How to conduct a Bathymetric Survey

[@nsikakobongeyakz4032]

thank you for the video i have a little problem, with reducing the soundings to a datum..... LAT, MHWL, MLWL, MSL, MTL.... and how to do you merge levels from a tidal benchmark, to a tide gauge and use such data to reduce soundings... thanks for your help, if there is a contact person, I will love to discuss more on this. I have a B.Sc in Geoinformatics and Surveying, and I have a considerable amount of experience in bathymetric survey

[@ExoEnvironmental]

We use software called Teledyne PDS which handles all of the processing in-software. We also use RTK GNSS throughout the survey to correct for the tide as that is much more accurate than using tidal gauges. The chart datum (typically LAT) can usually be obtained from navigational charts or the local authority depending on location. The Z correction is then applied on the measured GNSS data. Hope this is helpful!

[@nsikakobongeyakz4032]

@@ExoEnvironmental it's ok. Thank you, But can you make this a little more detailed.. if you have sketches or videos where this is done that will be more helpful.

[@nsikakobongeyakz4032]

@@ExoEnvironmental is there any number or email I can contact to have a detailed discussion.

[@ExoEnvironmental]

​@@nsikakobongeyakz4032 The methodology depends on the exact equipment used, which makes it hard to produce general tutorial videos on specific equipment / software. These should be available from the manufacturer. Feel free to take a look at our website for more information of Bathymetry (exo-env.co.uk/bathymetry/). You can send an email through our contact page!

[@nsikakobongeyakz4032]

@@ExoEnvironmental thank you so much

[@JK-xn2jt]

Hi, I was wondering how do you guys do a survey in a shallow water? are u guys still using a sounding pole?

[@ExoEnvironmental]

Hello! The echosounder is able to function correctly up to a depth of 50cm. Any shallower water and the echosounder will actually pick up the internal casing, and subsequently produce too many errors. In a tidal environment shallow water is surveyed at low tide with drone photogrammetry. Whilst shallow static water bodies will have to be surveyed by topographic survey pole. All three types of data collection can be merged in our software, to create one chart, map or model.

[@sitinuraishah1710]

can you please explain why the measurement and the determination of transducer's draft is important in bathymetric survey??thank you in advance

[@ExoEnvironmental]

Hello, thank you for your question! It is important to know the draft of the transducer if you are using a tide gauge to correctly georeference the depths measured to the relevant datum. In our case, the tide correction is done with RTK GNSS, so the draft itself is not important but the offset between the GNSS antenna and the transducer is used instead. I hope this helps!

[@sitinuraishah1710]

@@ExoEnvironmental thankyou sm sir..really appreciate for the ans

[@mogesie1991]

your video is really good but it is very short means lack of detail explanation please upload other video that start from initially up to end.

[@leyowl]

Hy, i'm asking how to became hydrographic surveyor, I have bachelor degree in Geoinfomatics Which institute do you suggest?

[@ExoEnvironmental]

Hi Mohamed, one idea would be to look at The Hydrographic Society website, they have a page full of relevant courses!

[@HydrographicSurveyor]

thanks for sharing

[@shadanaladin4796]

thankss usefull

[@karatepacan5133]

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