Option

Description

Available for all gridding methods:

Compute Band

Density

Creates an attribute layer that displays the density of soundings contributing to a node.

Mean

Creates an attribute layer that displays the mean of all soundings contributing to a node.

Standard Deviation

Creates an attribute layer that displays the standard deviation from the mean.

Shoal

Creates an attribute layer that displays the shoalest soundings contributing to a node.

Deep

Creates an attribute layer that displays the deepest soundings.

Keep Up to Date

This option is set to track the outdatedness of a surface. Enabled by default, this option must be set in order to use the Automatic Surface Update function in Tools > Options >Coverage.

Comments

User comments.

Bounding Polygon Type

The new surface can be created with a convex bounding polygon or with a buffered bounding polygon.

Output Vertical Coordinate Reference System

The options available in the list are controlled by the Vertical Coordinate Reference System database. This list can be edited using the Reference System Editor tool. See Vertical Reference System.

1. [Optional] Select an Output Vertical Coordinate Reference System option from the list.

Swath Weighting only

Max Footprint Size

Defines the maximum area in the Surface to which a sounding is applied. Use this value to prevent over-expansion of the footprint due to large depth spikes or very shallow grazing angles.

Grazing Angle File

Click Browse to locate the Grazing Angle Weights file. If one cannot be found the system file will be used.

Shoalest Depth True Position only

Compute Band

Median

Creates an attribute layer that displays the median values of soundings contributing to the node.

Positional TPU

Creates an attribute layer that displays the Horizontal TPU value for the shoalest sounding used for the Depth Attribute layer.

Depth TPU

Creates an attribute layer that displays Depth TPU value for the Shoalest sounding used for the Depth attribute layer.

Uncertainly Weighting and CUBE only

IHO Order

A sounding’s area of influence (the number of nodes to which a sounding is applied) is determined by the vertical uncertainty limit in the selected S-44 survey order. When a sounding’s vertical uncertainty increases beyond the requirement for the survey order then it cannot contribute to the node.

1. Select an IHO S-44 Order from the drop-down list to apply the default value for the order selected. Select either Special Order, Order1a, Order1b, or Order2.

The constant depth error and factor of depth dependent errors values for the selected order will be automatically applied.

2. Alternatively, select S-44 User Defined from the list, and enable the IHO Limits check box to set values for A and B limits.

See also IHO Survey orders for Uncertainty Weighting.

IHO Limits

To enter limits for S44 User Defined:

1. Click the check box.

2. Type a constant depth error value for the “A Value” field.

3. Select units from the drop-down list. The default unit is metres.

4. Type a value for the percentage of depth used to calculate horizontal (depth-dependent) error in the “B Value” field.

CUBE Weighting only

Disambiguation method

Select a disambiguation method from the drop-down list:

• Density

• Locale

• Density and Locale (default)

• Initialization Surface

These methods are described in Disambiguation.

CUBE Configuration

Default Configuration values will be applied unless you select otherwise.

To apply other configuration options, click the […] Browse button to open the CUBE Advanced Options dialog box and set different configuration values.

See Advanced Options for Configuration - CUBE