Blue Earth Bathymetry is an edited version of GEBCO (General Bathymetric Chart of the Oceans), a public domain dataset that combines ocean bottom and land elevation data of the entire world. Because GEBCO derives from a mix of data sources and contains noisy artifacts, I created Blue Earth as a cleaner alternative for making smallscale maps of the seafloor. Making it involved an unorthodox editing procedure to remove artifacts, which could only be done in Adobe Photoshop and Geographic Imager. Blue Earth Bathymetry is available for free as a GeoTIFF DEM at 60arc second resolution (21,600 x 10,800 pixels).

Tom Patterson worked as a cartographer at the U.S. National Park Service, Harpers Ferry Center, until retiring in 2018. He has an M.A. in Geography from the University of Hawai‘i at Mānoa. Presenting terrain on maps is Tom’s passion. He publishes the ShadedRelief.com website and is the codeveloper of the Natural Earth dataset and the Equal Earth projection. Tom has served as President and Executive Director of the NACIS. He is now Vice Chair of the International Cartographic Association, Commission on Mountain Cartography.

The Avenza User Conference is an opportunity to discover exciting new developments with Avenza's GIS and cartographic solutions and to connect with peers and Avenza team members. Avenza users and staffers from around the globe meet virtually each May to learn what's new with Avenza Maps, MAPublisher, Geographic Imager, and the Avenza Map Store, and see how they are being used to map our world.

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