About the data we are using (part 2): The Bomb Maps

This post describe in more details the two different types of bomb maps that we will be using in our tools:

  1. Aggregate maps of nightly Bomb Drops during the period October 7th, 1940 to 6th June, 1941 (archive record: HO193/13) [35 Map Sheets]
  2. 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.

Index map for H0 193 13 map series (photo taken from TNA archive record HO192/ 1547-1595)

Aggregate maps of Night Bomb Drops: 

Zoom in of a Night Bombing Aggregate Map, photo taken from HO193/13 map series (Crown Copyright, The National Archives).

  • 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.

Weekly plots

Data collection map tiles for the weekly plots of the first week.

  • 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
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1 Response to About the data we are using (part 2): The Bomb Maps

  1. Pingback: Building the Android mobile prototype app for Bomb Sight | Mapping the Blitz Bomb Census

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