METHOD STATEMENT FOR TOPOGRAPHICAL SURVEYS
Plan Control
A minimum of two survey stations are established using GPS+GLONASS from the Leica SmartNET service and marked with P-
Further site control points (stations) are established as necessary by closed loop traverse.
The maximum error between survey control stations would not exceed 1 part in 20,000 for distances exceeding 200m. For shorter distances the maximum error would not exceed ±10mm.
Level Control
Height control is established by closed double-
The height difference between any two survey stations would not be in error by greater than: ±12 x √k mm where k is the distance in kilometres between the points being considered, or ±5mm, whichever is the greater.
Detail Observations
All survey observations are to be made with a Leica 1205 Reflectorless Total Station, Leica Viva GNSS GS08 NetRover or other instruments available to Lincolnshire Surveys that have a current calibration certificate issued by an authorised Leica service engineer.
Details recorded generally include:
Building outlines at ground level with ridge and eaves levels noted if required.
Boundary features with type and levels of top noted.
Hard detail including roads, kerbs, edgings, channels, tracks, walls, steps, and changes in surface materials etc. suitably annotated.
Service covers, gullies and the like correctly sized and orientated with cover levels. Invert level may be recorded if required.
Street furniture including, lamp standards, telecom & other poles, traffic lights, post boxes, telephone boxes and road signs etc.
Overhead detail including service cables
Trees greater than 0.2m at 1.50m above GL with trunk diameter and average spread and height noted. True canopy lines are recorded if required.
Hedges and outlines of significant shrubs with height annotation.
Tops and bottoms of banks.
Invert of open ditches/watercourses.
Spot heights on nominal grid as appropriate to the site or client requirements and at any significant changes in level.
Contours at 0.25m vertical interval or less if required.
Detail is recorded to the accuracy dependent on the survey scale required.
1:2500 +/-
1:1250 +/-
1:500 +/-
1:200 +/-
1:100 +/-
1:50 +/-
Downloading and Processing
Data is downloaded into Applications in CADD n4ce Professional software for processing.
Drawings are delivered by email in PDF and AutoCAD DXF or DWG format.
Paper or film copies would be produced on request.
METHOD STATEMENT FOR MEASURED BUILDING SURVEYS
We use a variety of surveying techniques depending on circumstances and project requirements such as:
Accessibility
Health and Safety
Project schedules
Level of detail
Level of accuracy
Scale and size of the deliverable
Detail is recorded to the accuracy dependent on the survey scale required.
1:200 +/-
1:100 +/-
1:50 +/-
If a topographical is carried out prior or at the same time we will generally relate the survey datum to that of the topographical survey.
For larger buildings with large open spaces we generally use a Total Station for the main elements of structure both externally and internally.
Detailed elements are recorded with Disto Laser and steel tape.
Details recorded generally include:
External walls.
Internal walls with differentiation of masonry and stud construction.
Window and door locations with cill and head heights.
Staircases, ramps and steps and balustrades.
Exposed beams
Sanitaryware
Locations of incoming services and meters.
Annotation of internal and external materials.
Please discuss your specific requirements at the time of your enquiry.