Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
In GeoHECHMS, the Automated Draw Cross Sections command causes the software to automatically cut cross sections along a reach polyline. The software will attempt to uniformly space cross sections along the routing reach, creating cross sections that are perpendicular to the reach. In places where adjoining cross sections might cross each other, the software will intelligently bisect the cross section point of intersection and then run the adjoining cross sections parallel to each other.
Follow the steps below to use the Automated Draw Cross Sections command:
The following sections describe the Automated Draw Cross Sections command and how to interact with the above dialog box.
This section is used to select the reach alignment polyline(s) that will be used to automatically draw cross sections.
Click the [Pick] button, and the dialog box will temporarily disappear. A prompt will be displayed on the status bar instructing the user to select the reach alignment polyline(s). The user can then select the reach alignment polyline(s) from the Map View.
Once finished, press the [Enter] key or right-click and select Done from the displayed context menu. The Automated Draw Cross Sections dialog box will be redisplayed, and the total number of selected reach alignment polylines will be shown in the Reach polyline read-only entry.
Note that if a reach alignment polyline(s) has been preselected before running this command, the same number of selected polylines will be displayed in the Reach polyline read-only entry.
This tabbed panel is used to define the general settings for the cross sections to be created.
This section is used to control the numbering of the cross section river stations. The cross section river stations need to be unique per river reach, and need to increase in value as they move up the river reach. Cross sections can be numbered using a fixed increment or by the river chainage along the river reach. The river chainage can be in miles or feet if working in US units, or kilometers or meters if working in metric (SI) units.
The following options are provided:
This subpanel is used to number the cross section by using the river chainage along the river reach. Select the Use Reach Distance radio button to enable this subpanel.
The following options are provided:
This subpanel is used to number the cross sections using a fixed increment. Select the Use Auto Increment radio button to enable this subpanel.
The following options are provided:
This section is used to define the placement of cross sections along the selected reach polyline(s).
The following options are provided:
This tabbed panel is used to define the data extraction specifications based on the options selected for the cross sections.
This optional section is used to define the elevation data source(s) to be used for extracting the cross section geometry. Depending upon the elevation data source type that is selected, different options are provided to specify additional elevation data information.
Refer to this article in our knowledge base for information on the types of terrain elevation data that can be used for constructing cross sections.
If the Extract Elevation Data checkbox is unchecked, then the subsequent sections below it will be unavailable (i.e., grayed out). In addition, no geometry will be created when the cross sections are created. The cross sections will be just flat horizontal lines at elevation 0.
The user can also apply the elevation offset by enabling the Apply elevation offset checkbox entry. On selecting this checkbox, the entry field next to it becomes available for entering an elevation offset value. For example, the user can define a negative offset value to lower the junction for specific circumstances, such as in the case of a manhole bottom elevation.
This checkbox optional section is used to provide additional control in terms of the cross section geometry data to be extracted from the terrain model for the automatically drawn cross section polylines. These controls provide additional intelligence on whether to extend or limit the cross section cutting, based upon whether specific criteria have been met. This assures that an adequately deep enough cross section is created on both sides of the river reach. The software will attempt to retrieve the cross section geometry data to the depth specified within the specified maximum cross section width.
If the drawn polyline does not extend outward far enough to get the cross section depth specified, the software will automatically extend the constructed cross section further outward. Similarly, if the drawn polyline extends too far outward for the depth specified, the software will automatically trim the constructed cross section.
This panel is primarily used to perform automated cross section creation along sinuous (meandering) river reaches and is not used for other conditions. By default, the content of this panel is disabled (i.e., grayed out). Select the Generalize Cross Section Alignment checkbox option to enable this panel.
To learn more about this panel, refer to this article in our knowledge base.
This panel allows the user to adjust the Manning’s roughness values for the left overbank, channel, and right overbank areas during the construction of cross sections.
To learn more about this panel, refer to this article in our knowledge base.
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