1<!DOCTYPE html> 2<html> 3<head> 4 <title>GMRT</title> 5 <meta charset="utf-8"> 6 <meta http-equiv="Content-Language" content="en-us"> 7 <meta name="Copyright" content="Copyright (c) 2026 Marine Geoscience Data System"> 8 <meta name="Author" content="Design by J. Morton, V. Ferrini, and S. O'Hara"> 9 <meta name="Description" content="GMRT Synthesis - Global Bathymetry"> 10 <meta name="Keywords" content="Ocean, Elevation, Digital Elevation, Maps, Grids, Bathymetry, GeoMapApp"> 11 12 <link rel="stylesheet" type="text/css" href="/css/main.min.css?a=2" media="all"> 13 <link rel="stylesheet" type="text/css" href="/css/smoothness/jquery-ui-1.10.2.custom.min.css" media="all"> 14 <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"> 15 <link rel="shortcut icon" type="image/x-icon" href="/favicon.ico"> 16 <link rel="icon" type="image/x-icon" href="/favicon.ico"> 17 <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png"> 18 <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png"> 19 <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png"> 20 <link rel="manifest" href="/site.webmanifest"> 21 22
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48 49 50<div id="menu-wrap"> 51 <ul id="menu"> 52 <li><a href="/"><i class="fa fa-home" aria-hidden="true"></i></a></li> 53 <li><a style="cursor:pointer">About</a> 54 <ul id="menu_about"> 55 <li><a href="/about/index.php">GMRT Overview</a></li> 56 <li><a href="/about/news.php">News</a></li> 57 <li><a href="/about/related.php">Related Links</a></li> 58 <li><a href="/about/citations.php">Citations</a></li> 59 <li><a href="/about/usage.php">Usage</a></li> 60 <li><a href="/about/contact.php">Contact Us</a></li> 61 <li><a href="/about/terms_of_use.php">Terms of Use</a></li> 62 </ul> 63 </li> 64 <li><a href="/contributors/index.php">Data Sources</a> 65 </li> 66 <li><a style="cursor:pointer">Tools</a> 67 <ul id="menu_tools"> 68 <li><a href="/GMRTMapTool">GMRT MapTool</a></li> 69 <li><a href="/services/index.php">Web Services</a></li> 70 </ul> 71 </li> 72 <li><a href="/about/contribute.php">Contribute</a></li> 73 74 </ul> 75</div> 76<!--<div style="clear:both"></div> 77<div id="container" class="addthis_toolbox addthis_default_style" > 78 <a class="addthis_button_email"></a> 79 <a class="addthis_button_google"></a> 80 <a class="addthis_button_facebook"></a> 81 <a href="http://www.addthis.com/bookmark.php?v=250&pubid=ra-4e568be608ebfd12" class="addthis_button_compact"></a> 82</div> --> 83<!--<div style="clear:both" ></div>--> 84 <div id="content"> 85 <h2>Global Multi-Resolution Topography Data Synthesis</h2> 86 87 <div style="font-size:1.2em;font-weight:100;margin:10px auto;width:500px;padding:5px;background-color:#eeeeff;text-align:center;border-radius:5px;"> 88 Create Custom Maps and Grids with <a href="/GMRTMapTool">GMRT MapTool</a><br /> 89 Now available in <a href="/GMRTMapTool/sp">South Polar</a> and <a href="/GMRTMapTool/np">North Polar</a> Projections! 90 </div> 91 92 <p> 93 The Global Multi-Resolution Topography (GMRT) synthesis is a unique and continually updated 94 global elevation data set that integrates and harmonizes cleaned multibeam sonar data 95 collected by scientists across the worldâs oceans. Each data set is rigorously reviewed, 96 processed, and gridded by the GMRT Team to ensure quality and consistency, then merged into 97 a single, publicly available, multi-resolution compilation. 98 </p> 99 <p> 100 As a foundational data resource for ocean science, GMRT provides seamless access to 101 high-quality elevation data and its wide use demonstrates the enduring value of sustained 102 investment in shared ocean data systems. The inclusion of high-resolution terrestrial 103 elevation data makes GMRT a valuable resource for geoscientific research spanning both 104 oceanic and terrestrial environments. GMRT data and services are accessible through a 105 variety of interfaces and are built into numerous applications across the ocean science and 106 geospatial communities. GMRT has been part of the Google Earth ocean basemap since 2011 and 107 since 2014 has contributed to the GEBCO global bathymetric grid. 108 <a href="/about/">Learn more ></a> 109 </p> 110 <p> 111 GMRT v4.5.0 was released in June 2026 and includes 112 44,896,399 square kilometers of curated multibeam data from 113 1,644 surveys. 114 <br><br> 115 </p> 116 <div id="mapclient"> 117 <h5 style="margin-bottom: 0">Click to Enable<br /> Map Client</h5> 118 </div> 119 120 </div> 121 <div id="footer"> 122<table style="width: 955px; margin:0px auto; border-style: none; "> 123<tr style="border-style: none; "> 124 <td style="border-style: none; width: 60%" > 125 <p> Hosted at <a href="http://www.ldeo.columbia.edu">Lamont-Doherty Earth Observatory</a> of <a href="http://www.columbia.edu">Columbia University</a>.</p> 126 <p>Site licensed under <a href="/about/terms_of_use.php">Creative Commons Attribution 4.0 International</a> </p> 127 <p> 128 <a href="http://www.marine-geo.org/about/legal.php#credits">Acknowledgments</a> | 129 <a class="noline" href="/about/contact.php">Contact</a> | 130 <a class="noline" href="/about/privacy.php">Privacy</a> | 131 <a class="noline" href="/about/terms_of_use.php">Terms of Use</a> 132 </p> 133</td> 134 <td style="border-style: none; width: 5%; "> 135 <a href="http://www.nsf.gov"><img id="nsf_logo" src="/images/nsf1.gif" width="60"></a></td> 136 <td style="border-style: none; width: 20%" > 137 Funded by the <a href="http://www.nsf.gov">US National Science Foundation (NSF)</a> 138 </td> 139</tr> 140</table> 141 142 143</div> 144 145
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