Output file

The name and location for the resulting ASCII file.

Coordinate reference system

The coordinate reference system (CRS) to use for the export. The CRS of the input coverage is selected by default.

1. Click the browse (...) button to launch the Select Coordinate Reference System dialog box. See Coordinate Reference System Selection 107for information on using this tool.

2. Select a CRS and click OK.

Available

All attributes in the input coverage that are available for export. Attributes can be added to the Selected list multiple times, allowing the values to be exported with different units and precision.

1. Select the desired attribute in the Available list.

2. Click the right-arrow button to move it to the Selected list.

Selected

The attributes of the input coverage that have been selected to be included in the export.

The order of the attributes in this list controls the order of the attributes in the output file. The order can be changed as needed using the up-arrow and down-arrow buttons when an attribute is selected in the list.

Attributes can also be removed from the Selected list using the left‑arrow button.

1. Select an attribute in the Selected list.

2. Click the up-arrow or down-arrow button to change the order of the attributes.

Unit/Format

The horizontal position units or format to use for the values of the active attribute. The following units are supported:

ac, cable, ch, cm, cm2, day, dB, deg, deg/s, fm, fm2, ft, ft/s, ft2, ft3, ha, hour, in, inm, km, km/h, km2, kn, m, m/s, m2, m3, mi, mi/h, mi2, min, mm, mm2, nm, nm2, rad, rad/s, sec, usac, usfm, usfm2, usft, usft/s, usft2, usft3, usmi, usmi/h, usmi2, usnm, usyd, usyd2, usyd3, week, yd, yd2, yd3, DD, D-M, D-M-S, DMS

The units available differ depending on the data type of the selected attribute.

• For band values, all supported distance units are available.

• For position values, the available options depend on the selected CRS:

• For a projected CRS, the list includes all available units and formats and defaults to metres.

• For a geographic CRS, the list includes angular units only and defaults to DMS (N/S/E/W).

The selected unit for position values also controls the column headings that will be populated in the output file, if the Include headers option is enabled.

• For distance units, headings will be X and Y

• For angular units, headings will be Latitude and Longitude

This field is disabled if the selected attribute contains unitless values.

1. Select the attribute in the Selected list.

2. Select a unit/format from the drop-down list.

Precision

Assign a precision value to each attribute being exported. The precision determines the number of decimal places in the exported values. Up to nine decimal places are allowed.

1. Select the attribute in the Selected list.

2. Select or type a precision value in the field.

Delimiter

The character used to separate attribute values in the ASCII file. This character makes it easier to distinguish the exported values for each attribute. A space, comma, or tab are provided as options, but any single alphanumeric character can be used.

Filter attributes

On: Filter out data you do not want included in the export, for example, interpolated nodes. Filtering is performed according to attribute values using an equation built in the Filter Attributes dialog box, which is launched from the Filter attributes browse (...) button. See Filter Attributes for information on using the Filter Attributes dialog box.

Off: All data is exported for the selected attributes.

Include headers

On: The first row of the ASCII file is populated with column headers for the selected attributes.

Off: The first row of the ASCII file is populated with attribute values.

Include rejected

On: Include rejected soundings in the export. By default, soundings flagged as rejected are not included to ensure that a clean surface can be created from the exported data.

Off: Rejected soundings are excluded from the export.

Z-axis convention in output

Define the Z-axis convention of the data in the exported file. By default, the export will use the direction defined in the Z-axis Convention option in the Coverages category of Tools > Options, but this setting will override that setting. If the exported Z values are required to be Z-axis positive up, select Up is positive. If the exported Z values are required to be Z-axis positive down, select Down is positive.

Bin

Nodes in the selected coverage can be exported as binned (each in its original position in the grid cell). Click the check box to enable the binning options.

Size

If full resolution is not required for the data, a lower resolution size can be specified.

Bias

Export the data with either a shoal or deep bias.