Described by Wikipedia as the discipline of gathering, storing, processing, and delivering geographic information, or spatially referenced information. In other words, it “consists of products, services and tools involved in the collection, integration and management of geographic data.” Historically, this would involve Land Surveyors to map the topography, then Measured Building Surveyors to create floorplans and elevations, Hydrographic surveyors to get any sea based measurements and the list goes on. So, if you stand back and say that it is all measurement, classing ourselves as Geomatic surveyors implies the skills we have in measurement, positioning, mapping are generic and applicable to buildings, land and sea. There is still nice knowledge and expertise involved to work effectively in varying contexts, but it avoids a large element of pigeonholing! Geomatics has been our specialism since the company started in 1983. The technology has changed, but the core ethos of Quality Data, measured safely and delivered professionally on time still remains. Where we started with hand booking of measurements at a rate of 300 points per day, we now gather the same 3D measured at a pace of 1,000,000 points per second for laserscanning or mapping at road speeds with our Mobile Survey Mapper. We tend to avoid the ‘black box approach’ and insist that all our surveyors are trained to know what data they are gathering, for what purpose and understand where potential errors can come from. Our quality and safety systems have developed over years to attain reliable and accurate data from our surveys.
We work to either a local grid, or link to O.S National grid as required. We understand the intricacies of grid transformations, OSGB36, ETRS89, WGS84, scale factors, grids, datums and the implications of utilising Ordnance Survey digital data. A robust survey drawing is always created from a solid network of survey control stations. This survey control must be stable and well constructed; preferably in a location that will not be moved or lost. The control observations must be taken with care, utilising calibrated instrumentation and computed with regard to redundant observations and inbuilt checks. Once computed and checked, we can document our control for future us with witness diagrams. Our range of GPS equipment and processing software allows us to provide fixed control solutions over large areas and easily tie into previous survey control placed by others.
Worldwide Geodetic Control
We also have the capability to work worldwide on geodetic networks and perform RTK mapping of large areas. For long thin surveys (pipelines, highways and railway projects), we can commission a snakegrid which gives an engineering accuracy scale factor of 1 along the centreline of the survey. Perfect for railway and pipeline surveys over tens of kilometers. Our ability to appreciate the ‘bigger picture’ has resulted in Severn Partnership being responsible for defining control survey grids that run the length of the country (East Coast Main Line grid ECM05). Sometimes a small scale approach does not work on large projects. Scale factor distortion from standard grid projections would be outside the high accuracies demanded for rail track alignment design over long distances. We can offer bespoke ‘long thin’ grid & datum projection solutions that can be created for specific projects; be they roads, railways or pipelines. The effects of scale in plan and height are taken into account to define trend lines for the ‘snakemaker’ projection. We are then able to observe with static GPS in ETRS89 coordinates and convert them into a local grid using the ‘snakemaker’ program. This technique can be used for any near-linear projects, anywhere in the world. The net result is survey work carried out without discontinuities between individual different projections.
GPS = Global Positioning System (U.S owned and administeres) GNSS = Global Navigation Satellite Systems (Generic term for geospatial positioning on a global scale) RTK = Real time kinematic OSGB36 = Ordnance Survey Natoinal Grid reference system ETRS89 = European Terrestrial Reference System WGS84 = World Geodetic System (used by GPS / GNSS)
If Geomatics covers a range of services, what will your data look like ?
Surveyed, measured, dimensioned, height, depths, volumes, alignments, models, visualisations, wireframes, coordinated, sectioned, profiled, collated, databases, spreadsheets, parametric data, attributes, coordinates – this is what we do! We can output data in a range of forms to suit any requirements, using a wide scope of bespoke software from AutoCAD to Rhino and Revit.
Some of our deliverables are listed below:
- Plans, Sections, Elevations, Contours, Isopachytes & 3D wireframes
- AutoCAD DXF, DWG or Microstation DGN
- Ascii Coordinate XYX, CSV, ASC, TXT, DOT, TTM
- GNSS / GPS Rinex data
- Registered point clouds (3D laser scan data), Pointools POD, Cyclone IMP, PTS, PTX, PTZ, LAS, PCG
- Applications in CADD n4ce data files
- Rail clearance ‘clearoute’ SCO files for train kinematic envelopes
- Terrain models & DTMs
- Volume reports from surface to surface or datum projection
- 3D Models, 3DM, 3DS, SKP, OBJ, STL, DWG, DXF, FBX, SHP
- Visualisations, Videos, Animations, Digital Terrain Models (DTMs), Interactive/Kinetic Models, 3D PDFs.
- Building Information Model (BIM) Revit RVT, IFC
- Polygonal Modelling, NURBS, Primatives, Solids, & Surface Meshing
- Survey reports & checks on other surveyors work