Analysis Tab (Surface Properties Dialog Box)

Use this tab to modify the properties of a selected surface analysis type.

Note: The Analysis tab displays varying fields and options depending on the type of analysis that you select.

Analysis Type

Specifies the current analysis type properties that you can modify.

Note: You set the default values for the analysis on the Analysis tab of the Surface Style dialog box.

• Contours: Specifies the contours analysis properties.
• Directions: Specifies the directions analysis properties.
• Elevations: Specifies the elevations analysis properties.
• Slopes: Specifies the slopes analysis properties.
• Slope Arrows: Specifies the slope arrows analysis properties.
• User-Defined Contours: Specifies the user-defined contours analysis properties.
• Watersheds: Specifies the watersheds analysis properties.

Preview

Displays a preview of the legend table for the current analysis type. Clear the check box to disable the preview option.

Legend

Specifies the legend style for the current analysis type.

Note: You set the default style on the Analysis tab of the Surface Styles dialog box.

Ranges

Specifies the number of ranges to use for contours, directions, elevations, slopes, slope arrows, and user-defined contour analysis.

Number

Specifies the numbers of ranges in the analysis. Enter a number or click the up/down arrows to increment the value.

Note: The default number of ranges is set in the Analysis tab of the Surface Styles dialog box.

Generates the analysis and updates the Range Details group box with the analysis information.

Watershed Parameters

Displayed if Analysis Type is set to Watersheds. Specifies the minimum depression depth and area for watershed analysis.

Minimum Average Depth Threshold

Specifies the minimum average depth at which a depression in the surface may be considered a watershed. This prevents minor depression depths from being defined as watersheds.

Merge Adjacent Boundary Watersheds

Specifies that adjacent boundary segment and or boundary point watersheds (along the edges of the outer surface border) should be merged.

Generates the analysis and updates the Details group box with the analysis information.

Range Details

Note: The Range Details area of the Analysis tab displays varying fields and columns depending on the type of analysis that you have selected.

Scale Scheme To Fit

Specifies whether the number of entries is scaled or read sequentially:

• Selected: The number of entries in the scheme is scaled to uniformly cover the number of ranges, that is, an even sampling is taken from the scheme between the first and last entries.
• Cleared: The scheme is read sequentially starting at the first entry.

Note: If there are fewer entries in the scheme than the number of values in the list of ranges, Autodesk Civil 3D functions as if the check box is cleared. This means that the scheme is read sequentially until all the entries in the scheme have been used. In all cases, the last entry in the scheme is used when there are more ranges than scheme entries.

Range Details

Specifies various details in table form depending on the type of analysis that is performed. Details are displayed in the following columns:

ID

Displays an index number for each range.

Description

Specifies a description for user-defined contours and watersheds.

Elevation

Displays the elevation value of the user-defined contour.

Minimum Elevation/Direction/Slope

Displays the minimum range value for the analysis view.

Maximum Elevation/Direction/Slope

Displays the maximum range value for the analysis view.

Scheme

Specifies a color preview assigned by the Scheme property on the Analysis tab of the Surface Style dialog box. Double-click the column to select a different color.

Major Contour

Specifies how the ranges major contours are displayed:

• Click to select a display color for the major contour display.
• Click to select a display lineweight for the major contour display.
• Click to select a display linetype for the major contours.

Note: You set the default display for the surface style on the Analysis tab of the Surface Style dialog box.

Minor Contour

Specifies how the ranges minor contours are displayed:

• Click to select a display color for the minor contour display.
• Click to select a display lineweight for the minor contour display.
• Click to select a display linetype for the minor contours.

Note: You set the default display for the surface style on the Analysis tab of the Surface Style dialog box.

Type

Displays the watershed type and specifies if the individual watershed is displayed or hidden in the drawing. Click the light bulb icon to display or hide .

Note: To change the display for the watersheds by type rather than individually, click above the Details table.

Drains Into

Displays a comma-delimited string containing the subarea watershed IDs that the subarea watershed drains into. For example, the string "4,5,6" indicates that the subarea drains into subareas 4, 5, and 6.

Segment Display

Specifies how the segments of the watershed subarea are displayed:

• Click to select a display color for the segment.
• Click to select a display lineweight for the segment.
• Click to select a display linetype for the segment.

Note: You set the default display for the surface style on the Analysis tab of the Surface Style dialog box.

Area Display

Specifies and previews the hatch pattern for the watershed subarea.

• Click the hatch pattern preview to change the pattern using the Hatch Properties dialog box.
• Click to select a display color for the hatching.

Note: You set the default display for the surface style on the Analysis tab of the Surface Style dialog box.

Click to open the Watershed Display dialog box where you can hide or display watersheds by type.