MK Surveys were commissioned to carry out a terrestrial laser scanning and UAV survey in order to provide topographical survey information for the design of a new PSP (Principal Supply Point) and relocation of existing disconnectors to the east of Manchester Piccadilly Station.

We installed a robust control network on the platforms and in other off-track locations in a high street environment prior to track access being granted. Static laser scanning of the client defined area (including track, platforms and general rail infrastructure) was undertaken with a Trimble X9 laser scanner during midweek night-time possessions. GCP’s (Ground Control Points) were installed throughout the surrounding area, and the Matrice 4 Enterprise UAV flown to capture the remaining areas that could not be completed within the limited track access provided. Point cloud data was produced from the UAV photogrammetry and combined with the terrestrial scan data with additional QA procedures carried out to confirm the integrity of the merged data.

Deliverables to the client included a 3D CAD drawing was produced from the point cloud data covering the extents with the specific features requested by the client, and at the accuracy levels requested.

Challenges

Access to the east of Manchester Piccadilly Station was very limited, so we had to use survey methods that limited track access requirements but still achieved the requirements of the client specification. 

Deliverables

We provided a 3d CAD drawing with topographical detail extracted from the point cloud from the X9 scanner and UAV photogrammetry. Point cloud data was also provided in the clients requested formats.

The project showed the value of UAV technology where access to certain areas of the railway infrastructure proves difficult. Proposing the use of the UAV to complete the survey meant that the client did not require any more expensive possession access and associated safety critical costs. It also improved H&S on the project as no surveyors were required to enter the track corridor to complete the works.