= RFC 24: GDAL Progressive Data Support = 

Author: Norman Barker[[BR]]
Contact: nbarker@ittvis.com[[BR]]
Status: Development

== Summary ==

Provide an interface for data streaming support in GDAL.  The RFC focuses on JPIP, but should be generic enough to apply to other streaming / progressive formats.

== Definitions ==

'''JPIP''': JPEG 2000 Interactive Protocol

== Objective ==

To provide an interface to a streaming data source in a convenient manner for RasterIO operations within GDAL and to expose this interface via swig.

== JPIPKAK - JPIP Streaming ==

JPEG 2000 Interactive Protocol (JPIP) flexibility with respect to random access, code stream reordering and incremental decoding is highly exploitable in a networked environment allowing access to remote large files using limited bandwidth connections or high contention networks.

=== JPIPKAK - JPIP Overview ===

A brief overview of the JPIP event sequence is presented in this section, more information can be found at [http://www.jpeg.org/jpeg2000/j2kpart9.html JPEG 2000 Interactive Protocol (Part 9 – JPIP)] and the specification can (and should) be purchased from [http://www.iso.org/ ISO].

An earlier version of JPEG 2000 Part 9 is available here [http://www.jpeg.org/public/fcd15444-9v2.pdf], noting the ISO copyright, diagrams are not replicated in this documentation.

The JPIP protocol has been abstracted in this format driver, requests are made at the 1:1 resolution level.