Package org.djunits.quantity

Class Speed.Unit

java.lang.Object

org.djunits.unit.AbstractUnit<Speed.Unit,Speed>

org.djunits.quantity.Speed.Unit

All Implemented Interfaces:

UnitInterface<Speed.Unit,Speed>

Enclosing class:

Speed

public static class Speed.Unit
extends AbstractUnit<Speed.Unit,Speed>

Speed.Unit encodes the units of the rate of change of a position over time.

Copyright (c) 2025-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See for project information https://djunits.org. The DJUNITS project is distributed under a three-clause BSD-style license.

Author:

Alexander Verbraeck

Field Summary

Fields

Modifier and Type	Field	Description
static final Speed.Unit	ft_h	ft/h.
static final Speed.Unit	ft_min	ft/min.
static final Speed.Unit	ft_s	ft/s.
static final Speed.Unit	in_h	in/h.
static final Speed.Unit	in_min	in/min.
static final Speed.Unit	in_s	in/s.
static final Speed.Unit	km_h	km/h.
static final Speed.Unit	km_s	km/s.
static final Speed.Unit	kt	knot = Nautical Mile per hour.
static final Speed.Unit	m_h	m/h.
static final Speed.Unit	m_s	Meter per second.
static final Speed.Unit	mi_h	mi/h.
static final Speed.Unit	mi_min	mi/min.
static final Speed.Unit	mi_s	mi/s.
static final Speed.Unit	SI	The SI or BASE unit.
static final SIUnit	SI_UNIT	The dimensions of Speed: m/s.

Constructor Summary

Constructors

Constructor	Description
Unit(String id, String name, double scaleFactorToBaseUnit, UnitSystem unitSystem)	Create a new Speed unit.
Unit(String textualAbbreviation, String displayAbbreviation, String name, Scale scale, UnitSystem unitSystem)	Return a derived unit for this unit, with textual abbreviation(s) and a display abbreviation.

Method Summary

Modifier and Type	Method	Description
Speed.Unit	deriveUnit(String textualAbbreviation, String displayAbbreviation, String name, double scaleFactor, UnitSystem unitSystem)	Return a linearly scaled derived unit for this unit, with textual abbreviation(s) and a display abbreviation.
Speed.Unit	getBaseUnit()	Return the base unit for this unit.
Speed	ofSi(double si)	Return an SI-quantity for this unit with a value.
SIUnit	siUnit()	Return the SI unit for this unit.

Methods inherited from class org.djunits.unit.AbstractUnit

deriveUnit, equals, generateSiPrefixes, getDisplayAbbreviation, getId, getName, getScale, getSiPrefix, getStoredDisplayAbbreviation, getStoredName, getStoredTextualAbbreviation, getTextualAbbreviation, getUnitSystem, hashCode, setSiPrefix, setSiPrefix, setSiPrefixKilo, setSiPrefixPer, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.djunits.unit.UnitInterface

fromBaseValue, quantityInUnit, toBaseValue

Field Details

SI_UNIT

public static final SIUnit SI_UNIT

The dimensions of Speed: m/s.

m_s

public static final Speed.Unit m_s

Meter per second.

SI

public static final Speed.Unit SI

The SI or BASE unit.

m_h

public static final Speed.Unit m_h

m/h.

km_s

public static final Speed.Unit km_s

km/s.

km_h

public static final Speed.Unit km_h

km/h.

in_s

public static final Speed.Unit in_s

in/s.

in_min

public static final Speed.Unit in_min

in/min.

in_h

public static final Speed.Unit in_h

in/h.

ft_s

public static final Speed.Unit ft_s

ft/s.

ft_min

public static final Speed.Unit ft_min

ft/min.

ft_h

public static final Speed.Unit ft_h

ft/h.

mi_s

public static final Speed.Unit mi_s

mi/s.

mi_min

public static final Speed.Unit mi_min

mi/min.

mi_h

public static final Speed.Unit mi_h

mi/h.

kt

public static final Speed.Unit kt

knot = Nautical Mile per hour.

Constructor Details

Unit

public Unit(String id,
 String name,
 double scaleFactorToBaseUnit,
 UnitSystem unitSystem)

Create a new Speed unit.

Parameters:

id - the id or main abbreviation of the unit

name - the full name of the unit

scaleFactorToBaseUnit - the scale factor of the unit to convert it TO the base (SI) unit

unitSystem - the unit system such as SI or IMPERIAL

Unit

public Unit(String textualAbbreviation,
 String displayAbbreviation,
 String name,
 Scale scale,
 UnitSystem unitSystem)

Return a derived unit for this unit, with textual abbreviation(s) and a display abbreviation.

Parameters:

textualAbbreviation - the textual abbreviation of the unit, which doubles as the id

displayAbbreviation - the display abbreviation of the unit

name - the full name of the unit

scale - the scale to use to convert between this unit and the standard (e.g., SI, BASE) unit

unitSystem - unit system, e.g. SI or Imperial

Method Details

siUnit

public SIUnit siUnit()

Description copied from interface: UnitInterface

Return the SI unit for this unit.

Returns:

the SI unit for this unit

getBaseUnit

public Speed.Unit getBaseUnit()

Description copied from interface: UnitInterface

Return the base unit for this unit.

Returns:

the base unit for this unit

ofSi

public Speed ofSi(double si)

Description copied from interface: UnitInterface

Return an SI-quantity for this unit with a value.

Parameters:

si - the value in SI or BASE units

Returns:

an SI-quantity for this unit with the given si-value

deriveUnit

public Speed.Unit deriveUnit(String textualAbbreviation,
 String displayAbbreviation,
 String name,
 double scaleFactor,
 UnitSystem unitSystem)

Description copied from class: AbstractUnit

Return a linearly scaled derived unit for this unit, with textual abbreviation(s) and a display abbreviation.

Specified by:

deriveUnit in class AbstractUnit<Speed.Unit,Speed>

Parameters:

textualAbbreviation - the textual abbreviation of the unit, which doubles as the id

displayAbbreviation - the display abbreviation of the unit

name - the full name of the unit

scaleFactor - the (linear) scale factor to multiply with the current (linear) scale factor

unitSystem - unit system, e.g. SI or Imperial

Returns:

a derived unit for this unit