Lonestar survey division dedicated to the provision of comprehensive and cost-effective topographical and underground utility survey solutions to the customers. We provide professional land surveying services by combining years of experience and up to date surveying equipment to ensure consistent, accurate and timely survey data and mapping.Our suitably experienced and talented survey team provides precise and comprehensive surveying by using conventional and cutting -edge survey equipment.
Our services include following: -
Topographical survey (contour surveys):
A topographic survey locates all surface features of a property, and depicts all-natural features and elevations. In essence it is a 3-dimensional map of a 3-dimensional property showing all natural and man-made features and improvements. Specifically, it shows their location, size, height and any changes in elevation.
Topographic surveys may be required as part of land development, civil engineering design and construction projects, including:
- Remodeling projects to existing structures
- Utility design
- Road or bridge design or improvements
- Grading or drainage projects
Together with a boundary survey, topographic surveys are used by architects and engineers to create accurate and appropriate designs based on existing conditions. Measurements for topographic surveys are done either with a surveying-quality GPS unit, or with an Electronic Distance Measurement unit. The results of the topographic survey are presented as contour lines on a site map, and can be enhanced by computer software to provide interactive views. Our Computer Aided Design Specialists can generate drawings, maps based on input from field observation or data.
Engaging a professional surveyor to conduct a topographic survey prior to land development or the commencement or a construction project will ensure that the land’s features will be suitable for its intended use. In addition, a topographic survey can provide valuable insight in to how a site’s previous or current use how affected the land, enabling better planning for future.
Underground utility survey
It is Important to collect all information regarding existing underground utilities within the surveyed areas, accurately locate all existing underground utilities by whatever means appropriate for the same and show all the existing above ground and underground utilities on the survey drawings.
As the Infrastructure continues to grow due to new developments and the need to replace / maintain our existing utilities increases, It is very essential to keep an accurate information. It is always been a difficult task due to the lack of information which may cause
- Risk to Safety of Workers and to the Public
- Damage of third-party assets.
- Inefficient design solutions.
- Abortive and unnecessary works.
In-order to avoid the above Situations Standard Methods for Detection, Verification and Locating of Underground Utilities are very much important. All the Verified and Collected data has to be recorded for future use.
Following types of survey technique’s
- Desktop Utility Record Search.
- Site reconnaissance method
- Detection Methods
- Verification Method
Electromagnetic locator and Ground penetrating radar (GPR) can be used to detect existing utilities, services, cables, pipes and other buried features and obstructions. Physical excavation (Trial Pits / Slit Trench Excavation) shall be carried out to verify the routes and define elevations of buried cables and pipes.The successful identification of Existing Utilities can be getting by using proper utilities drawings / network diagram, by means of manual excavation.
Radio Detector RD8000 PDL, GPR RD 1000 was used to detect existing underground services and utilities. Underground utility mapping uses the principles of geophysics to detect, locate, identify and investigate buried services. This solution is based on the techniques of Radio-Detection (electromagnetic). The depth of investigation depends on the conditions of the site. In general Radio-Detection technique detects services up to 3.0m below the ground surface. The depth of penetration of radar can be increased but often at the expense of resolution.
As GPR uses a higher range of frequencies (example 400 MHz to 2000 MHz) compared to Radio Detection methods (example 10’s Hz to > 600 kHz, model specific) these GPR frequencies are more susceptible to signal attenuation. Note also that GPR cannot distinguish the type of utility, only its presence by either returned signal or inference due to disturbed ground interpreted as utility trench.
Terrestrial LiDAR & Mobile LiDAR
Terrestrial laser scanning (TLS), also referred to as terrestrial LiDAR (light detection and ranging) or topographic LiDAR, acquires XYZ coordinates of numerous points on land by emitting laser pulses toward these points and measuring the distance from the device to the target.
sub-bottom profiler is a type of sonar system – a geophysical survey tool that uses sound to map beneath the seafloor. Low-frequency pulses of sound are aimed toward the seafloor, where some pulses penetrate through and are then reflected by subsurface sediment.
SUB- BOTTOM PROFILING:
sub-bottom profiler is a type of sonar system – a geophysical survey tool that uses sound to map beneath the seafloor. Low-frequency pulses of sound are aimed toward the seafloor, where some pulses penetrate through and are then reflected by subsurface sediment