CSV (comma separated values)

What are comma separated values (CSV)?

CSV files are used to transfer data sets between information systems that do not use the same (propriarity) data format. For example, by using the CSV format, data from a data base in a propriarity format can be transferred to a spread sheet program with another propriarity format.

Comma separated values (CSV) is a specification of this tabulated data, where the data is stored on single lines in a text based file and entries are separated with a comma or other character.

In the Anglo Saxon influence sphere, commas are in use as separators. However, in the rest of the world commas are already in use as decimal separators and periods as thousand-separators, hence the use of semi colons in stead in these regions.

When copying an HTML table into memory, to paste it in plain text or spreadsheet, the tab character ('\t') is automatically used as separator.

A CSV file can be created and read with a simple text editor. The file consists of line entries that correspond with the rows in a spreadsheet. Each line (row) has the same number of (column) entries, separated with a comma or other separator. The first line can be used to name column headers of the resulting table. Lines are sometimes ended with only a line feed and no carriage return, which results in the text being displayed in a text editor as one single line without separation per table row. Spreadsheets can ususally read these line feeds without problem, ordering the data in its proper rows again.

You can create your own CSV file, as shown below:

We have a simple data set of some produce: 10 apples, 5 oranges, 1 tomatoe and 3 onions. We would like to create a table from a CSV file with headers that displays the name, type, color and quantity.

We begin with the first line of column headers:

name; type; color; quantity

Then we add the first data record:

name; type; color; quantity
apple; fruit; green; 10,0

Now we add the other entries, resulting in a European CSV file, where the decimal separator is a comma and the value separator is a semicolon:

name; type; color; quantity
apple; fruit; green; 10,0
orange; fruit; orange; 5,0
tomatoe; vegetable; red; 1,0
onion; vegetable; yellow; 3,0

This CSV file will result in a similar table as below, when importing the file in a spread sheet program:

name	type	color	quantity
apple	fruit	green	10,0
orange	fruit	orange	5,0
tomatoe	vegetable	red	1,0
onion	vegetable	yellow	3,0

An example of the data as a USA/UK CSV file, where the decimal separator is a period and the value separator is a comma:

name, type, color, quantity
apple, fruit, green, 10.0
orange, fruit, orange, 5.0
tomatoe, vegetable, red, 1.0
onion,  vegetable, yellow, 3.0

Which will result in the following table:

name	type	color	quantity
apple	fruit	green	10.0
orange	fruit	orange	5.0
tomatoe	vegetable	red	1.0
onion	vegetable	yellow	3.0

Most programs that can receive CSV files, provide an option to select the locality (USA/UK vs European), when importing the file.

CSV (comma separated values) and the Tygron Geodesign Platform

Link to attribute arrays You can use , ; \t etc Csv can contain 10.000 time steps

See also

Importeren en exporteren van grote hoeveelheden data met .csv en timestamps (Dutch only)

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