OS GNSS & GPS Survey
GPS (Global Positioning Systems) or GNSS (Global Navigational Surveying Systems) Surveying is the most advanced positioning and data recording technology available to the Land Surveyor in today’s world. Using available Satellites from the US, Russia, Europe and China (generally a minimum of 5 satellites are required at any one time, for position initialisation), the Receivers record satellite signals and with internal receiver software, sub-centimetre accurate horizontal and vertical positioning data can be provided about any point or feature. This data can be related either to the OS National Grid Coordinate system or to your project’s own Local Grid. The recorded data can be processed and manipulated by various software applications, depending on client requirements.
The processed data is then available to the Project Team in various forms to ensure everyone has the highest quality information to hand. This is a system set up and controlled by the U.S. Military. They have at the time of writing, in combination the set up is around 30 satellites in orbit around the earth. These satellites send signals to earth, GPS receivers on the ground pick up these signals. The receivers use the signals from a number of satellites to calculate their own position on the earth’s grid reference system with a sub millimetre accuracy, depending on the equipment used.
We have found that GPS surveying technology is versatile and adaptable and could be utilised in most civil engineering and construction projects. It is user friendly and can link up with various software applications to give the professional surveyor an accurate and all-round surveying tool. Surveyors can work independently from other surveyors on site, allowing greater productivity. However redundancy is required to ensure a robust output is acceptable to the deliverables. This may involve multiple readings over a span of time or be proven with conventual means.
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The processed data is then available to the Project Team in various forms to ensure everyone has the highest quality information to hand. This is a system set up and controlled by the U.S. Military. They have at the time of writing, in combination the set up is around 30 satellites in orbit around the earth. These satellites send signals to earth, GPS receivers on the ground pick up these signals. The receivers use the signals from a number of satellites to calculate their own position on the earth’s grid reference system with a sub millimetre accuracy, depending on the equipment used.
We have found that GPS surveying technology is versatile and adaptable and could be utilised in most civil engineering and construction projects. It is user friendly and can link up with various software applications to give the professional surveyor an accurate and all-round surveying tool. Surveyors can work independently from other surveyors on site, allowing greater productivity. However redundancy is required to ensure a robust output is acceptable to the deliverables. This may involve multiple readings over a span of time or be proven with conventual means.
Other Products and Services from CD Surveys Ltd
Long & Cross Sections
Provision of long and cross sections from, for instance ditch or river surveys can be provided preferably from a digital terrain model (DTM) of the site. This information could then be used for calculations of flows and volumes in a hydraulic model.
Street Scene Elevations
These street scene surveys are required to assess the visual impact of a development or a change within the ‘Street Scene’. Generally these are on at least one or two properties either side of the proposed development.
Provision of any of the above information can be issued in 3 dimensions for input into a BIM system for total management of a building or construction project.
Provision of any of the above information can be issued in 3 dimensions for input into a BIM system for total management of a building or construction project.
Building Cross Sections
Once the ‘building’ survey has been completed with elevations and floor plans the ‘section’ lines are selected (if not established from the client, Architect or Engineer) and a ‘Cross Section’ is formed from this information. However now that we are ‘Laser Scanning’ more and more buildings and sites the supply of cross sections are more concise.
Provision of the above information can be issued in 3 dimensions for input into a BIM system for total management of a building or construction project.
Provision of the above information can be issued in 3 dimensions for input into a BIM system for total management of a building or construction project.
CD Surveys Ltd
Pentire Stable, Fordbridge Road, Sunbury On Thames, Middlesex, TW16 6AX, United Kingdom
CD Surveys Ltd are a Middlesex-based surveying and engineering company specialising in architectural solutions for interior and exterior structures. Specialising primarily in land surveying, site engineering, measured building surveying and 3D laser scanning, our company has an impressive wealth of experience in professional surveying and consultancy for commercial and industrial projects. We are a very customer-focused company providing professionalism and efficiency across all applications, working closely with all clients to ensure that they receive excellent service.