// cpt-city: usgs/usgs-gswa1 (cpt)
//
// A land elevation scheme used by the U.S. Geological Survey
// with modified variants by Dr. Richard L. Langford for the
// Geological Survey of Western Australia
//
// author: U.S. Geological Survey, R. Langford
// copyright: Creative Commons Attribution-NonCommercial 3.0 unported
// year: 2021
// url: https://phillips.shef.ac.uk/pub/cpt-city/usgs
#declare usgs_gswa1 =
color_map {
  [0.00000 color rgbf <0.4980,0.6235,0.3961,0.0000>]
  [0.04800 color rgbf <0.5098,0.6824,0.4314,0.0000>]
  [0.09500 color rgbf <0.6275,0.7608,0.4784,0.0000>]
  [0.14300 color rgbf <0.7294,0.8392,0.5255,0.0000>]
  [0.19000 color rgbf <0.8118,0.8863,0.6118,0.0000>]
  [0.23800 color rgbf <0.8784,0.9137,0.6510,0.0000>]
  [0.28600 color rgbf <0.9294,0.9255,0.6510,0.0000>]
  [0.33300 color rgbf <0.9490,0.8941,0.6235,0.0000>]
  [0.38100 color rgbf <0.9412,0.8235,0.5647,0.0000>]
  [0.42900 color rgbf <0.9020,0.7373,0.5333,0.0000>]
  [0.47600 color rgbf <0.8471,0.6471,0.5216,0.0000>]
  [0.52400 color rgbf <0.7725,0.5843,0.5412,0.0000>]
  [0.57100 color rgbf <0.8510,0.6471,0.6118,0.0000>]
  [0.61900 color rgbf <0.8902,0.7098,0.6941,0.0000>]
  [0.66700 color rgbf <0.9098,0.7686,0.7725,0.0000>]
  [0.71400 color rgbf <0.9255,0.8118,0.8235,0.0000>]
  [0.76200 color rgbf <0.9412,0.8392,0.8549,0.0000>]
  [0.81000 color rgbf <0.9529,0.8667,0.8824,0.0000>]
  [0.85700 color rgbf <0.9647,0.8902,0.9098,0.0000>]
  [0.90500 color rgbf <0.9725,0.9137,0.9333,0.0000>]
  [0.95200 color rgbf <0.9804,0.9412,0.9608,0.0000>]
  [1.00000 color rgbf <1.0000,1.0000,1.0000,0.0000>]
}