Nature · Horizon Deep · South Pacific · 2019 grid
Tonga Trench: depth and source profile
This surveyed section of Tonga Trench reaches approximately 10,820 meters below the EGM96 geoid.
≈ 10,820 m
Data-derived estimate- Measurement
- Depth below EGM96 geoid · 75-meter survey grid
- Subject or version
- Horizon Deep · South Pacific · 2019 grid
- In feet, rounded
- 35,499.2 ft (1 ft = 0.3048 m)
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A little more perspective
401 unchanged 75-meter raster cell centers along a 30-kilometer section. Depth is negative raster elevation. No interpolation, missing-cell filling, datum transformation or vertical exaggeration. Straight segments connect measured cells; they are not additional soundings. The section reaches 10820.15625 meters at -23.266430°, -174.742005°. Stored decimals preserve the raster value, not centimeter accuracy. Both ends remain underwater.
The Five Deeps study reports 10,816 ± 16 meters at Horizon Deep, the second-deepest ocean location in that study. The published analysis and this archived grid are separate results. Neither the profile nor its vertical datum has been adjusted to force agreement. The acquisition report identifies EGM96 as its geoid reference.
Horizon Deep lies east of Tonga. The displayed section runs south to north along a single survey-grid column. Its ends are underwater survey boundaries, not coastlines.
Quick facts
This surveyed section of Tonga Trench reaches approximately 10,820 meters below the EGM96 geoid.
For a presentation or a research note, include the subject, the measurement definition, and the measurement used. A picture alone cannot explain those choices. The comparison guide explains how to export an image and its source notes together.
Sources and measurement notes
- NOAA NCEI: PD19TT02 survey archive
- Caladan Oceanic: acquisition report, geoid reference in section C.3
- Bongiovanni, Stewart and Jamieson (2021): Five Deeps bathymetry study
Compare measured sections with their source and datum intact; do not treat grid precision as survey accuracy.
Source review recorded . Suggest a correction with a source and the exact measurement being compared.