Global Bathymetry and Topography at 15 Arc Sec: SRTM15+

Abstract

An updated global bathymetry and topography grid is presented using a spatial sampling interval of 15 arc sec. The bathymetry is produced using a combination of shipboard soundings and depths predicted using satellite altimetry. New data consists of >33.6 million multibeam and singlebeam measurements collated by several institutions, namely, the National Geospatial‐Intelligence Agency, Japan Agency for Marine‐Earth Science and Technology, Geoscience Australia, Center for Coastal and Ocean Mapping, and Scripps Institution of Oceanography. New altimetry data consists of 48, 14, and 12 months of retracked range measurements from Cryosat‐2, SARAL/AltiKa, and Jason‐2, respectively. With respect to SRTM15_PLUS (Olson et al.,), the inclusion of these new data results in a ∼1.4‐km improvement in the minimum wavelength recovered for sea surface free‐air gravity anomalies, a small increase in the accuracy of altimetrically derived predicted depths, and a 1.24% increase, from 9.60% to 10.84%, in the total area of ocean floor that is constrained by shipboard soundings at 15‐arc sec resolution. Bathymetric grid cells constrained by satellite altimetry have estimated uncertainties of ±150 m in the deep oceans and ±180 m between coastlines and the continental rise. Onshore, topography data are sourced from previously published digital elevation models, predominately SRTM‐CGIAR V4.1 between 60°N and 60°S. ArcticDEM is used above 60°N, while Reference Elevation Model of Antarctica is used below 62°S. Auxiliary grids illustrating shipboard data coverage, marine free‐air gravity anomalies, and vertical gradient gradients are also provided in common data formats.

Potential Hydrodynamic Impacts and Performances of Commercial-Scale Turbine Arrays in the Strait of Larantuka, Indonesia

“…Tidal stream currents were computed with the FLOW module of the Delft3D Modeling System, developed by Deltares, the Netherlands [17,18]. Bathymetric data for the hydrodynamic models have been obtained from single beam echo sounding surveys and SRTM15_PLUS land and sea topography global dataset [19,20]. An overall model to simulate flow conditions in several interlinked straits, including the Strait of Larantuka, was developed with horizontal grid spacing around 300 m (Figure 1, top).…”

Hurricane Deposits on Carbonate Platforms: A Case Study of Hurricane Irma Deposits on Little Ambergris Cay, Turks and Caicos Islands

“…We used a large-domain hydrodynamics model, the Advanced Circulation model (ADCIRC) (Luettich et al, 1992) tightly coupled to the Simulating WAves Nearshore (SWAN) model (Booij et al, 1999;Dietrich et al, 2011), to estimate water level heights, storm surge, and significant wave height in the nearshore zone of LAC (Egbert & Erofeeva, 2002;Garzon et al, 2018;Li et al, 2013;Sahoo et al, 2019;Westerink et al, 2008). The model domain was set up as an unstructured grid (Roberts et al, 2019), allowing for ingestion of detailed bathymetry of the shallow carbonate platform (Harris & Ellis, 2008) and the shoreline of LAC (supporting information Figures S1 and S2) (Tozer et al, 2019;Wessel & Smith, 1996). Hindcasted parameters (storm track, radius of maximum winds, minimum central pressure, maximum sustained winds, etc.)…”

A global geographic grid system for visualizing bathymetry

“…Although predicted bathymetry is published in a global compilation at 15 arcsec resolution (approx. 463 m) (Tozer et al, 2019), the minimum size of features that can be resolved is actually much larger than this, because it is limited by the footprint of the satellite sensors and other environmental factors such as wind and wave effects (Smith et al, 2005). Typically, features smaller than 5-15 km horizontally cannot be resolved from predicted bathymetry alone.…”