Project highlights
Surveying requirements can change considerably from one project to another. A topographic survey may need to document the existing elevations and physical features of a developed site before design work begins. On another project, an as-built survey may be needed after construction to record what was actually built and provide dependable information for engineering review.
Recent fieldwork by Geo Vision Surveying Inc gives good examples of both: topographic surveying in Cambridge, Ontario, and as-built surveying on a bridge construction project in Brantford. Although the sites and objectives were different, each project depended on accurate field measurements and reliable survey information.
Topographic surveying in Cambridge, Ontario
A topographic survey provides a detailed picture of the existing physical conditions of a site.
For our recent Cambridge project, the fieldwork involved collecting elevations and visible site features that could be used to accurately represent the existing conditions. This type of information is often important before engineers, designers or contractors begin making decisions about proposed work.
Depending on the project requirements, topographic survey information may include:
- existing ground elevations
- changes in slope
- buildings and other structures
- walkways and hard surfaces
- landscaping and vegetation
- drainage-related features
- other visible site conditions relevant to the proposed design
Why existing conditions matter
Design decisions should be based on what actually exists on the ground. Even relatively small elevation differences can influence grading, drainage and how proposed construction connects with existing surfaces.
This is why careful field collection is important. The objective is not simply to collect a large number of points. The surveyor must identify which features are relevant and collect enough information to create a useful representation of the site.
For the Cambridge topographic survey, our field approach focused on documenting those existing conditions accurately and efficiently.
The field decisions behind a topographic survey
The instrument is only part of the process. Successful topographic fieldwork also requires decisions about:
- where the instrument should be positioned
- how reliable survey control will be maintained
- which features need to be observed
- how obstacles or restricted visibility will be handled
- whether the collected information adequately represents the site
These decisions matter because the quality of the final survey information depends heavily on the quality and completeness of the field observations.
From field measurements to useful site information
A completed topographic plan may look straightforward, but behind it can be hundreds or thousands of individual observations. Each measurement represents part of the physical site.
Combined, these observations help engineers and designers understand existing elevations, slopes, structures and other relevant features before developing their plans. Accurate topographic information gives a stronger basis for engineering, grading and construction planning.
More from CambridgeTopographic survey in Cambridge
As-built surveying on a Brantford bridge project
The Brantford assignment involved a different stage of the construction process.
Instead of documenting conditions before design, our work involved as-built surveying on a bridge project after portions of the structure had been built.
Construction drawings show what is intended to be built. An as-built survey records the position and elevation of what was actually built in the field.
Using Trimble surveying technology, Geo Vision Surveying Inc collected observations on the bridge structure to document completed construction and provide information that could be compared with the project design.
Project write-upBridge construction layout and as-built checks in Brantford
Why are as-built surveys important?
Construction projects develop in stages. Before the next stage proceeds, engineers and contractors may need confirmation that critical elements have been built at the expected position or elevation. As-built surveying can help provide that information.
Depending on the requirements of a project, as-built surveys can support:
- verification of constructed locations
- elevation checks
- engineering review
- construction quality control
- project documentation
- record drawings
- coordination before later stages of construction
On infrastructure projects such as bridges, this verification can be particularly important, because later construction may depend directly on components already completed.
Plans show the design. As-builts record the result.
There is an important distinction between construction layout and as-built surveying. Both play important roles at different stages of a construction project.
Construction layout
Design information is transferred from the drawings to physical points in the field. Construction layout helps show where something should be built.
As-built survey
Measurements are taken from completed construction to record where elements were actually built. As-built surveying helps document where it was built.
Different projects require different surveying methods
The Cambridge and Brantford projects show the range of field conditions surveyors regularly encounter:
- Cambridge: the objective was documenting existing conditions for a topographic survey.
- Brantford: Trimble surveying equipment was used for as-built observations on an active bridge construction project.
No single instrument or field method is right for every situation. The surveyor must consider the site conditions, required accuracy, project objectives and the information the client needs before deciding how the work should be completed.
The value of reliable survey information
Survey information often becomes the foundation for decisions made by other professionals:
- Engineers may use topographic information during design.
- Contractors may rely on construction layout when positioning proposed work.
- Project teams may use as-built information to verify completed construction.
Because other decisions depend on these measurements, field procedures, survey control and careful checking remain important throughout the process. The objective of Geo Vision Surveying Inc is to provide information that clients can confidently use as their projects progress from existing conditions through design and construction.
Surveying services across Southern Ontario
Geo Vision Surveying Inc provides surveying support for engineering, construction and development projects throughout Southern Ontario. Our services include:
- Topographic surveying
- Construction surveying and layout
- Building layout
- Grading surveys
- As-built surveying
- Monitoring surveys
- Drone surveying
- LiDAR scanning
- Specialized geomatics services
Our field equipment includes Trimble and Spectra surveying technology, selected according to the requirements of each project.
We regularly support projects in communities including Brantford, Hamilton, Cambridge, Simcoe, Guelph, Kitchener-Waterloo and surrounding areas.
See all our surveying projectsPlanning a project in Brantford or Cambridge?
Getting the surveyor involved early can help clarify the required field information, project control, deliverables and timing before construction or design progresses.
Whether your project needs an existing-conditions topographic survey, construction layout or as-built verification, Geo Vision Surveying Inc can help determine the right surveying approach. Send us the address, your drawings and your schedule, and we will reply with a quote.