teamsurv presentation at southampon boat show, 2011

• Modern surveying is accurate to a few centimetres

• Modern surveying is accurate to a few centimetres • It is expensive ~ £4000/square nautical mile for a multi-beam survey

• Modern surveying is accurate to a few centimetres • It is expensive ~ £4000/square nautical mile for a multi-beam survey • Hydrographic Offices don’t have the resources to keep up to date

• Until 30 years ago positioning was by horizontal sextant angles

• Until 30 years ago positioning was by sextant • Until 50 years ago depth was by lead line

• Until 30 years ago positioning was by sextant • Until 50 years ago depth was by lead line • Many charts still use this old data

• Until 30 years ago positioning was by sextant • Until 50 years ago depth was by lead line • Many charts still use data over 100 years old • The UKHO reports that only 49% of coastal waters are adequately surveyed

• Many boats logging data as they go about their normal business

• Many boats logging data as they go about their normal business • Build up good coverage with time

• Many boats logging data as they go about their normal business • Build up good coverage with time • Use standard instruments – GPS, depth sounder, compass

0 10 20 30 40 50 60

-0,7

-0

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0,3

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% fr

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Depth delta, m

• Many boats logging data as they go about their normal business • Build up good coverage with time • Use standard instruments – GPS, depth sounder, compass • Accuracy and coverage good enough for most purposes up to ~ 100m depth, and better than old surveys

0 10 20 30 40 50 60

-0,7

-0

,5

-0,3

-0

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0,1

0,3

0,5

0,7

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1,3

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% fr

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Depth delta, m

• Many boats logging data as they go about their normal business • Build up good coverage with time • Use standard instruments – GPS, depth sounder, compass • Accuracy and coverage good enough for most purposes up to ~ 100m depth, and better than old surveys • The more data, the more accurate the results

How to become a logger • All are welcome to become data loggers • Register online at www.teamsurv.eu • To become a logger, go to Join In|Apply • You get kitted out with the logging tools • Log data whenever you are on the water • Upload data to the web site

On Board •Calibration •Data Logging

Track Ingest •Upload to web •Remove bad data •Ingest data

Corrections •Geometry •Speed of sound •Sea level •(Vessel motions)

Synthesis •Combine data •Remove outliers

Chart Creation •Geostatistics •Gridding •Surface generation

Error analysis

Data display

• Uses your standard GPS and depth sounder • Requires NMEA0183 or Raymarine Seatalk output • Doesn’t interfere with your existing setup • Easy installation

Hardware logger – 2 channels NMEA or Seatalk to USB - supplied on free loan

Software logger for Windows - works in parallel with PC navigation software - free download

Works directly with increasing number of manufacturer’s products:






Error analysis

Data display

• Data uploaded to the internet after your sailing • Just take the USB stick ashore from the hardware logger • Upload via the TeamSurv web site • or using the SmartLog software • Data is checked on upload, bad data filtered out, and errors reported

Show all tracks Highlight your own tracks

Show raw logged depths (Shows lowest logged depth where there are multiple data points)






Error analysis

Data display

Two levels of corrections Primary: Tide height predictions calculated and interpolated Secondary: Residuals calculated as difference between tide gauges and predictions, and then interpolated

Tide prediction

Tide gauge

• The speed of sound affects the depth shown on your depth sounder • It varies with temperature, salinity and depth of water • e.g. 5% difference between English Channel in summer and Baltic in winter • Salinity and temperature obtained from various sources • Data interpolated and applied

Shows depths along tracks with all corrections applied






Error analysis

Data display

Tracks from all vessels are combined, creating greater accuracy

A grid is generated, with grid spacing varying with data quantity and quality. Rogue data is filtered out Higher accuracy depths are calculated from the data The grid is interpolated to generate contours

Multibeam TeamSurv

Comparison against multi-beam survey for validation: Mean depth difference: 0.08m Standard deviation: 0.21m

We are just starting chart creation Limited to areas where we have sufficient data Gridded data is used to create a chart. Chart just shows bathymetry (depth) data Lat/long grid and coastline shown for guidance on paper version Available as a PDF to print off, or in a number of digital formats

Available now: • PDF to print off and take with you • Shape file for viewing in GIS applications • x, y, z data for further processing Under development • KML files for Google Earth • BSB raster format charts • seaPro GXF format • Garmin raster and vector charts • Lowrance charts • Navico charts Other formats will be supported based upon user demand and availability of file formats

Smartcom Software – Project Coordinator MPG Software – Software development

Amber Route – French and Lithuanian trials

www.teamsurv.eu

The research leading to these results has received funding from the European Community's Seventh Framework Programme under grant agreement n° 247998.

http://www.teamsurv.com/

teamsurv presentation at southampon boat show, 2011

Science