1 / 40

Geophysical data management 2004 in JAMSTEC

Geophysical data management 2004 in JAMSTEC. The comparison of the bathymetric data. INMARETCH2004 Sept. 20th-23rd, 2004 SHINICHI HOSOYA Nippon Marine Enterprises, Ltd. Thankful to : RIE ISHI (NME), MASAYUKI TOIZUMI (NME) TETSUjI MAKI (JAMSTEC), TOSHIO FURUTA (JAMSTEC).

uta
Download Presentation

Geophysical data management 2004 in JAMSTEC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Geophysical data management 2004 in JAMSTEC The comparison of the bathymetric data INMARETCH2004 Sept. 20th-23rd, 2004 SHINICHI HOSOYA Nippon Marine Enterprises, Ltd Thankful to : RIE ISHI (NME), MASAYUKI TOIZUMI (NME) TETSUjI MAKI (JAMSTEC), TOSHIO FURUTA (JAMSTEC)

  2. Introduction From the JAMSTEC web page http://www.jamstec.go.jp/

  3. 1.Motivation Comparison of Bathymetric maps Table of Contents 2.Theory How to get the data 3.Highlight data How to compare the data 4.Summary and future plan

  4. 1.Motivation Bathymetric maps R/V KAIREI SEABEAM R/V NATSUSHIMA SEABAT

  5. KAIREI & NATSUSHIMA

  6. SeaBeam & SeaBat

  7. 2.TheorySynthesis of cross fan-beam Synthesis of cross fan-beams Multi beam prepared by a transmit fan-beam And multiple receive fan-beam

  8. Beam Footprint narrow wide

  9. Block diagram Navigation Processor Interface Recording Mapping Motion Sensor Sound Velocity transceiver On the ship In the water

  10. 3.High light data 1)Chose the area from the track line 2)Edit the raw data 3)Average the data 4)XYZ comparison Where X: longitude,Y: latitude, Z: depth Compare the Z value with SEABEAM & SEABAT

  11. 1)Cruise Track Line • Blue line • (SeaBeam) • Ship speed 10.0knt • Red line • (SeaBat) • Ship speed 11.3knt

  12. KR NT Bathymetric map

  13. 2)The data before editing Y : the number of pings X : the distance of the width

  14. The data after editing

  15. N ＋ ＋ ・・・ ＋ ＝ N 3)Average the data 50m 50m

  16. 50m 138.625E/138.675E/34.975N/35.012N 50m 4000m 4000m Choose SEABEAM & SEABAT data

  17. Beam Footprint 1400m 50m

  18. 4)X-Y comparison Y R KR NT R = 25m Data 21930 X

  19. Z comparison KRz Z NTz Δd= KRz - NTz Y X

  20. NTz m (SEABAT) Depth comparison KRz m (SEABEAM)

  21. Histogram COUNT Δd:Average=5.1m Δd (m)

  22. Summary and future plans ・ SEABEAM & SEABAT bathymetric data were almost the same. But, the average depth of the SEABAT data was less than the SEABEAM data. ・ We need check the data from another area and a shallower and deeper area.

  23. Almost the same map Thank you for your attention

  24. Sound Velocity • Using SeaPatch tool

  25. edit SVP After change the Sound Velocity

  26. Histogram COUNT Δd:Average=-0.1m Δd (m)

  27. A term • KR04-00(08/03/2004 - 16/03/2004) 11/03/2004 Ship speed 10.0knt Current 110.2°, 0.5knt Wind 217.1 °, 13.4m/s • NT04-00(23/01/2004 - 07/02/2004) 29/01 + 01/02/2004 Ship speed 11.3knt Current 260.1°, 2.0knt Wind 236.2 °, 0.3m/s

  28. R/V KAIREI • Length105.2m • Wdth16.0m • Depth7.3m • Draft4.5m • Displacement 4,628ton

  29. M/V NATSUSHIMA Length 67.4ｍ　 Wdth13.0ｍ　 Depth6.3ｍ Draft3.6ｍ　 Gross tonnage 1,739ton

  30. VRU Morison sensor • KR…. • NT…OCTAN

  31. Synthesis of cross fan-beam transmit fan-beam（①） receive fan-beam（②） cross fan-beam by synthesis effect（③） ② ① ③

  32. Brock diagram - manga Motion Sensor Navigation Interface Recording Mapping transceiver Sound Velocity

  33. raw edit Bathymetric map before and after edit

  34. 調査時期 • KR04-01(2004/01/07-2004/01/25) 18/01/2004 Ship speed 10.1knt Current 167°, 1.2knt • NT04-06(2004/06/17 - 2004/06/23) 17/06/2004 Ship speed 8.8knt Current 209°, 0.2knt

  35. A process to verify an error誤差検証過程 1.Edit the data 2.Average the data 3.Grid Setting 4.XYZ Normal distribution

  36. Between KR to NT Δd (m) XY Distance from KR to NT

  37. Grid Setting Choosing grids setting from the manual: G = 100m G = D * F / b Where G : an average grid cell size D : the water depth F : the swath coverage factor b : the number of beams

  38. KR NT Bathymetric map after edit

  39. Estimation • Slope 0.954 • Average Δd 5.1m SEABEAM & SEABAT have a line correlation. Average depth is shallower SEABAT than SEABEAM. Δd is not varied. It’s like a pointed mountain.

More Related