Resources

March 29, 2023

1024 beams vs 1024 soundings, are they the same?

Knowledge & Training

The difference lies in the data collection method: interpolated vs independent


Three years ago, R2Sonic was the first MBES manufacturer to launch the “then new” technical mode Ultra High Density (UHD) which consists in collecting 1024 independent soundings, an improvement from the traditional 256 soundings. This 400% increase in number of independent soundings provides greater horizontal resolution and definition of the area surveyed.

We purposely did not increase the number of beams, and instead focused on soundings.  Given that the swath sector is the same, augmenting the number of beams implies adding data points that are calculated as the average of areas of the seabed that have already been accounted by the traditional 256 beams.

The Ultra High Density (UHD) mode, on the other hand, consists in a non-traditional sounding method that is independent from the number of beams, and therefore that does not rely on interpolated data.  As a result, soundings obtained with UHD provide greater detail than classic bottom detect.

The graph below highlights that datapoints collected with a classic bottom detect method fails to capture the details that UHD collects.  The resulting image of the seafloor obtained with interpolated data will look smoother because key features are lost in the calculated average of the footprint.  UHD provides more granularity and accurate representation of the bottom.


coverage   surroundings   uhd   

March 16, 2023

Focus on what matters to you when reviewing a spec sheet

Multibeam echosounders are defined by technical features that are specific to acoustic devices. Some of the technical terms may not initially be intuitive even to surveyors. The objective of this document is to define each technical term to help you understand the importance and implication of each of those concepts in the…


Survey   

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March 29, 2023

MBES can’t be IHO compliant and here is why

MBES and the IHO SP44 Standards for Hydrographic Surveys The International Hydrographic Organisation, based in Monaco, published the 5th edition of Special Publication No 44 Standards for Hydrographic Surveys in February 2008.  SP44 sets forth the minimum standards for survey accuracy. By 2008, multibeam echosounders had been well established as standard equipment for hydrographic…


coverage   iho   Survey   

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March 29, 2023

Tips for surveying over soft & muddy bottoms

Many surveys are in areas that are less than ideal for acoustics.  These types of areas have seafloors that are soft and comprised mostly of mud as opposed to sand or gravel. The multibeam transmitter emits an acoustic pulse that reflects mostly off of the bottom and back to the…


coverage   Resolution   Survey   

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