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Differentiate between true and pressure altitude

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Altitude can have different meanings in aviation. So far all our
altitudes were true altitudes. But now we also require pressure altitude
including a conversion method between the two.

Maniphest Tasks: T223
This commit is contained in:
Roland Winklmeier
2018-01-12 13:29:00 +01:00
committed by Klaus Basan
parent 718d5abf90
commit 51a90a9a71
2 changed files with 43 additions and 3 deletions
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21
src/blackmisc/aviation/altitude.cpp
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@@ -16,8 +16,7 @@
#include <Qt>
#include <QtGlobal>
using BlackMisc::PhysicalQuantities::CLength;
using BlackMisc::PhysicalQuantities::CLengthUnit;
using namespace BlackMisc::PhysicalQuantities;
namespace BlackMisc
{
@@ -62,6 +61,24 @@ namespace BlackMisc
this->m_datum = MeanSeaLevel;
}
void CAltitude::convertToPressureAltitude(const CPressure &seaLevelPressure)
{
if (m_altitudeType == PressureAltitude) { return; }
static const CPressure standardPressure(1013.25, CPressureUnit::mbar());
const CPressure delta = (standardPressure - seaLevelPressure);
double deltaV = delta.value(CPressureUnit::mbar());
deltaV *= 30.0;
addValueSameUnit(deltaV);
m_altitudeType = PressureAltitude;
}
CAltitude CAltitude::toPressureAltitude(const CPressure &seaLevelPressure) const
{
CAltitude other(*this);
other.convertToPressureAltitude(seaLevelPressure);
return other;
}
void CAltitude::parseFromString(const QString &value)
{
this->parseFromString(value, PhysicalQuantities::CPqString::SeparatorsCLocale);