SEABED IDSEABED ID

HYPACK 2013HYPACK 2013

Seabed ID BasicsSeabed ID Basics

Bottom Roughness:Bottom Roughness: E1 = f(T1,T2)E1 = f(T1,T2) Comparison of the length of time of the returns between the 1st and 2nd echo.Comparison of the length of time of the returns between the 1st and 2nd echo. The rougher the bottom, the longer the 2nd return when compared to the 1st.The rougher the bottom, the longer the 2nd return when compared to the 1st.

Bottom Hardness:Bottom Hardness: E2 = f(V1,V2)E2 = f(V1,V2) Comparison of the volume of acoustic energy returned between 1st and 2nd echo.Comparison of the volume of acoustic energy returned between 1st and 2nd echo. The softer the bottom, the lesser the acoustic energy is measured on the 2nd The softer the bottom, the lesser the acoustic energy is measured on the 2nd

return.return.

NOTE: NOTE: RoxAnn System requires that the Echosounder is set to a minimum Pulse RoxAnn System requires that the Echosounder is set to a minimum Pulse Length of 600 microseconds, in order to properly calibrate and receive valid dataLength of 600 microseconds, in order to properly calibrate and receive valid data..

Seabed Identification XML (SIX)Seabed Identification XML (SIX)

Different bottom and vegetationDifferent bottom and vegetation types exhibit different Roughness (E1) types exhibit different Roughness (E1) and Hardness (E2) properties.and Hardness (E2) properties.Sand Mud ClaySand Mud ClayGravel Rock Sea GrassGravel Rock Sea GrassSea OatsSea Oats

SEABED STATISTICS SEABED STATISTICS allows you to allows you to specify a range of E1 and E2 values that specify a range of E1 and E2 values that determines the bottom classifications.determines the bottom classifications.

This information is stored in a This information is stored in a *.SIX*.SIX file. file.

The surveyor needs to ‘The surveyor needs to ‘ground truthground truth’ the data by taking bottom ’ the data by taking bottom samples and logging the E1 and E2 values over each bottom type. samples and logging the E1 and E2 values over each bottom type. The raw data files can be read into The raw data files can be read into SEABED STATISTICS SEABED STATISTICS to assist to assist in the generation of the in the generation of the *.SIX *.SIX file.file.

Screen from SEABED STATISTICS

SEABED ID in SURVEYSEABED ID in SURVEY

Seabed Driver Seabed Driver Window.Window. SeabedID.DLLSeabedID.DLL

RoxannRoxann EchoplusEchoplus

Displays the real Displays the real time updates of the time updates of the E1 and E2 values.E1 and E2 values.

The matrix displayed The matrix displayed in the Area Map is in the Area Map is being painted using being painted using the the Seabed ID (Seabed ID (SIXSIX) ) colors.colors.

Seabed ID Display in HYPACKSeabed ID Display in HYPACK®

Option 1:Option 1:• Color code matrix file Color code matrix file

with Seabed ID with Seabed ID classifications.classifications.

Option 2:Option 2:• Color code soundings Color code soundings

(Edited All Format) (Edited All Format) with Seabed ID with Seabed ID classifications.classifications. All soundings over mud All soundings over mud

are red.are red. All soundings over clay All soundings over clay

are green.are green. Etc.Etc.

Seabed ID Driver in SURVEY: Seabed ID Driver in SURVEY: No Identification SquareNo Identification Square

Making a Seabed ID SquareMaking a Seabed ID SquareSEABED ID ProgramSEABED ID Program

Ground truthing.Ground truthing.• Take a bottom sample.Take a bottom sample.• Interesting?Interesting?

Yes:Yes: Log to a RAW data file Log to a RAW data file for one minute. Note the for one minute. Note the material type.material type.

Finished ground truthing:Finished ground truthing:• Load each file into Load each file into

SEABED ID and create a SEABED ID and create a polygon that surrounds polygon that surrounds each material type.each material type.

Seabed ID Driver in SURVEY with an Seabed ID Driver in SURVEY with an Identification Square (*.SIX)Identification Square (*.SIX)

SEABED MAPPER ProgramSEABED MAPPER ProgramRe-Mapping Data Already CollectedRe-Mapping Data Already Collected

Using the E1,E2 records of the input data file, it determines a new Using the E1,E2 records of the input data file, it determines a new Seabed ID classification based on the new Seabed ID Square Seabed ID classification based on the new Seabed ID Square (*.SIX(*.SIX).).

Saves updates to new data files.Saves updates to new data files.

SEABED MAPPERProgram

RAW or EDIT Data Files

Seabed IDSquare

New RAW or EDIT DataFiles with Updated ID