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Generic Data Format structure contains 9 variables, where d is the most essential one, because it contains the data which can be further processed. The other variables are used for the correct data description – units, coordinate system, fields etc.
GDF file name following the scheme: GDF_EPISODENAME_file_description.
The structure of Generic Data Format
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Variable name
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Type
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Description
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CRS
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char
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Coordinate Reference System
EPSG code (or local) mapping surveying (http://epsg.io), standard WGS84 (EPSG: 4326). If not applicable input ‘n/a’.
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d
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struct
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The variable containing the data. The data may be as a single variable, a vector or an array. Data name following the scheme: Name_of_parameter or NAME (for shortcuts, chemical formulas etc.)
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Description
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char
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The text description of the data contained in the file
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FieldDescription
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cell
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Description of the fields. An array contains two columns: the first contains the name of the field/column of data, the second contains a description of them. All data must be specified
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FieldType
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cell
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An array contains two columns: the first contains the name of the field/column of data, the second contains the data type number. All data must be specified. The Numbers of Data type:
1 – the real data without limits,
2 – the integer data,
3 – text value,
4 – the real number rounded to 0.1 (shown as 11),
5 – time in Matlab format serial time – the time display format; seconds with accuracy 1/10,
6 – the real data display in an engineering manner with one decimal place, e.g.: 3.5E6, (obsolete, recommended 2cd)
7 – the real data display in an engineering manner with two decimal place, (obsolete, recommended 2cd)
bc – (b and c are code digits) the real data is displayed in fix-point manner with at minimum b places before decimal and c decimal place,
e.g. For number 3.149.
10: „3”
11: „3.1”
12: „3.15”
20: „03”
23: „03.149”
1bc– the same manner as bc, but with place for a sign (space for sign „+”, sign ‘-’ for sign „-”),
2cd– (c and d are code digits), the real data is displayed in an engineering manner, with place for a sign (space for sign „+”, sign ‘-’ for sign „-”), with c decimal place and exponent expressed by d places. The sign in exponent is always displayed.
e.g. For number 0.001 211: „1.0E-3” 221: „1.00E-3” 212: „1.0E-03” 222: „1.00E-03” | e.g. For number 1000 211: „1.0E+3” 221: „1.00E+3” 212: „1.0E+03” 222: „1.00E+03” |
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FieldUnit
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cell
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Description of units for individual data, e.g. m/s. An array contains two columns: the first contains the name of the field/column of data, the second contains the unit. All data must be specified.
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FormatName
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char
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Name of data format GDF (Generic Data Format).
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FormatVersion
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double
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When changing/expansion of the format change its version. It can have one number after the decimal point.
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TimeZone
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char
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Acronym of Time Zone (http://en.wikipedia.org/wiki/List_of_time_zone_abbreviations) from the episode of origin. If not applicable input ‘n/a’.
Existing types of GDF
AIR QUALITY
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Overview
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