Package org.apache.sis.referencing.cs
Class CoordinateSystems
java.lang.Object
org.apache.sis.util.Static
org.apache.sis.referencing.cs.CoordinateSystems
Utility methods working on
CoordinateSystem
objects and their axes.
Those methods allow for example to estimate an angle between two axes
or determining the change of axis directions and units
between two coordinate systems.- Since:
- 0.4
- Version:
- 1.3
-
Constructor Summary
ConstructorsModifierConstructorDescriptionprivate
Do not allow instantiation of this class. -
Method Summary
Modifier and TypeMethodDescriptionstatic Angle
angle
(org.opengis.referencing.cs.AxisDirection source, org.opengis.referencing.cs.AxisDirection target) Returns the arithmetic (counterclockwise) angle from the first axis direction to the second direction.private static void
components
(org.opengis.referencing.cs.CoordinateSystem cs, List<org.opengis.referencing.cs.CoordinateSystem> addTo) Adds all single coordinate systems in the given list.static org.opengis.referencing.cs.AxisDirection
directionAlongMeridian
(org.opengis.referencing.cs.AxisDirection baseDirection, double meridian) Returns an axis direction from a pole along a meridian.static org.opengis.referencing.cs.AxisDirection[]
getAxisDirections
(org.opengis.referencing.cs.CoordinateSystem cs) Returns the axis directions for the specified coordinate system.static Integer
getEpsgCode
(Class<? extends org.opengis.referencing.cs.CoordinateSystem> type, org.opengis.referencing.cs.CoordinateSystemAxis... axes) Returns the EPSG code of a coordinate system using the units and directions of given axes.static Integer
getEpsgCode
(javax.measure.Unit<?> unit, org.opengis.referencing.cs.AxisDirection... directions) Returns the EPSG code of a coordinate system using the given unit and axis directions.static String
getShortName
(org.opengis.referencing.cs.CoordinateSystemAxis axis, Locale locale) Returns a short (if possible) localized name for the given axis.(package private) static boolean
hasAllTargetTypes
(org.opengis.referencing.cs.CoordinateSystem sourceCS, org.opengis.referencing.cs.CoordinateSystem targetCS) Returnstrue
if allCoordinateSystem
interfaces oftargetCS
have a counterpart insourceCS
.static boolean
isAlongMeridian
(org.opengis.referencing.cs.AxisDirection direction) Returnstrue
if the given axis direction seems to be a direction along a meridian.static boolean
isGeodetic
(org.opengis.referencing.cs.CoordinateSystem cs) Returns whether the given coordinate system can be associated to aGeodeticCRS
.static org.opengis.referencing.cs.AxisDirection
parseAxisDirection
(String name) Returns an axis direction code from the given direction name.static org.opengis.referencing.cs.CoordinateSystem
replaceAngularUnit
(org.opengis.referencing.cs.CoordinateSystem cs, javax.measure.Unit<javax.measure.quantity.Angle> newUnit) Returns a coordinate system derived from the given one but with all angular units replaced by the given unit.static org.opengis.referencing.cs.CoordinateSystem
replaceAxes
(org.opengis.referencing.cs.CoordinateSystem cs, AxisFilter filter) Returns a coordinate system derived from the given one but with a modified list of axes.static org.opengis.referencing.cs.CoordinateSystem
replaceLinearUnit
(org.opengis.referencing.cs.CoordinateSystem cs, javax.measure.Unit<javax.measure.quantity.Length> newUnit) Returns a coordinate system derived from the given one but with all linear units replaced by the given unit.static org.opengis.referencing.operation.Matrix
swapAndScaleAxes
(org.opengis.referencing.cs.CoordinateSystem sourceCS, org.opengis.referencing.cs.CoordinateSystem targetCS) Returns an affine transform between two coordinate systems.
-
Constructor Details
-
CoordinateSystems
private CoordinateSystems()Do not allow instantiation of this class.
-
-
Method Details
-
isGeodetic
public static boolean isGeodetic(org.opengis.referencing.cs.CoordinateSystem cs) Returns whether the given coordinate system can be associated to aGeodeticCRS
. This is true for instances ofEllipsoidalCS
,CartesianCS
andSphericalCS
, and false for all other types of coordinate system.- Parameters:
cs
- the coordinate system to test (can benull
).- Returns:
- whether the given coordinate system can be associated to a geodetic CRS.
- Since:
- 1.3
-
parseAxisDirection
public static org.opengis.referencing.cs.AxisDirection parseAxisDirection(String name) throws IllegalArgumentException Returns an axis direction code from the given direction name. Names are case-insensitive. They may be:- Cardinal directions like "north" and "east".
- Inter-cardinal directions "north-east" and "south-south-east",
using either
'-'
,'_'
or spaces as separator between the cardinal points. - Directions from a pole like "South along 180 deg" and "South along 90° East",
using either the
"deg"
or"°"
symbol. Note that the meridian is not necessarily relative to Greenwich (seedirectionAlongMeridian(…)
for more information).
- Parameters:
name
- the direction name (e.g. "north", "north-east", etc.).- Returns:
- the axis direction for the given name.
- Throws:
IllegalArgumentException
- if the given name is not a known axis direction.
-
directionAlongMeridian
public static org.opengis.referencing.cs.AxisDirection directionAlongMeridian(org.opengis.referencing.cs.AxisDirection baseDirection, double meridian) Returns an axis direction from a pole along a meridian. The given meridian is usually, but not necessarily, relative to the Greenwich meridian.Example:directionAlongMeridian(AxisDirection.SOUTH, -90)
returns an axis direction for “South along 90°W”.Reference meridian
The reference meridian depends on the context. It is usually the prime meridian of the geodetic datum of the geographic CRS instance that contains (through its coordinate system) the axes having those directions. This policy is consistent with WKT 2 specification §7.5.4(iv).- Parameters:
baseDirection
- the base direction, which must beAxisDirection.NORTH
orAxisDirection.SOUTH
.meridian
- the meridian in degrees, relative to a unspecified (usually Greenwich) prime meridian. Meridians in the East hemisphere are positive and meridians in the West hemisphere are negative.- Returns:
- the axis direction along the given meridian.
- Since:
- 0.6
-
isAlongMeridian
public static boolean isAlongMeridian(org.opengis.referencing.cs.AxisDirection direction) Returnstrue
if the given axis direction seems to be a direction along a meridian.Examples Axis name Return value North along 90 deg East true
South along 90 deg East true
South false
East false
true
is not a guarantee thatparseAxisDirection(String)
will succeed. But it means that there is reasonable chances of success based on brief inspection of axis name.- Parameters:
direction
- the direction to test. Can be null.- Returns:
- if the given direction is non-null and seems to be a direction along a meridian.
- Since:
- 1.2
-
angle
public static Angle angle(org.opengis.referencing.cs.AxisDirection source, org.opengis.referencing.cs.AxisDirection target) Returns the arithmetic (counterclockwise) angle from the first axis direction to the second direction. This method returns a value between -180° and +180°, ornull
if no angle can be computed.Horizontal directions
For any pair of compass directions which are not opposite directions, a positive angle denotes a right-handed system while a negative angle denotes a left-handed system. Examples:- The angle from
EAST
toNORTH
is 90° - The angle from
SOUTH
toWEST
is -90° - The angle from "North along 90° East" to "North along 0°" is 90°.
Note: in the case of directions like “South along 90°W”, the caller is responsible to make sure that the meridians are relative to the same prime meridian. This is the case if the axes are part of the sameCoordinateSystem
instance.Horizontal and vertical directions
By convention this method defines the angle from any compass direction to theUP
vertical direction as 90°, and the angle of any compass direction to theDOWN
vertical direction as -90°. The sign of those angles gives no indication about whether the coordinate system is right-handed or left-handed. Those angles are returned as instances ofElevationAngle
.All angles are approximations since this method does not take the Earth ellipsoidal or geoidal shape in account.
Invariants
For any non-null return value:angle(A, A) = 0°
angle(A, opposite(A)) = ±180°
angle(A, B) = -angle(B, A)
- Parameters:
source
- the source axis direction.target
- the target axis direction.- Returns:
- the arithmetic angle (in degrees) of the rotation to apply on a line pointing toward
the source direction in order to make it point toward the target direction, or
null
if this value cannot be computed.
- The angle from
-
components
private static void components(org.opengis.referencing.cs.CoordinateSystem cs, List<org.opengis.referencing.cs.CoordinateSystem> addTo) Adds all single coordinate systems in the given list. This method is used for decomposing a coordinate systems into its components. -
hasAllTargetTypes
static boolean hasAllTargetTypes(org.opengis.referencing.cs.CoordinateSystem sourceCS, org.opengis.referencing.cs.CoordinateSystem targetCS) Returnstrue
if allCoordinateSystem
interfaces oftargetCS
have a counterpart insourceCS
. This method is equivalent toClasses.implementSameInterfaces(Class, Class, Class)
except that it decomposesDefaultCompoundCS
in its components before to check the two collections of interfaces.Example: ifsourceCS
is aDefaultCompoundCS
containingEllipsoidalCS
and a vertical or temporal coordinate system andtargetCS
is anEllipsoidalCS
only, then this method returnstrue
. But iftargetCS
is aCartesianCS
or contains any other CS which is not a component of source CS, then this method returnsfalse
. -
swapAndScaleAxes
public static org.opengis.referencing.operation.Matrix swapAndScaleAxes(org.opengis.referencing.cs.CoordinateSystem sourceCS, org.opengis.referencing.cs.CoordinateSystem targetCS) throws IllegalArgumentException, javax.measure.IncommensurableException Returns an affine transform between two coordinate systems. Only units and axes order (e.g. transforming from (North, West) to (East, North) are taken in account by this method.Conditions
The two coordinate systems must implement the same GeoAPI coordinate system interface. For example ifsourceCS
is aCartesianCS
, thentargetCS
must be aCartesianCS
too.Example: If coordinates insourceCS
are (x,y) tuples in metres and coordinates intargetCS
are (-y,x) tuples in centimetres, then the transformation can be performed as below:- Parameters:
sourceCS
- the source coordinate system.targetCS
- the target coordinate system.- Returns:
- the conversion from
sourceCS
totargetCS
as an affine transform. Only axis direction and units are taken in account. - Throws:
IllegalArgumentException
- if the CS are not of the same type, or axes do not match.javax.measure.IncommensurableException
- if the units are not compatible, or the conversion is non-linear.- See Also:
-
replaceAxes
public static org.opengis.referencing.cs.CoordinateSystem replaceAxes(org.opengis.referencing.cs.CoordinateSystem cs, AxisFilter filter) Returns a coordinate system derived from the given one but with a modified list of axes. The axes may be filtered (excluding some axes), reordered or have their unit and direction modified.Example: for replacing all angular units of a coordinate system to degrees (regardless what the original angular units were) while leaving other kinds of units unchanged, one can write:Coordinate system normalization
This method is often used together withswapAndScaleAxes(…)
for normalizing the coordinate values given to a math transform.Example:A rational for normalized axis order and units is explained in the Axis units and direction section in the description of the map projection package.- Parameters:
cs
- the coordinate system, ornull
.filter
- the modifications to apply on coordinate system axes.- Returns:
- the modified coordinate system as a new instance,
or
cs
if the given coordinate system was null or does not need any change. - Throws:
IllegalArgumentException
- if the specified coordinate system cannot be filtered. It may be because the coordinate system would contain an illegal number of axes, or because an axis would have an unexpected direction or unexpected unit of measurement.- Since:
- 0.6
- See Also:
-
replaceLinearUnit
public static org.opengis.referencing.cs.CoordinateSystem replaceLinearUnit(org.opengis.referencing.cs.CoordinateSystem cs, javax.measure.Unit<javax.measure.quantity.Length> newUnit) Returns a coordinate system derived from the given one but with all linear units replaced by the given unit. Non-linear units (e.g. angular or scale units) are left unchanged.This convenience method is equivalent to the following code:
- Parameters:
cs
- the coordinate system in which to replace linear units, ornull
.newUnit
- the new linear unit.- Returns:
- the modified coordinate system as a new instance, or
null
if the givencs
was null, orcs
if all linear units were already equal to the given one. - Since:
- 0.7
- See Also:
-
replaceAngularUnit
public static org.opengis.referencing.cs.CoordinateSystem replaceAngularUnit(org.opengis.referencing.cs.CoordinateSystem cs, javax.measure.Unit<javax.measure.quantity.Angle> newUnit) Returns a coordinate system derived from the given one but with all angular units replaced by the given unit. Non-angular units (e.g. linear or scale units) are left unchanged.This convenience method is equivalent to the following code:
- Parameters:
cs
- the coordinate system in which to replace angular units, ornull
.newUnit
- the new angular unit.- Returns:
- the modified coordinate system as a new instance, or
null
if the givencs
was null, orcs
if all angular units were already equal to the given one. - Since:
- 0.7
- See Also:
-
getAxisDirections
public static org.opengis.referencing.cs.AxisDirection[] getAxisDirections(org.opengis.referencing.cs.CoordinateSystem cs) Returns the axis directions for the specified coordinate system. This method guarantees that the returned array is non-null and does not contain any null direction.- Parameters:
cs
- the coordinate system.- Returns:
- the axis directions for the specified coordinate system.
- Throws:
NullArgumentException
- ifcs
is null, or one of its axes is null, or a value returned byCoordinateSystemAxis.getDirection()
is null.- Since:
- 0.8
-
getShortName
public static String getShortName(org.opengis.referencing.cs.CoordinateSystemAxis axis, Locale locale) Returns a short (if possible) localized name for the given axis. This method replaces names such as "Geodetic latitude" or "Geocentric latitude" by a simple "Latitude" word. This method can be used for example in column or row headers when the context is known and the space is rare.- Parameters:
axis
- the axis for which to get a short label.locale
- desired locale for the label.- Returns:
- a relatively short axis label, in the desired locale if possible.
- Since:
- 1.3
-
getEpsgCode
public static Integer getEpsgCode(Class<? extends org.opengis.referencing.cs.CoordinateSystem> type, org.opengis.referencing.cs.CoordinateSystemAxis... axes) Returns the EPSG code of a coordinate system using the units and directions of given axes. This method ignores axis metadata (names, abbreviation, identifiers, remarks, etc.). The axis minimum and maximum values are checked only if the range meaning is "wraparound". If no suitable coordinate system is known to Apache SIS, then this method returnsnull
.Current implementation uses a hard-coded list of known coordinate systems; it does not yet scan the EPSG database (this may change in future Apache SIS version). The current list of known coordinate systems is given below.
Known coordinate systems (CS) EPSG CS type Axis directions Horizontal unit 6424 Ellipsoidal east north degree 6422 Ellipsoidal north east degree 6425 Ellipsoidal east north grads 6403 Ellipsoidal north east grads 6429 Ellipsoidal east north radian 6428 Ellipsoidal north east radian 6426 Ellipsoidal east north up degree 6423 Ellipsoidal north east up degree 6427 Ellipsoidal east north up grads 6421 Ellipsoidal north east up grads 6431 Ellipsoidal east north up radian 6430 Ellipsoidal north east up radian 4400 Cartesian east north metre 4500 Cartesian north east metre 4491 Cartesian west north metre 4501 Cartesian north west metre 6503 Cartesian west south metre 6501 Cartesian south west metre 1039 Cartesian east north foot 1029 Cartesian north east foot 4403 Cartesian east north Clarke’s foot 4502 Cartesian north east Clarke’s foot 4497 Cartesian east north US survey foot - Parameters:
type
- the type of coordinate system for which an EPSG code is desired, as a GeoAPI interface.axes
- axes for which a coordinate system EPSG code is desired.- Returns:
- EPSG codes for a coordinate system using the given axes (ignoring metadata), or
null
if unknown to this method. Note that a null value does not mean that a more extensive search in the EPSG database would not find a matching coordinate system. - Since:
- 1.0
- See Also:
-
getEpsgCode
public static Integer getEpsgCode(javax.measure.Unit<?> unit, org.opengis.referencing.cs.AxisDirection... directions) Returns the EPSG code of a coordinate system using the given unit and axis directions. This convenience method performs the work documented ingetEpsgCode(Class, CoordinateSystemAxis...)
, but requiring only a frequently used subset of information. If no suitable coordinate system is known to Apache SIS, then this method returnsnull
.Current implementation uses a hard-coded list of known coordinate systems; it does not yet scan the EPSG database (this may change in future Apache SIS version). The current list of known coordinate systems is documented above.
- Parameters:
unit
- desired unit of measurement. For three-dimensional ellipsoidal coordinate system, this is the unit for the horizontal axes only; the vertical axis is in metres.directions
- desired axis directions.- Returns:
- EPSG codes for a coordinate system using the given axis directions and unit of measurement,
or
null
if unknown to this method. Note that a null value does not mean that a more extensive search in the EPSG database would not find a matching coordinate system. - Since:
- 0.8
- See Also:
-