Our method · Planned capture

Every survey flown to a plan.

Before we arrive, the flight is planned around your building: a fixed distance from the wall, fixed overlap between photos and a set of pre-decided capture points. That is what makes our elevations measurable, our reports complete, and next year’s survey directly comparable with this one.

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Pre-decided data capture points

Six capture point types, set before take-off

Each point has a fixed position, camera angle and overlap. The pilot flies them in order and checks coverage at hold points before leaving site, so nothing is missed and nothing depends on guesswork in the air.

CP-E · ELEVATION GRID

Every face, row by row

Horizontal rows from 2 m up to above the parapet, square to the wall, at a fixed distance all the way round.

10 m stand-off80% / 70% overlap≈1.7 mm/px
CP-C · CORNER TIE-INS

Faces joined, not guessed

A vertical column at each corner on the 45° line, so the elevations join into one continuous record of the building.

45° to cornerevery row height
CP-R · ROOF GRID

A measurable roof plan

A top-down grid flown as a mapped mission, extending past the roof edge so every outlet, upstand and gutter is in frame.

camera −90°15 m above roof80% / 70%
CP-O · OBLIQUE ORBITS

The whole building in 3D

Two circuits at different heights and camera angles, used to tie the elevations and roof into a 3D model where one is needed.

36 points per orbit−40° and −20°
CP-T · THERMAL GRID

What the surface hides

A closer, slower grid with the thermal camera for moisture and heat loss, flown only in the right conditions for a reliable reading.

8 m stand-offdry · low sunR-JPEG
CP-X · DEFECT CLOSE-UPS

Detail where it matters

Zoom or telephoto shots of every crack, joint, fixing and failed repair found during the flight, tagged to its face and floor.

7× or telesame stand-off
Why it matters

Planned capture makes a better report

Measurable

A fixed distance and a measured reference on every face mean the stitched elevations are to scale. Repair areas and lengths are measured, not estimated by eye.

Complete

The pilot checks coverage, sharpness and overlap at hold points before moving on. Gaps are re-flown on the day, not discovered in the office.

Repeatable

The same capture points can be flown again next year. You can see exactly what has changed, and prove that repairs were done.

From capture to report

Five stages, one standard

01 PLAN

Before the day

Building measured from plans or maps, airspace checked, capture points and stand-off set.

02 FLY

On site

Elevation grids, corners, roof grid, then orbits, thermal and close-ups as the job needs.

03 CHECK

Hold points

Sharpness, overlap and coverage checked before each move and before leaving site.

04 PROCESS

In the office

Photos stitched into scaled elevations and a roof plan. Every frame reviewed for defects.

05 REPORT

To you

Defects numbered, measured and graded, with a clickable web version and the full photo set.

Get in touch

Send us the address

Tell us about the building and what you need to know. We come back with a capture plan, a price and any airspace permissions needed.

Prefer to talk? Call 07931 406308or email info@901aerialsurveys.co.uk

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