GDF - description
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
| Variable name | Type | Description |
|---|---|---|
| CRS | char | Coordinate Reference System EPSG code (or local) mapping surveying (http://epsg.io), standard WGS84 (EPSG: 4326). If not applicable input ‘n/a’. |
| d | struct | 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.) |
| Description | char | The text description of the data contained in the file |
| FieldDescription | cell | 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 |
| FieldType | cell | 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, - 5a - time containing only year value e.g. '2010', the time display format: year '2010' - 5b - time containing only year and month value e.g. '2010-01', the time display format: year month e.g. '2010 Jan' - 5<pattern> - time read from string with the provided pattern, specified according to the table: symbols: year: 'y' month: 'M' day: 'd' hour: 'H' minute: 'm' second: 's' mili- , micro-second: 'S' — examples: "5yyyy MMM dd HH:mm:ss" result: "2010 Jan 23 14:15:20" "5yyyy-MM-dd" result: "2010-01-23" "5HH:mm:ss.SSS" result: "14:15:20.454" "5HH:mm:ss.SSSSSS" result: "14:15:20.454323" 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” |
| FieldUnit | cell | 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. |
| FormatName | char | Name of data format GDF (Generic Data Format). |
| FormatVersion | double | When changing/expansion of the format change its version. It can have one number after the decimal point. |
| TimeZone | char | 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’. |