Networked Transport of RTCM via Internet Protocol
{{for|the school|Niagara County Community College}}
The Networked Transport of RTCM via Internet Protocol (NTRIP) is a protocol for streaming differential GPS (DGPS) corrections over the Internet for real-time kinematic positioning.
NTRIP is a generic, stateless protocol based on the Hypertext Transfer Protocol HTTP/1.1 and is enhanced for GNSS data streams.{{cite journal|last=Lenz|first=Elmar|title=Networked Transport of RTCM via Internet Protocol (NTRIP) – Application and Benefit in Modern Surveying Systems|journal=FIG Working Week 2004 |year=2004 |url=https://www.fig.net/resources/proceedings/fig_proceedings/athens/papers/ts03/ts03_2_lenz.pdf}}
The specification is standardized by the Radio Technical Commission for Maritime Services (RTCM).{{cite web |url=http://igs.bkg.bund.de/ntrip/about|title=about NTRIP|accessdate=17 January 2012}}
NTRIP was developed by the German Federal Agency for Cartography and Geodesy (BKG)[https://web.archive.org/web/20160329165844/http://www.bkg.bund.de/EN/Home/homepage__node.html__nnn=true BKG] and the Dortmund University Department of Computer Science.[http://www.cs.uni-dortmund.de/nps/en/Home/index.html Uni Dortmund] Ntrip was released in September 2004.[http://igs.bkg.bund.de/root_ftp/NTRIP/documentation/NtripPressRelease.pdf "RTCM Recommended Standards for Networked Transport of RTCM via Internet Protocol (Ntrip), Version 1.0"] The 2011 version of the protocol is version 2.0.[https://web.archive.org/web/20160304071708/https://ssl29.pair.com/dmarkle/puborder.php?show=3 Version 2.0 with Amendment 1, June 28, 2011]
NTRIP used to beThe "public version" of the protocol is missing all protocol details and examples, and refers to purchase the document from RTCM; it can be downloaded from [http://igs.bkg.bund.de/root_ftp/NTRIP/documentation/NtripDocumentation.pdf BKG]. an open standard protocol but it is not available freely (as of 2020). There is an open source implementation available from [http://software.rtcm-ntrip.org/ software.rtcm-ntrip.org] from where the protocol can be reverse-engineered.