The project was a Creative Economy Knowledge Exchange partnership between Charlotte Crofts (University of the West of England, Bristol), Jo Reid (Calvium / AppFurnace) and Peter Insole (Bristol City Council / Know Your Place) to develop a platform called City Strata which we prototyped through the Cinemapping Layer. The subject of the research was to test the technical, creative and aesthetic challenges of drawing data from a GIS database to a mobile app so that historic data could be accessed in the field, aiming to build a platform that could be used to develop any cultural heritage layer. We tested this through the Cinemapping prototype which draws from a separate historic cinemas layer from within the Know Your Place map, BCC’s GIS database of the historic environment record.