Sound maps are built from repeatable measurement methods

Evidence

This isobel map of Stanley Park in Vancouver, British Columbia, shows average sound levels in different locations. Sound level measurements were taken on the footpaths at intervals of about 100 yards, between the hours of 10 a.m. and 4 p.m. on several successive Wednesdays during May, June and July of 1973. The weather each day was similar—clear and bright with temperatures in the middle 60s and 70s F. At each point three readings were taken, ten seconds apart, and later averaged together for the construction of the isobels. — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 884

Categorization

• SEED: This exact measurement protocol (path intervals, repeated Wednesdays, averaged triplicate readings at fixed times) is a replicable template for any reader wanting to build their own isobel map of a local park.
• corroborated: 2 independent passages support this claim — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 884
• XREF: connects to: Soundwalks use mapped scores to guide attention to specific sounds — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 695; Isobel and events maps offer concrete soundscape notation methods — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 452; Sound events can be compared historically and geographically by mapping — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 887 (+1 more)

Broader Connections

• Sound events can be compared historically and geographically by mapping #expands (0.75) — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 887