Package org.apache.sis.measure
Class Longitude
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- All Implemented Interfaces:
Serializable
,Comparable<Angle>
,Formattable
public final class Longitude extends Angle
A longitude angle in decimal degrees. Positive longitudes are East, while negative longitudes are West. The longitude symbol is the Greek lower-case letter lambda (λ).Longitudes are not necessarily relative to the Greenwich meridian. The prime meridian depends on the context, typically specified through the geodetic datum of a geographic CRS.
Immutability and thread safetyThis final class is immutable and thus inherently thread-safe.- Since:
- 0.3
- See Also:
Latitude
,AngleFormat
,CoordinateFormat
, Serialized Form
Defined in the
sis-utility
module
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Constructor Summary
Constructors Constructor Description Longitude(double λ)
Construct a new longitude with the specified angular value.Longitude(String string)
Constructs a newly allocatedLongitude
object that contain the angular value represented by the string.Longitude(DirectPosition position)
Constructs a newly allocated object containing the longitude value of the given position.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static double
normalize(double λ)
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Constructor Detail
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Longitude
public Longitude(double λ)
Construct a new longitude with the specified angular value. This constructor does not normalize the given value.- Parameters:
\u03bb
- longitude value in decimal degrees.
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Longitude
public Longitude(String string) throws NumberFormatException
Constructs a newly allocatedLongitude
object that contain the angular value represented by the string. The string should represent an angle in either fractional degrees (e.g. 45.5°) or degrees with minutes and seconds (e.g. 45°30'). The hemisphere (E or W) is optional (default to East).This is a convenience constructor mostly for testing purpose, since it uses a fixed locale. Developers should consider using
AngleFormat
for end-user applications instead than this constructor.- Parameters:
string
- a string to be converted to aLongitude
.- Throws:
NumberFormatException
- if the string does not contain a parsable angle, or represents a longitude angle.- See Also:
AngleFormat.parse(String)
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Longitude
public Longitude(DirectPosition position) throws IllegalArgumentException
Constructs a newly allocated object containing the longitude value of the given position. For this method, the longitude value is defined as the angular value associated to the first axis oriented toward East or West. Note that this is not necessarily the geodetic longitudes used in geographic CRS; it may also be geocentric longitudes.If the axis direction is West, then the sign of the coordinate value is inverted. If the coordinate value uses another angular units than degrees, then a unit conversion is applied.
- Parameters:
position
- the coordinate from which to extract the longitude value in degrees.- Throws:
IllegalArgumentException
- if the given coordinate it not associated to a CRS, or if no axis oriented toward East or West is found, or if that axis does not use angular units.- Since:
- 0.8
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Method Detail
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normalize
public static double normalize(double λ)
Returns the given longitude value normalized to the [-180 … 180)° range (upper value is exclusive). If the given value is outside the longitude range, then this method adds or subtracts a multiple of 360° in order to bring back the value to that range.Special cases:
- NaN values are returned unchanged
- ±∞ are mapped to NaN
- ±180° are both mapped to -180° (i.e. the range is from -180° inclusive to +180° exclusive)
- ±0 are returned unchanged (i.e. the sign of negative and positive zero is preserved)
- Parameters:
\u03bb
- the longitude value in decimal degrees.- Returns:
- the given value normalized to the [-180 … 180)° range, or NaN if the given value was NaN of infinite.
- Since:
- 0.4
- See Also:
Latitude.clamp(double)
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