The importance of light

The video below demonstrates the importance of light for identifying potential archaeological features. Flat light or overcast conditions, which limit shadows, make it extremely difficult to differentiate the small topographical changes that may be indicative of archaeological features.

In the video below a drone / UAV survey was undertaken to create a detailed 3D model or Digital Surface Model (DSM). The DSM, as a software construct of the 3D surface of the ground, can have its texture changed and can be lit from any angle providing the shadows that may otherwise be lacking.

3D Model of Poor Man’s Well

Impact GIS recently undertook a photogrammetric survey, on behalf of Moore Group, of an historic well exposed during road realignment and upgrade works in Dublin. Located to the north of Phoenix Park, along Blackhorse Avenue, the Well is noted as ‘Poor Man’s Well’ on both the 6 Inch (circa 1830) and 25 Inch (circa 1900) historic Ordnance Survey maps. The following 3D model was created from a measured, photographic survey and used to produce a series of figures for inclusion in the excavation report for the project.

Poor Man's Well   Poor Man's Well 2