Standard map scales derived from USGS 2002 report on map scales https://pubs.usgs.gov/fs/2002/0015/report.pdf
Format
A data frame with 36 rows and 16 variables:
scale
Scale name
standard
Standard (USGS, architectural, or engineering)
series
Series name (USGS map scales only)
actual_ft
Scale distance for 1 ft actual.
actual_ft_unit
Unit of scale for 1 ft actual.
scale_in
Actual distance for 1 in scale.
scale_in_unit
Unit of actual distance for 1 in scale.
scale_in_accuracy
Accuracy of 1 in scale (approximate or exact)
scale_cm
Actual distance for 1 cm scale.
scale_cm_unit
Unit of actual distance for 1 cm scale.
scale_cm_accuracy
Accuracy of 1 cm scale (approximate or exact)
size_latlon
Standard size in latitude/longitude
size_latlon_unit
Unit of latitude/longitude size (minutes or degrees)
area_approx
Approximate actual area
area_approx_unit
Approximate area unit
series_status
Series status (select USGS map series are "abandoned")
Details
Common architectural and engineering scales derived from FEMA guide to using scales https://www.usfa.fema.gov/downloads/pdf/nfa/engineer-architect-scales.pdf