Datums

• Horizontal: [read-only]

• Vertical: The datum for altitude of object, clearances, and so on. Select from the list.

• Sounding: The datum for sounding depths, wrecks, and so on. Select from the list.

Units

• Depth: Units for hydrographic depth values. Select from the list.

• Height: Units for topographic elevations values. Select from the list.

• Accuracy: Accuracy of feature positions. Select from the list.

Compilation Scale

The compilation scale of the product. Type in box.

Coordinate Multiplication Factor

The factor used to convert floating point values to integers. This will avoid potential problems in the way computer platforms interpret floating point values. It is chosen by the data producer and is applied to the entire data set. Usually it is based on the resolution of the source data set.

Sounding Multiplication Factor

The factor used to convert a floating point three-dimensional sounding value to an integer and vice versa. This will avoid potential problems in the way computer platforms interpret floating point values. The default value is chosen by the data producer.

Sounding Rounding

The rule used when rounding or truncating sounding depths. Select from the list.

Comment

Additional information. Type in the box.

Lexical Level

Lexical levels are used to indicate what character sets are used in product attributes values. Most attributes must be defined in English. National language attribute values can contain equivalent names in other languages.

• Lexical Level 0 contains English-language letters, numbers, and special characters such as dollar sign, spaces and brackets.

• Lexical Level 1 is Lexical Level 0 plus extended characters including French accents, operands (e.g., divide and multiply).

• Lexical Level 2 attributes are Unicode text (two-byte characters) which support languages that cannot be supported by Lexical Level 1. HPD supports all the above Lexical Levels.