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

v01430086 001 v100 dcimpanorama100 0045dji groundwork burwen castle roman fort elslack skipton north yorkshire surveying photogrammetry mapping history dales archaeology ribchester york aerial drone photograph monument ancient 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 registered