Geophysical Magnetic Anomaly Map
The University of Glasgow team have produced a magnetic anomaly map from the data collected in the survey, shown below superimposed over the aerial photograph. The linear feature shown on Scobie’s 1783 map is visible both in the magnetic anomaly and the aerial photograph, as is the rectangular earthwork. Over to the west is an area of significant disturbance in the magnetic anomaly, corresponding to an area of what have been described as cists.
LIDAR or Light Detection and Ranging is a surveying method that measures distance to a target by illuminating the target with laser light and measuring the reflected light with a sensor. Differences in laser return times and wavelengths can then be used to make digital 3-D representations of the target (Wikipedia). The Vale of Fortingall was included in LIDAR surveys as part of a flood risk mapping programme. The images below produced from LIDAR files in the Scottish Remote Sensing Portal show the topography of the Dalreoch field, the main features seen on the aerial photographs and some small features in the cist area that have an unusual magnetic anomaly.
LIDAR map of Dalreoch field with colour representation of height with the main features identified
More detailed LIDAR view of the area of unusual magnetic anomaly
Peter HeyesShow the Map