LinkedIn Micro-Series: Field Book (Week 1 of 26)

This is the live, updated entry for the LinkedIn micro-series. New posts added every Thursday.

Week 1 — What I see when I survey a site

When I arrive at a topographical survey site, the first thing I do is stand still and look. Not measure, not photograph — just look.

I look for:

• The shape of the land — the natural fall of the ground, the obvious high and low points
• The boundaries — fences, hedges, walls, the obvious limits of the property
• The vegetation — mature trees and woodland areas that often mark old boundaries
• The infrastructure — roads, buildings, services, drainage
• The unexpected — the things the client didn't mention, the things the OS map didn't show

I look for 10 minutes before I measure anything. The 10 minutes of looking saves hours of measuring the wrong things.

That's the work. That's the series. Every Thursday I'll post a 300-word note from the field.

— Bhavesh Ramburn, MRICS, founder of Icelabz

Week 2 — The £3,000 topo that saved a £150,000 mistake

Last week a client called: "We've just bought a 2-hectare site for a housing development. The seller gave us a 'topo' from 2018. Can you verify it?"

I downloaded the 2018 topo. The spot heights were 2-5 years old. Two earthworks contractors had operated on the site in the interim. The ground levels had changed by 0.3-1.2 metres in places.

If the client had used the 2018 topo, the cut-and-fill calculations would have been wrong by hundreds of cubic metres. Earthworks cost: £150,000-£200,000 over budget.

The £3,000 fresh topo caught it. The client instructed a new cut-and-fill design based on current levels. Project delivered on budget.

The lesson: never use a topo more than 6 months old for design work. Site conditions change.

Week 3 — Why I prefer GNSS RTK over total station (and vice versa)

I run both.¹ The GNSS RTK is fast, light, and one-person operation. The total station is heavier, two-person operation, but sub-millimetre accuracy.

For a typical 1-hectare rural site, the GNSS wins: faster setup, faster measurement, easier to cover large areas.

For a tight urban site with kerb lines, drainage inverts, and 5cm accuracy required, the total station wins: no satellite signal issues, no multipath errors, no need for clear sky view.

The right tool depends on the site. I run both because I don't always know in advance which site I'll get.

Next post: Week 4 — How I plan a drone flight (the 30 minutes that save hours).

References

How to commission

Book a 15-minute clarity call with an Icelabz topographical surveyor. We'll review your situation and give you a fixed fee in 24 hours. Or read the complete topographical survey guide and see the topographical survey service page for the full service description.

I use the GNSS RTK primarily because it's faster and one-person. The total station is reserved for high-accuracy corners (typically 0.5-1% of the total points), tight urban sites, and verification shots during QA.

The two tools complement each other. GNSS for coverage, total station for precision corners. I have both in my vehicle and I switch between them based on the day's requirements. A 1-hectare site might need 200 GNSS points for the bulk survey plus 8-10 total station points for the critical corners.