64 lines
2.0 KiB
Go
64 lines
2.0 KiB
Go
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package basic
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import (
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"math"
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"testing"
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)
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func TestRefractionFromApparentAltitudeStandardAtmosphere(t *testing.T) {
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assertClose(t, "Refraction@0deg", RefractionFromApparentAltitude(0, 1010, 10), 0.483032, 0.0001)
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assertClose(t, "Refraction@45deg", RefractionFromApparentAltitude(45, 1010, 10), 0.016878, 0.0001)
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}
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func TestRefractionRoundTrip(t *testing.T) {
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cases := []struct {
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altitude float64
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pressureHPa float64
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temperatureC float64
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}{
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{-1, 980, 25},
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{0, 1010, 10},
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{5, 1013.25, 15},
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{15, 900, -10},
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{45, 1010, 0},
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{80, 1030, 30},
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}
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for _, tc := range cases {
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apparentAltitude := ApparentAltitude(tc.altitude, tc.pressureHPa, tc.temperatureC)
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trueAltitude := TrueAltitude(apparentAltitude, tc.pressureHPa, tc.temperatureC)
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assertClose(t, "TrueAltitudeRoundTrip", trueAltitude, tc.altitude, 1e-9)
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trueFromApparent := TrueAltitude(tc.altitude, tc.pressureHPa, tc.temperatureC)
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apparentFromTrue := ApparentAltitude(trueFromApparent, tc.pressureHPa, tc.temperatureC)
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assertClose(t, "ApparentAltitudeRoundTrip", apparentFromTrue, tc.altitude, 1e-9)
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}
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}
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func TestRefractionScalingAndBounds(t *testing.T) {
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lowPressure := RefractionFromApparentAltitude(0, 980, 10)
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highPressure := RefractionFromApparentAltitude(0, 1030, 10)
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if !(lowPressure < highPressure) {
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t.Fatalf("pressure scaling mismatch: low %.12f high %.12f", lowPressure, highPressure)
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}
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cold := RefractionFromApparentAltitude(0, 1010, 0)
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hot := RefractionFromApparentAltitude(0, 1010, 30)
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if !(cold > hot) {
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t.Fatalf("temperature scaling mismatch: cold %.12f hot %.12f", cold, hot)
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}
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if RefractionFromApparentAltitude(-6, 1010, 10) != 0 {
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t.Fatalf("refraction below lower limit should be 0")
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}
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if RefractionFromApparentAltitude(95, 1010, 10) != 0 {
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t.Fatalf("refraction above upper limit should be 0")
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}
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if !math.IsNaN(RefractionFromApparentAltitude(0, 0, 10)) {
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t.Fatalf("invalid pressure should produce NaN")
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}
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if !math.IsNaN(RefractionFromApparentAltitude(0, 1010, -274)) {
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t.Fatalf("invalid temperature should produce NaN")
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}
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}
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