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General sound map

Recordings of background atmospheres and incidental noises from all over London. Some form part of a sound grid series recorded at evenly-spaced points across the city, each marking the centre of a square on the map below.

1 3 5
2 4 3 3 11
1 1 1 1 6 5 7 16 21 3 18 1 1
2 8 22 11 3 5 5 17 5 4 2 1 4 1  
3 11 4 7 9 6 25 39 21 38 8 1 5    
1 3 5 7 5 48 42 56 38 11 8 3 2
1 1 2 7 6 15 8 40 15 5 1 1 4
1 1 41 2 8 4 1 9 7 1 1
3 4 3 7 1 3 5 2  
6 1 20 6 1 3 1 1
1 1 2 1 1
1 1

Above: graphic based on a daytime satellite image courtesy of the Image Science and Analysis Laboratory, NASA Johnson Space Center. Each red grid square is 2.5 miles or 4 kilometers across.

Ravensbourne Keston 1:00

Grid square: Hayes, Keston

Recording date: 26 February 2012

Time of day: 2.45pm

Location: Barnet Wood, Keston.

Description: Loud cooing of a wood pigeon close by, other birdsong, distant traffic.

Technical guff: Headworn stereo. 2 x DPA 2006C mics, Sound Devices MixPre-D preamp, Soby PCM M10 recorder.

Recorded by: IM Rawes

Additional notes: None.

Ravensbourne Bromley Common 1:00

Grid square: Hayes, Keston

Recording date: 24 February 2012

Time of day: 1pm

Location: South of Scrogginhall Wood, Bromley Common.

Description: A tiny stream joins the Ravensbourne near a private fishing lake, birdsong, very faint music.

Technical guff: Headworn stereo. 2 x DPA 2006C mics, Sound Devices MixPre-D preamp, Sony PCM M10 recorder.

Recorded by: IM Rawes

Additional notes: None.

TQ 4023 6551 1:00

Grid square: Hayes, Keston

Recording date: 23 April 2009

Time of day: 11.20am

Location: Hayes Common, just east of Prestons Road.

Description: Birdsong in deciduous woodland, aircraft drone, and distant steady traffic noise from Croydon Road to the south.

Technical guff: Head-worn stereo. 2 x Shure WL-183 mics. Edirol R09-HR digital recorder.

Recorded by: IM Rawes

Additional notes: None.

About general sound map recordings

The majority of recordings on the general sound map are simply of curious or distinctive sounds heard around London. Some also appear elsewhere as part of the 12 Tones of London statistical recording project, and here are subsumed into their appropriate grid squares.

These kinds of recordings always have descriptive file names which don't require any further explanation. But just over a hundred others have ones consisting only of the letters 'TQ' followed by eight digits. These are the Ordnance Survey co-ordinates marking the exact centre of each of the sound map's 112 grid squares, and so these file names tell you with some precision where the recordings were made. Reaching each point was done with the help of a GPS receiver and a willingness to scramble over fences and run onto golf courses. The contents of those recordings are summarised in the graphic below:

The key on the left-hand side shows the most common sound categories encountered. The louder a particular sound type encountered at the centre of a grid square, the darker its icon. More than one icon of the same kind means that sound takes up more of the recording's length. Despite the wide spacing of the recording points and the brief duration of the sound files, they seem to do a reasonable job of plotting in outline the common or persistent sound types heard around London during the daytime.