National Transfer Format

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The National Transfer Format (NTF) is a file format designed in 1988 specifically for the transfer of spatial information; it is administered by the British Standards Institution. It is now the standard transfer format for Ordnance Survey digital data. The present version (2.0) conforms to BS 7567.

A file format is a standard way that information is encoded for storage in a computer file. It specifies how bits are used to encode information in a digital storage medium. File formats may be either proprietary or free and may be either unpublished or open.

(Source:- Ordnance Survey (GB) web site)

Do not confuse this with the US' National Imagery Transmission Format.

The National Imagery Transmission Format Standard (NITFS) is a U.S. Department of Defense (DoD) and Federal Intelligence Community (IC) suite of standards for the exchange, storage, and transmission of digital-imagery products and image-related products.

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