button.

Click again at another location to add a vertex to the line. You may add one or more vertices that define the cross-section line. Note: If you wish to place a vertex beyond the extent of the current map view, click and hold the right mouse button to pan across the map. Also, you can use the mouse wheel to zoom in and zoom out, while defining the cross section line.

At the end point of the line, double-click the left mouse button to finish. This will launch the dialog shown below:

 

 

For each cross section line, specify a Name, Buffer Distance and Description. The Buffer Distance determines which stations will be included in the cross section; stations which lie within the buffer distance will all be selected (as indicated by a red circle on top of the station's symbol) and included in the cross section. The Buffer Distance is projected out perpendicular to the cross section line.

Click [OK] to accept the Line attributes.

 

If necessary, selected stations can be deselected by clicking on each of them while holding down the <Ctrl> key.

If necessary, extra stations may be added to the selection by clicking on one or more stations while holding down <Ctrl> key.

 

NOTE: Once a cross-section line has been created, stations can still be added to or removed from the line by selecting the line, then right-clicking and choosing the Add/Remove Stations option. Stations can then be added/removed by clicking on the desired stations. In order to use this feature, the station layers on which the cross section are based (e.g. Boreholes), must be set to Visible in the

Layer Control.

 

The cross section can then be created as follows.

Select Tools > Create Cross Section from the Main Menu, or click on the Cross Section button on the toolbar.

Click [Yes] to create the cross section; the name assigned to the cross section line will be used for the cross section name.

 

Use Existing Polyline

 

You can create a cross section line from an existing polyline layer. To do so, follow the steps below:

Right-click the desired line segment and select Convert to Cross Section Line from the pop-up menu.

 

 

Specify a Name, Buffer Distance and Description. The Buffer Distance determines which stations will be included in the cross section; stations which lie within the buffer distance will all be selected (as indicated by a red circle on top of the station's symbol) and included in the cross section. The Buffer Distance is projected out perpendicular to the cross section line.

 

Click [Ok] to accept the line settings. The Select Station Layer dialog will display.

Select the appropriate station layer from the dropdown list box and click [Ok].

 

 

The following message will display:

 

 

Click [Yes] to open the cross section in the Cross Section editor.

 

 

This will load the cross section editor. For more details on creating cross sections, you may refer to Cross Section Editor section.

 

Modify Buffer Distance

 

To modify the buffer distance of a cross section line:

Select the cross section layer from the Layer Manager panel.

Select a cross section line.

Right-click, and select Update Buffer from the pop-up menu.

 

 

From the CrossSection Line dialog, specify a new buffer distance.

Click [Ok].

 

Map Manager will now regenerate the cross section line using the new buffer distance.

 

Note: Buffer distances for cross sections generated in past versions of HGA cannot be modified.

 

 


 


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