<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><span id="docs-internal-guid-091306cb-7fff-842e-8cf2-2d8126eddaec" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);" class=""><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">Dear GNSS community,</span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">RINEX 4.00 has been approved in the IGS/RTCM RINEX Working Group as the necessary next step for maintaining the suitability of the RINEX format to store GNSS data and measurements. The new format has been officially accepted by the IGS Governing Board on Dec 7, 2021.</span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">The IGS is moving forward to support this new standard. The IGS Infrastructure Committee (IC) has developed a transition plan to foster a short but safe transition. </span><span style="white-space: pre-wrap;" class="">This transition phase has the primary goal to facilitate the acceptance of the new standard in the user community. It is anticipated to be completed within 6 months but depending on user feedback.</span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">The transition plan is available at:</span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><a href="https://nextcloud.gfz-potsdam.de/s/WexMESPRwLpPGLH" style="text-decoration: none;" class=""><span style="color: rgb(17, 85, 204); font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space: pre-wrap;" class="">https://nextcloud.gfz-potsdam.de/s/WexMESPRwLpPGLH</span></a><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class=""> </span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">The first data centres are ready to accept GNSS data in the RINEX 4.00 format. To support the users of our data with the recommended transition, we kindly ask station operators to support this process. Please contact the IGS Central Bureau if you are able to submit </span><span style="font-weight: 700; font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">RINEX versions 3 and 4 in parallel</span><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">. You will receive further guidance on how to proceed with the uploads. Please do not switch to RINEX 4.00 only submission at this time.</span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">The first daily (station wise) RINEX 4.00 observation, navigation and meteorological files have been provided by GFZ and are available from DOY 2022-142 in the CDDIS and BKG archives. For now, they are converted from native RINEX 3.0x files.</span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><a href="https://cddis.nasa.gov/archive/gnss/data/campaign/rinex4/daily/2022" style="text-decoration: none;" class=""><span style="color: rgb(17, 85, 204); font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space: pre-wrap;" class="">https://cddis.nasa.gov/archive/gnss/data/campaign/rinex4/daily/2022</span></a><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class=""> </span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><a href="https://igs.bkg.bund.de/root_ftp/IGS/obs_v4/2022/" style="text-decoration: none;" class=""><span style="color: rgb(17, 85, 204); font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space: pre-wrap;" class="">https://igs.bkg.bund.de/root_ftp/IGS/obs_v4/2022/</span></a></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">Merged native RINEX 4.00 BRDC files (named BRD400DLR) have already been provided by DLR since the start of 2022.</span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">Users, in particular the IGS Analysis Centres, are advised to check and adjust their automated routines to support the processing of RINEX 4.00 files. </span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">Please report any problems back to the IGS CB.</span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">For any correspondence please include:</span></p><ul style="margin-top: 0px; margin-bottom: 0px; padding-inline-start: 48px;" class=""><li dir="ltr" aria-level="1" style="list-style-type: disc; font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre;" class=""><p dir="ltr" role="presentation" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 0pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">Markus Bradke (IC Coordinator, </span><a href="mailto:bradke@gfz-potsdam.de" style="text-decoration: none;" class=""><span style="color: rgb(17, 85, 204); font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space: pre-wrap;" class="">bradke@gfz-potsdam.de</span></a><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">),</span></p></li><li dir="ltr" aria-level="1" style="list-style-type: disc; font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre;" class=""><div style="line-height: 1.38; text-align: justify; margin-top: 0pt; margin-bottom: 0pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">David Maggert (Network Coordinator, </span><a href="mailto:dmaggert@unavco.org" style="text-decoration: none;" class=""><span style="color: rgb(17, 85, 204); font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space: pre-wrap;" class="">dmaggert@unavco.org</span></a><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">), and </span></div></li><li dir="ltr" aria-level="1" style="list-style-type: disc; font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre;" class=""><p dir="ltr" role="presentation" style="line-height: 1.38; text-align: justify; margin-top: 0pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">the IGS Central Bureau (</span><a href="mailto:cb@igs.org" style="text-decoration: none;" class=""><span style="color: rgb(17, 85, 204); font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; text-decoration: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space: pre-wrap;" class="">cb@igs.org</span></a><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">).</span></p></li></ul><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">On behalf of the IGS Infrastructure Committee,</span></p><p dir="ltr" style="line-height: 1.38; text-align: justify; margin-top: 12pt; margin-bottom: 12pt;" class=""><span style="font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; white-space: pre-wrap;" class="">Markus Bradke</span></p></span><div class="">
<meta charset="UTF-8" class=""><div>M.Eng. Markus Bradke</div><div><br class=""></div><div>IGS Infrastructure Committee Coordinator<br class=""><br class="">Section 1.1 Space Geodetic Techniques<br class="">Phone: +49 (0)331/288-1182<br class=""><a href="mailto:markus.bradke@gfz-potsdam.de" class="">Email: markus.bradke@gfz-potsdam.de</a><br class=""><br class="">Helmholtz Centre Potsdam<br class="">GFZ German Research Centre for Geosciences<br class="">Foundation under public law of the federal state of Brandenburg<br class="">Telegrafenberg, D-14473 Potsdam</div>
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