Im looking for a set of suitable data and methodology for mapping ocean bathymetry. Kindly suggest some sources of data and methodology. I will use those data for mapping the ocean floor of Bay of Bengal in Bangladesh portion.
Thanks, Shareful
For a world-scale bathymetry grid, the ETOPO1 maps of NOAA can be found here https://maps.ngdc.noaa.gov/viewers/wcs-client/.
For more detailed bathymetry of ocean areas surrounding europe check EMODnet databases: http://www.emodnet-bathymetry.eu/
Data can be obtained in an xyz ASCII format (three columns of x-cordinates (lon), y-cordinates (lat) and z (elevation), or in NetCDF which can be converted to ASCII.
Also naval maps of navionics can be traced for bathymetry in a certain area, http://webapp.navionics.com/?lang=en. Of course local sources are the best choice as the other user suggested.
The best way to have good and precise data is doing the survey yourself. Multibeam and multiphase bathy systems nowadays can cover 8x-10x water column... so it's not so difficult to cover big areas in a short time. See some data example and discussions on shallow water geophysics facebook too.
This coverage includes bathymetry ...at least I think so!
https://catalog.data.gov/dataset/bathymetric-contours-of-part-of-bay-of-bengal-bath8bg
Indeed, the best data are the data conducted by the survey of the area under interest.
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