Global Positioning System

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html lang="en"> <head> <title> Global Positioning System</title> <link rel="apple-touch-icon" sizes="180x180" href="/graphics/apple-touch-icon.png" /> <link rel="icon" type="image/x-icon" href="/graphics/favicon.ico" /> <link rel="icon" type="image/png" href="/graphics/android-chrome-192x192.png" sizes="192x192" /> <link rel="icon" type="image/png" href="/graphics/android-chrome-512x512.png" sizes="512x512" /> <link rel="manifest" href="/graphics/manifest.json" /> <meta name="msapplication-TileColor" content="#3578b8" /> <meta name="msapplication-TileImage" content="/graphics/mstile-150x150.png" /> <meta name="msapplication-config" content="/graphics/browserconfig.xml" /> <meta name="theme-color" content="#3578b8" /> <link rel="stylesheet" href="/style.css" type="text/css" media="screen" > <link rel="stylesheet" href="/print.css" type="text/css" media="print" > </head> <body> <div id="global"> <div id="header"> <a href="#MainContent" class="hide" title="jump to main content">Jump to main content.</a> <a href="/"><img class="top_logo" src="/graphics/logo2023-psmsl.svg" height="90px" alt="Permanent Service for Mean Sea Level (PSMSL) logo"></a>  </div> <div id="TopMenuBar"> <ul id="level1Nav"> <li><a href="/about_us/" title="About Us" ><span class="TopMenu">    About Us   </span></a></li> <li><a href="/data/" title="Data" ><span class="TopMenu">   Data   </span></a></li> <li><a href="/products/ " title="Products"><span class="TopMenu">   Products   </span></a></li> <li><a href="/gloss/ " title="GLOSS"><span class="TopMenu">   GLOSS   </span></a></li> <li><a href="/train_and_info/ " title="Training and Information" ><span class="TopMenu">   Training   </span></a></li>  <li><a href="/links/ " title="Links" ><span class="TopMenu">   Links   </span></a></li> </ul> </div> <div id="BreadCrumbs"> You are here: <a href="/">home > </a><a href="/train_and_info/">train_and_info > </a><a href="/train_and_info/geo_signals/">geo_signals > </a> </div> <div class="SideBar"> <h2 class="SideBarTitle"> Training & Information</h2> <ul class="SideBarNav1"> <li><a href="/train_and_info/faqs/" >FAQs</a></li> <li class="deep"><a href="/train_and_info/training/" >Sea Level Training</a></li> <li class="deep"><a href="/train_and_info/software/" >Software</a></li> <li class="deep"><a href="/train_and_info/geo_signals/" >Geophysical Signals</a></li> <ul class="SideBarNav2"> <li class="deep"><a href="/train_and_info/geo_signals/gia/">Glacial Isostatic Adjustment</a></li> <li><a href="/train_and_info/geo_signals/gps.php">Global Positioning System</a></li> <li><a href="/train_and_info/geo_signals/atm.php">Atmospheric Pressure</a></li> </ul> </ul> <div> <p class="center_text"> <a href="/about_us/support_us.php" class="donate_button">Donate</a> <br/> Donate to PSMSL </p> </div> </div> <div id="MainContent"> <h1>Global Positioning System at Tide Gauges</h1> <p> As described in the <a href="/train_and_info/geo_signals/">previous web page</a>, vertical land motion can be caused by a number of processes. As the tide gauges are attached to the land, this motion will be reflected in the tide gauge records. For some studies, for example determining rates in the context of inundation at a given location, the tide gauge record is the ideal measurement. However, other studies want to remove the impact of crustal motion to obtain a measurement of sea surface height. This can be achieved by removing estimates vertical land motion derived from global positioning system (GPS) records. This can also reduce (though not remove) the impact of local, non-oceanographic processes in a global analysis of tide gauge records. </p> <p> Considerable progress has been made in obtaining a global set of GPS estimates at tide gauge locations. The International GNSS Service (IGS) has a <a href="http://adsc.gfz-potsdam.de/tiga/index_TIGA.html" target="_blank"> GPS Tide Gauge Benchmark Monitoring</a> pilot project page, while <a href='http://www.soest.hawaii.edu/cgps_tg' target="_blank"> Continuous GPS at Tide Gauges (CGPS@TG)</a> is the classic website for this effort. A set of CGPS-derived rates, along with a survey on the CGPS sites near tide gauges, can be found at the <a href='http://www.sonel.org/-GPS-.html' target="_blank"> SONEL website</a>. Further background on GPS can be found on the <a href="../training/reading/geodesy.php">geodesy reading page</a>. </p> </div> <div class="Footer"> <p> <a href="http://ioc-unesco.org/" target="_blank"><img src="/graphics/ioc_en_color_small_60.png" alt="Intergovernmental Oceanographic Commission logo"></a> <a href="https://worlddatasystem.org/" target="_blank"><img src="/graphics/WDS_LOGO_LONG.png" alt="World Data System logo" height="60px"></a> <a href="http://www.ggos.org/" target="_blank"><img src="/graphics/ggos_logo_60.png" alt="Global Geodetic Observing System logo"></a> <a href="http://www.iag-aig.org/" target="_blank"><img src="/graphics/iag_logo_60.png" alt="International Association of Geodesy logo"></a> <a href="https://www.nerc.ac.uk/" target="_blank"><img id="nerclogo" src="/graphics/ukrinerc.png" alt="Natural Environment Research Council logo" height="60px"></a> </p> </div> </div> </body> </html>

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Global Positioning System