The chart folio is contained in a single folder, with the folder named according to the geographic area covered (since this is the name offered to the user)

The folder must contain a shapefile named rasterExtents_ARCS_Export.shp

. This shapefile must contain a series of rectangle geometries - one for each chart in the folio. Each rectangle must have a property named the_geom that contains the coordinates, and one called Name that contains the filename of the respective chart.

The folder must also contain a series of Tif images with supporting .prj sidecar files. (Note: the folios received from UKHO in Autumn 2011 do not contain sidecar fiels. Debrief generates the missing sidecar files as necessary. This is acceptable for UKHO charts, which follow a particular standard - one cannot assume it non UKHO charts follow the same standard).