Global Geology Grids

Data set Reference (their format, may not match ours or yours, so reformat if necessary) Web site Notes
ETOPO1 topography and bathymetry Amante, C., and Eakins, B.W., 2009, ETOPO1  1 Arc-Minute Global Relief Model: Procedures, Data Sources and Analysis: NOAA Technical Memorandum NESDIS NGDC-24, 19 p.  http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO1/docs/ETOPO1.pdf   Download  ETOPO1

This has ocean bathymetry and land elevations. 
  • Floating point binary version is probably the best.  Save it as a 16 bit integer, since the floating point values are actually integers.
  •  GRD98 version has registration that is misinterpreted by 1 degree in longitude because of byte swapping issues in MICRODEM, so do not get that version.
  • The Geotiff version  is not registered, so you must create a world file for it.
SRTM 30 Plus Becker, J. J., D. T. Sandwell, W. H. F. Smith, J. Braud, B. Binder, J. Depner, D. Fabre, J. Factor, S. Ingalls, S-H. Kim, R. Ladner, K. Marks, S. Nelson, A. Pharaoh, R. Trimmer, J. Von Rosenberg, G. Wallace, P. Weatherall., Global Bathymetry and Elevation Data at 30 Arc Seconds Resolution: SRTM30_PLUS, Marine Geodesy, 32:4, 355-371, 2009.
http://topex.ucsd.edu/WWW_html/srtm30_plus.html SRTM 15+ for smaller areas, more detail
Sediment thickness Current version 3: Straume, E.O., Gaina, C., Medvedev, S., Hochmuth, K., Gohl, K., Whittaker, J. M., et al. (2019). GlobSed: Updated total sediment thickness in the world's oceans. Geochemistry, Geophysics, Geosystems, vol.20. DOI: 10.1029/2018GC008115

Older version 2: Whittaker, Joanne, Alexey Goncharov, Simon Williams, R. Dietmar Muller, German Leitchenkov (2013) Global sediment thickness dataset updated for the Australian-Antarctic Southern Ocean, Geochemistry, Geophysics, Geosystems. Volume 14, Issue 8, DOI: 10.1002/ggge.20181

Oldest version 1: Divins, D.L., Total Sediment Thickness of the World's Oceans & Marginal Seas, NOAA National Geophysical Data Center, Boulder, CO, 2003.



http://www.ngdc.noaa.gov/mgg/sedthick/index.html Grid in Geotiff and other less useful formats.  If Geotiff is not present, MICRODEM via GDAL can read the nc file.  The current version 3 still has v2 in the file names, but the data hole near Japan has been filled in.
Sediment type distribution Adriana Dutkiewicz, R. Dietmar Muller, Simon O'Callaghan, and Hjortur Jonasson, 2015, Census of seafloor sediments in the world's ocean Geology, 43 (9): 795–798. G36883.1,  doi:10.1130/G36883.1,    http://geology.gsapubs.org/content/43/9/795.full ftp://ftp.earthbyte.org/papers/Dutkiewicz_etal_seafloor_lithology  
Predicted sea floor ages.
  • Current verson: Muller, R.D., M. Sdrolias, C. Gaina, and W.R. Roest 2008. Age, spreading rates and spreading symmetry of the world's ocean crust, Geochem. Geophys. Geosyst., 9, Q04006, doi:10.1029/2007GC001743.
  • Original version: MÜLLER, Roest, Royer,Gahagan, and Sclater (1997) in Journal of Geophysical Research.
Version 3: http://www.ngdc.noaa.gov/mgg/ocean_age/ocean_age_2008.html Derived from models of plate spreading.  There is a value about every 11 km.  There is no data on continental crust, and problematic regions of oceanic crust.
Magnetic anomaly maps EMAG2: 2 arc minute grid, available as Geotiff
  • Version 3: Brian Meyer, Richard Saltus, Arnaud Chulliat (2016): EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution) Version 3. National Centers for Environmental Information, NOAA. Model. doi:10.7289/V5H70CVX, accessed 13 Aug 2016.
  • Version 2:  Maus, S., Barckhausen, U., Berkenbosch, H., Bournas, N., Brozena, J., Childers, V., Dostaler, F., Fairhead, J. D., Finn, C., von Frese, R. R. B., Gaina, C., Golynsky, S., Kucks, R., Luhr, H., Milligan, P., Mogren, S., Muller, R. D., Olesen, O., Pilkington, M., Saltus, R., Schreckenberger, B., Thebault, E., and Caratori Tontini, F. 2007, EMAG2: A 2–arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements: Geochemistry, Geophysics, Geosystems, vol. 10, no.8, DOI 10.1029/2009GC002471.
http://www.geomag.us/models/emag2.html  
EGM2008: Geoid The development and evaluation of the Earth Gravitational Model 2008 (EGM2008) - Nikolaos K. Pavlis, Simon A. Holmes, Steve C. Kenyon, John K. Factor; Journal of Geophysical Research: Solid Earth (1978-2012) Volume 117, Issue B4, April 2012    


Larger scale DEMs, like  SRTM, MERIT, or ASTER GDEM,  provide good base maps for almost any geoscience-related project.  The grayscale hillshade provides an excellent starting map.


Last revision 1/26/2020