aerial photograph over burwen castle roman fort which is a registered ancient monument at elslack, skipton, north yorkshire

v01430086 001 v100 dcimpanorama100 0045dji aerial photograph burwen castle roman fort registered ancient monument elslack skipton north yorkshire groundwork surveying photogrammetry mapping history dales archaeology ribchester york drone army enclosure rampart defence grass turf railway thornton beck excavation stream foundations stone historic heritage olenacum prima herculean constantine antiquities archaeological reconnaissance earthwork cropmark soilmark