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LINCOLNSHIRE SURVEYS

LAND & MEASURED BUILDING SURVEYORS

Telephone: 01 673 838 464      •     07 940 030 635      •     email: john.rowan@lincs-surveys.co.uk      •     More information? - Contact us using the form provided      •     Topographical Surveys      •     Boundary Surveys      •     Level Surveys      •     Measured Building Surveys      •     Greenfield site      •     Brownfield Sites      •     Commercial      •     Residential      •     Domestic      •      Telephone: 01 673 838 464      •     07 940 030 635      •     email: john.rowan@lincs-surveys.co.uk      •     Contact us using the form provided      •     Topographical Surveys      •     Boundary Surveys      •     Level Surveys      •     Measured Building Surveys      •     Greenfield Sites      •     Brownfield Sites      •     Commercial      •     Residential      •     Domestic      •      Telephone: 01 673 838 464      •     07 940 030 635      •     email: john.rowan@lincs-surveys.co.uk      •     Contact us using the form provided      •     Topographical Surveys      •     Boundary Surveys      •     Level Surveys      •     Measured Building Surveys      •      Telephone: 01 673 838 464      •     07 940 030 635      •     email: john.rowan@lincs-surveys.co.uk      •     Contact us using the form provided      •     Topographical Surveys      •     Boundary Surveys      •     Level Surveys      •     Measured Building Surveys      •      Telephone: 01 673 838 464      •     07 940 030 635      •     email: john.rowan@lincs-surveys.co.uk      •     Contact us using the form provided      •     Topographical Surveys      •     Boundary Surveys      •     Level Surveys      •     Measured Building Surveys      •     Greenfield Sites      •     Brownfield Sites      •     Commercial      •     Residential      •     Domestic
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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-K or other suitable nails in hard surfaces. Multiple observations are taken with a minimum of 45 minutes between observations.

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-run levelling using either a convenient OS bench mark, precise levelling point or the value of one of the survey stations observed with static GPS.

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 +/- 2.4m  

1:1250 +/- 1.0m  

1:500 +/- 150mm  

1:200 +/- 60mm  

1:100 +/- 30mm  

1:50 +/- 15mm  


Downloading and Processing


Data is downloaded into Applications in CADD n4ce survey 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 +/- 60mm  

1:100 +/- 30mm  

1:50 +/- 15mm


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.