This post describe in more details the two different types of bomb maps that we will be using in our tools:
- Aggregate maps of nightly Bomb Drops during the period October 7th, 1940 to 6th June, 1941 (archive record: HO193/13) [35 Map Sheets]
- Weekly plots showing day of week and bomb type: First week of the reporting period 7th – 14th October 1940 for Central & East London only (archive record: HO193/01) [8 map sheets]. Weekly maps before this time are not available.
Aggregate maps of Night Bomb Drops:
- The detailed maps are at a scale of 1: 12:500 and there are number of maps at 1:25000 for central London – as per the images shown (HO193/13).
- The London Region (Civil Defence Region 5) is divided into a series of tiles (map sheets) based on the Military Grid Projection System (MGPS).
- There are 35 different map sheets in the archive that cover each of the tiles.
- For each bomb dropped a point on the map has been recorded to show the location of where it fell
- The maps were labelled SECRET but declassified in 1971.
- The original maps are very fragile due to the quality of paper available at the time.
- 2.5 inch map sheets for each week
- Plots showing all the bombs that fell that week
- For the period of the Blitz there are 559 map sheets
- The project will use weekly bomb plots for the First week of the reporting period- for Central and East London (7th to 14th October 1940) (HO193 / 01)
- This will provide an overview of daily intensity and proof of concept to hopefully enable the remaining weekly maps to be integrated
- Maps record point of impact, a symbol is used to classify the type of bomb
- Each point of impact is in a different colour to denote the day of the week in which the bomb fell.
- The maps do not record size of bomb or bomb numbers