Module: GitFit::Elevation::TerrainCoeff::Lookup

Defined in:
lib/git_fit/elevation/terrain_lookup.rb

Class Method Summary collapse

Class Method Details

.hysteresis_threshold(model_pav_h, m_val) ⇒ Object 



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# File 'lib/git_fit/elevation/terrain_lookup.rb', line 24

def hysteresis_threshold(model_pav_h, m_val)
  return 2.0 if m_val <= 0
  return 2.0 if m_val <= model_pav_h[0][0]
  return model_pav_h[-1][1] if m_val >= model_pav_h[-1][0]
  model_pav_h.each_with_index do |(_xk, yk), i|
    next unless i + 1 < model_pav_h.size
    return yk if m_val <= model_pav_h[i + 1][0]
  end
  model_pav_h[-1][1]
end

.nearest_neighbor_spacing(model_lookup, gain_per_km, range_per_km, seg_density) ⇒ Object 



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# File 'lib/git_fit/elevation/terrain_lookup.rb', line 8

def nearest_neighbor_spacing(model_lookup, gain_per_km, range_per_km, seg_density)
  best = nil
  best_dist = Float::INFINITY
  model_lookup.each do |ref|
    d = Math.sqrt(
      (gain_per_km.to_f - ref['gk'])**2 +
      (range_per_km.to_f - ref['rk'])**2 +
      (seg_density.to_f - ref['sd'])**2,
    )
    next unless d < best_dist
    best_dist = d
    best = ref
  end
  best ? best['sp'] : 181
end