PLA Live Tides on Geodesea Website

The freely available Thames Live Tide data (provided by Port of London Authority) is now also shown HERE

For more information, see the  PLA Hydrographic Website

CSO Hi-Res surveys for Thames Water

Geodesea Ltd were recently asked to process and render hi-resolution multibeam bathymetry data of several Combined Storm Outlet structures located within the River Thames for Thames Water PLC.

Comparison of several datasets over the same structures allows for utilities providers to get a clear picture of the sedimentation regimes within the structures on a temporal, as well as spatial, basis.

Volumetric analysis was carried out using Hypack and Fledermaus software packages.

Thames Tideway Tunnel Construction Video

Interesting animation on the planned construction of the Thames Tideway Tunnel

https://vimeo.com/93163541

Early start in London this morning....

Updated Thames Tideway Tunnel Project Grid Conversion v1.01

v1.01 - a  recent application update in support of ongoing hydro consultancy works for the Tideway Tunnel Bathy Monitoring programme. 

Geodesea Ltd provide hydrographic consultancy services for Landscope Engineering in support of Environment Agency bathy survey of the Upper Thames

Geodesea Ltd recently provided hydrographic consultancy services to Landscope Engineering in support of an EA multibeam survey contract. The survey was 38km stretch of the Upper Thames between Osney & Rushey in the Oxford area.
The survey vessel used was the Landscope owned & operated SV Polecat equipped with R2Sonic 2024 & Applanix POSMV.
Geodesea Ltd provided assistance in the mobilisation & calibration of online systems, provision of an online hydrographic surveyor and data processor plus training to Landscope engineers in the use of Hypack/Hysweep for data processing.

Surveyors: JP Cheminade & Joanna Andrzejewska

RS232 to USB latency minimisation

Having to mobilise equipment in a short  time , with limited equipment & space it is sometimes necessary to use Rs232 to USB serial converters. But the inherent latency is not ideal for a survey setup.

When data is sent from a serial device to a USB converter it is cached on the USB converter until one of two things happens:

• Transfer size – More then x BYTES are collected or
• Latency timer – More then n Milliseconds (ms) expirer.

Luckily we can set the Transfer size, and latency timer.

Most USB to 485 devices that I have used have the ability to set the transfer size and the latency timer.

1. Start menu–> Settings –> Control panel –> device manager –> Ports (COM & LPT) –>{Select your USB to RS485 converter}
2. Right click and select “Properties”
3. Select the “Port Settings” tab
4. Click the “Advanced” button 
5. Change the Latency Timer (mSec) to 1ms or the lowest possible setting (I use 4ms).
6. Change the USB Transfer sizes to 256 - the largest NMEA data string is 82 bytes. 
7. Save and close.

Geodesea Ltd Continue to Provide Hydrographic Personnel for the Tideway Tunnel Bathymetric Monitoring Programme

Geodesea Ltd are continuing provision of IHO CatA Hydrographic Surveyors to the Port of London Authority in support of the ongoing Thames Tideway Tunnel Bathymetric Monitoring Programme. We are now in the 5th round of surveys (site specific areas), and due to kick off the 3rd full river survey at the beginning of April 2015.

A good end to the start of another contract on the River Thames