info@lasersurveys.com
- Land & Building Surveys:
- Topographical Surveys
- Measured Building Surveys
- GPS Surveys
- Underground Services Surveys:
- Drainage Connectivity Surveys
- CCTV Drainage Integrity Surveys
- Underground Services Surveys
- Ground Penetrating Radar
- Rebar Location and Mapping
- Utility Stats Searches
- Centremapslive.com:
GPS Surveys
Global Positioning System or GPS enables the positioning of any point in a global framework through observations to a network of satellites. Originally designed for military use by the US, the information from these satellites was made publicly available in the 1990's. The use of Leica RTK GPS Systems and Leica SmartNet increases our efficiency on the larger surveys but also reduces the costs on other survey services including -
- Photo-control
- Highways - Primary Control
- Asset Surveys
- Boreholes/Trial Pit Locations
- Larger Earthworks/Land Fill/Green Field Level Surveys
- Archeological
- Setting out
- Coordinated Verified Photographs for Planning
The high level of accuracy and speed of use of the GPS Total Station allows "real-time" surveying. When the system is mounted on one of our 4WD All Terrain Vehicles our production levels are greatly increased.
OSBM values are no longer shown on Ordnance Survey Mapping but we do offer a complete and FREE national benchmark finder and listing on our mapping data delivery site www.centremapslive.com.
If you would like more information about benchmarks from Centremapslive.com contact us on 01886 832972 or email info@centremapslive.com
Leica SmartNet - A partnership between Leica Geosystems and Ordnance Survey
Traditionally, high precision GPS solutions are provided using two GPS receivers; a reference and a rover. This requires a lengthy point occupation (typically 5-8 hours) and post-processing in the office to obtain accuracies around the centimetre level. With the use of just a rover, the obtainable accuracy is only around 10 metres.
Leica SmartNet was launched in December 2005. It uses just one receiver but communicates via mobile telephone with the SmartNet RTK Network to receive corrections to observations. This enables a solution of position virtually instantaneously. It means that survey work can be carried out at full precision, in OS National Grid in real time. The network is supported 24 hours a day, 7 days a week and extends the full length of the country.
Leica SmartNet is based on raw data from the Ordnance Survey network of GPS base stations. This network, known as OS Net, comprises around 90 permanent nationally deployed GPS reference stations. Data from each of these base stations around the country is received over the Internet at a highly secure location in London's Docklands where it is processed and made available for download.
Since the early 1990's The Ordnance Survey have not been supporting either their Bench Marks or Trig Pillars. They have now been replaced by the National GPS Network as the definitive realisation of the Ordnance Survey mapping co-ordinate systems.