CoordinateSystem (NetCDF-Java CDM Public API v5.4.2)

java.lang.Object
- ucar.nc2.dataset.CoordinateSystem

```
public class CoordinateSystem
extends Object
```
A CoordinateSystem specifies the coordinates of a Variable's values. Mathematically it is a vector function F from index space to Sn:
```
  F(i,j,k,...) -> (S1, S2, ...Sn)
  where i,j,k are integers, and S is the set of reals (R) or Strings.
 
```
The components of F are just its coordinate axes:
```
  F = (A1, A2, ...An)
    A1(i,j,k,...) -> S1
    A2(i,j,k,...) -> S2
    An(i,j,k,...) -> Sn
 
```
Concretely, a CoordinateSystem is a set of coordinate axes, and an optional set of coordinate transforms. The domain rank of F is the number of dimensions it is a function of. The range rank is the number of coordinate axes.
An important class of CoordinateSystems are georeferencing Coordinate Systems, that locate a Variable's values in space and time. A CoordinateSystem that has a Lat and Lon axis, or a GeoX and GeoY axis and a Projection CoordinateTransform will have isGeoReferencing() true. A CoordinateSystem that has a Height, Pressure, or GeoZ axis will have hasVerticalAxis() true.
Further CoordinateSystems specialization is done by "data type specific" classes such as ucar.nc2.ft2.coverage.grid.GridCoordSys.
See Also:

Coordinate System Object Model

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class CoordinateSystem.Builder<T extends CoordinateSystem.Builder<T>>

Nested Classes
Modifier and Type	Class and Description
`static class`	`CoordinateSystem.Builder<T extends CoordinateSystem.Builder<T>>`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static CoordinateSystem.Builder<?>`	`builder()` Get Builder for this class that allows subclassing.
`boolean`	`containsAxes(List<CoordinateAxis> wantAxes)` Do we have all the axes in the list?
`boolean`	`containsAxis(String axisName)` Do we have the named axis?
`boolean`	`containsAxisType(AxisType wantAxisType)` Do we have an axes of the given type?
`boolean`	`containsAxisTypes(List<AxisType> wantAxes)` Do we have all the axes types in the list?
`boolean`	`containsDomain(List<Dimension> wantDimensions)` Do we have all the dimensions in the list?
`static int`	`countDomain(Variable[] axes)`
`boolean`	`equals(Object oo)` Instances which have same name, axes and transforms are equal.
`CoordinateAxis`	`findAxis(AxisType type)` Find the CoordinateAxis that has the given AxisType.
`CoordinateAxis`	`getAzimuthAxis()` get the CoordinateAxis with AxisType.RadialAzimuth, or null if none.
`com.google.common.collect.ImmutableList<CoordinateAxis>`	`getCoordinateAxes()` Get the List of CoordinateAxis objects
`com.google.common.collect.ImmutableList<CoordinateTransform>`	`getCoordinateTransforms()` Get the List of CoordinateTransform objects
`com.google.common.collect.ImmutableCollection<Dimension>`	`getDomain()` get the Collection of Dimensions that constitute the domain.
`CoordinateAxis`	`getElevationAxis()` get the CoordinateAxis with AxisType.RadialElevation, or null if none.
`CoordinateAxis`	`getEnsembleAxis()` get the CoordinateAxis with AxisType.Ensemble, or null if none.
`CoordinateAxis`	`getHeightAxis()` get the CoordinateAxis with AxisType.Height, or null if none.
`CoordinateAxis`	`getLatAxis()` get the CoordinateAxis with AxisType.Lat, or null if none.
`CoordinateAxis`	`getLonAxis()` get the CoordinateAxis with AxisType.Lon, or null if none.
`String`	`getName()` get the name of the Coordinate System
`NetcdfDataset`	`getNetcdfDataset()` Get the underlying NetcdfDataset
`CoordinateAxis`	`getPressureAxis()` get the CoordinateAxis with AxisType.Pressure, or null if none.
`ucar.unidata.geoloc.ProjectionImpl`	`getProjection()` Get the Projection for this coordinate system.
`ProjectionCT`	`getProjectionCT()` Find the first ProjectionCT from the list of CoordinateTransforms.
`CoordinateAxis`	`getRadialAxis()` get the CoordinateAxis with AxisType.RadialDistance, or null if none.
`int`	`getRankDomain()` Get the domain rank of the coordinate system = number of dimensions it is a function of.
`int`	`getRankRange()` Get the range rank of the coordinate system = number of coordinate axes.
`CoordinateAxis`	`getTaxis()` get the CoordinateAxis with AxisType.Time, or null if none.
`CoordinateAxis`	`getXaxis()` get the CoordinateAxis with AxisType.GeoX, or null if none.
`CoordinateAxis`	`getYaxis()` get the CoordinateAxis with AxisType.GeoY, or null if none.
`CoordinateAxis`	`getZaxis()` get the CoordinateAxis with AxisType.GeoZ, or null if none.
`int`	`hashCode()` Override Object.hashCode() to implement equals.
`boolean`	`hasTimeAxis()` true if has Time axis
`boolean`	`hasVerticalAxis()` true if has Height, Pressure, or GeoZ axis
`boolean`	`isComplete(Variable v)` Check if this Coordinate System is complete for v, ie if all its dimensions are also used by v.
`boolean`	`isCoordinateSystemFor(Variable v)` Check if this Coordinate System can be used for the given variable.
`boolean`	`isGeoReferencing()` true if isGeoXY or isLatLon
`boolean`	`isGeoXY()` true if it has X and Y CoordinateAxis, and a CoordTransform Projection
`boolean`	`isImplicit()` Implicit Coordinate System are constructed based on which Coordinate Variables exist for the Dimensions of the Variable.
`boolean`	`isLatLon()` true if it has Lat and Lon CoordinateAxis
`boolean`	`isProductSet()` true if all axes are CoordinateAxis1D
`boolean`	`isRadial()` true if it has radial distance and azimuth CoordinateAxis
`boolean`	`isRegular()` true if all axes are CoordinateAxis1D and are regular
`static boolean`	`isSubset(Collection<Dimension> subset, Collection<Dimension> set)` Test if all the Dimensions in subset are in set
`static boolean`	`isSubset(Set<String> subset, Set<String> set)`
`static Set<Dimension>`	`makeDomain(Iterable<? extends Variable> axes)`
`static String`	`makeName(List<CoordinateAxis> axes)` Create standard name from list of axes.
`CoordinateSystem.Builder<?>`	`toBuilder()`
`String`	`toString()`

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Method Detail
  - builder
```
public static CoordinateSystem.Builder<?> builder()
```
    Get Builder for this class that allows subclassing.
    
    See Also:
    
    "https://community.oracle.com/blogs/emcmanus/2010/10/24/using-builder-pattern-subclasses"
  - containsAxes
```
public boolean containsAxes(List<CoordinateAxis> wantAxes)
```
    Do we have all the axes in the list?
    
    Parameters:
    
    wantAxes - List of CoordinateAxis
    
    Returns:
    
    true if all in our list.
  - containsAxis
```
public boolean containsAxis(String axisName)
```
    Do we have the named axis?
    
    Parameters:
    
    axisName - (full unescaped) name of axis
    
    Returns:
    
    true if we have an axis of that name
  - containsAxisType
```
public boolean containsAxisType(AxisType wantAxisType)
```
    Do we have an axes of the given type?
    
    Parameters:
    
    wantAxisType - want this AxisType
    
    Returns:
    
    true if we have at least one axis of that type.
  - containsAxisTypes
```
public boolean containsAxisTypes(List<AxisType> wantAxes)
```
    Do we have all the axes types in the list?
    
    Parameters:
    
    wantAxes - List of AxisType
    
    Returns:
    
    true if all in our list.
  - containsDomain
```
public boolean containsDomain(List<Dimension> wantDimensions)
```
    Do we have all the dimensions in the list?
    
    Parameters:
    
    wantDimensions - List of Dimensions
    
    Returns:
    
    true if all in our list.
  - countDomain
```
public static int countDomain(Variable[] axes)
```
  - equals
```
public boolean equals(Object oo)
```
    Instances which have same name, axes and transforms are equal.
    
    Overrides:
    
    equals in class Object
  - findAxis
```
public CoordinateAxis findAxis(AxisType type)
```
    Find the CoordinateAxis that has the given AxisType. If more than one, return the one with lesser rank.
    
    Parameters:
    
    type - look for this axisType
    
    Returns:
    
    CoordinateAxis of the given AxisType, else null.
  - getAzimuthAxis
```
public CoordinateAxis getAzimuthAxis()
```
    get the CoordinateAxis with AxisType.RadialAzimuth, or null if none. if more than one, choose one with smallest rank
    
    Returns:
    
    axis of type AxisType.RadialAzimuth, or null if none
  - getCoordinateAxes
```
public com.google.common.collect.ImmutableList<CoordinateAxis> getCoordinateAxes()
```
    Get the List of CoordinateAxis objects
  - getCoordinateTransforms
```
public com.google.common.collect.ImmutableList<CoordinateTransform> getCoordinateTransforms()
```
    Get the List of CoordinateTransform objects
  - getDomain
```
public com.google.common.collect.ImmutableCollection<Dimension> getDomain()
```
    get the Collection of Dimensions that constitute the domain.
  - getElevationAxis
```
public CoordinateAxis getElevationAxis()
```
    get the CoordinateAxis with AxisType.RadialElevation, or null if none. if more than one, choose one with smallest rank
    
    Returns:
    
    axis of type AxisType.RadialElevation, or null if none
  - getEnsembleAxis
```
public CoordinateAxis getEnsembleAxis()
```
    get the CoordinateAxis with AxisType.Ensemble, or null if none. if more than one, choose one with smallest rank.
    
    Returns:
    
    axis of type AxisType.Ensemble, or null if none
  - getHeightAxis
```
public CoordinateAxis getHeightAxis()
```
    get the CoordinateAxis with AxisType.Height, or null if none. if more than one, choose one with smallest rank
    
    Returns:
    
    axis of type AxisType.Height, or null if none
  - getLatAxis
```
public CoordinateAxis getLatAxis()
```
    get the CoordinateAxis with AxisType.Lat, or null if none. if more than one, choose one with smallest rank
    
    Returns:
    
    axis of type AxisType.Lat, or null if none
  - getLonAxis
```
public CoordinateAxis getLonAxis()
```
    get the CoordinateAxis with AxisType.Lon, or null if none. if more than one, choose one with smallest rank *
    
    Returns:
    
    axis of type AxisType.Lon, or null if none
  - getName
```
public String getName()
```
    get the name of the Coordinate System
    
    Returns:
    
    the name of the Coordinate System
  - getNetcdfDataset
```
public NetcdfDataset getNetcdfDataset()
```
    Get the underlying NetcdfDataset
    
    Returns:
    
    the underlying NetcdfDataset.
  - getPressureAxis
```
public CoordinateAxis getPressureAxis()
```
    get the CoordinateAxis with AxisType.Pressure, or null if none. if more than one, choose one with smallest rank.
    
    Returns:
    
    axis of type AxisType.Pressure, or null if none
  - getProjection
```
public ucar.unidata.geoloc.ProjectionImpl getProjection()
```
    Get the Projection for this coordinate system. If isLatLon(), then returns a LatLonProjection. Otherwise, extracts the projection from any ProjectionCT CoordinateTransform.
    
    Returns:
    
    ProjectionImpl or null if none. TODO return Projection in ver6
  - getProjectionCT
```
public ProjectionCT getProjectionCT()
```
    Find the first ProjectionCT from the list of CoordinateTransforms.
    
    Returns:
    
    ProjectionCT or null if none.
  - getRadialAxis
```
public CoordinateAxis getRadialAxis()
```
    get the CoordinateAxis with AxisType.RadialDistance, or null if none. if more than one, choose one with smallest rank
    
    Returns:
    
    axis of type AxisType.RadialDistance, or null if none
  - getRankDomain
```
public int getRankDomain()
```
    Get the domain rank of the coordinate system = number of dimensions it is a function of.
    
    Returns:
    
    domain.size()
  - getRankRange
```
public int getRankRange()
```
    Get the range rank of the coordinate system = number of coordinate axes.
    
    Returns:
    
    coordAxes.size()
  - getTaxis
```
public CoordinateAxis getTaxis()
```
    get the CoordinateAxis with AxisType.Time, or null if none. if more than one, choose one with smallest rank
    
    Returns:
    
    axis of type AxisType.Time, or null if none
  - getXaxis
```
public CoordinateAxis getXaxis()
```
    get the CoordinateAxis with AxisType.GeoX, or null if none. if more than one, choose one with smallest rank
    
    Returns:
    
    axis of type AxisType.GeoX, or null if none
  - getYaxis
```
public CoordinateAxis getYaxis()
```
    get the CoordinateAxis with AxisType.GeoY, or null if none. if more than one, choose one with smallest rank
    
    Returns:
    
    axis of type AxisType.GeoY, or null if none
  - getZaxis
```
public CoordinateAxis getZaxis()
```
    get the CoordinateAxis with AxisType.GeoZ, or null if none. if more than one, choose one with smallest rank
    
    Returns:
    
    axis of type AxisType.GeoZ, or null if none
  - hashCode
```
public int hashCode()
```
    Override Object.hashCode() to implement equals.
    
    Overrides:
    
    hashCode in class Object
  - hasTimeAxis
```
public boolean hasTimeAxis()
```
    true if has Time axis
    
    Returns:
    
    true if has Time axis
  - hasVerticalAxis
```
public boolean hasVerticalAxis()
```
    true if has Height, Pressure, or GeoZ axis
    
    Returns:
    
    true if has a vertical axis
  - isComplete
```
public boolean isComplete(Variable v)
```
    Check if this Coordinate System is complete for v, ie if all its dimensions are also used by v.
    
    Parameters:
    
    v - check for this variable
    
    Returns:
    
    true if all dimensions in V (including parents) are in the domain of this coordinate system.
  - isCoordinateSystemFor
```
public boolean isCoordinateSystemFor(Variable v)
```
    Check if this Coordinate System can be used for the given variable. A CoordinateAxis can only be part of a Variable's CoordinateSystem if the CoordinateAxis' set of Dimensions is a subset of the Variable's set of Dimensions. So, a CoordinateSystem' set of Dimensions must be a subset of the Variable's set of Dimensions.
    
    Parameters:
    
    v - check for this variable
    
    Returns:
    
    true if all dimensions in the domain of this coordinate system are in V (including parents).
  - isGeoReferencing
```
public boolean isGeoReferencing()
```
    true if isGeoXY or isLatLon
    
    Returns:
    
    true if isGeoXY or isLatLon
  - isGeoXY
```
public boolean isGeoXY()
```
    true if it has X and Y CoordinateAxis, and a CoordTransform Projection
    
    Returns:
    
    true if it has X and Y CoordinateAxis, and a CoordTransform Projection
  - isImplicit
```
public boolean isImplicit()
```
    Implicit Coordinate System are constructed based on which Coordinate Variables exist for the Dimensions of the Variable. This is in contrast to a Coordinate System that is explicitly specified in the file.
    
    Returns:
    
    true if this coordinate system was constructed implicitly.
  - isLatLon
```
public boolean isLatLon()
```
    true if it has Lat and Lon CoordinateAxis
    
    Returns:
    
    true if it has Lat and Lon CoordinateAxis
  - isProductSet
```
public boolean isProductSet()
```
    true if all axes are CoordinateAxis1D
    
    Returns:
    
    true if all axes are CoordinateAxis1D
  - isRadial
```
public boolean isRadial()
```
    true if it has radial distance and azimuth CoordinateAxis
    
    Returns:
    
    true if it has radial distance and azimuth CoordinateAxis
  - isRegular
```
public boolean isRegular()
```
    true if all axes are CoordinateAxis1D and are regular
    
    Returns:
    
    true if all axes are CoordinateAxis1D and are regular
  - isSubset
```
public static boolean isSubset(Collection<Dimension> subset,
                               Collection<Dimension> set)
```
    Test if all the Dimensions in subset are in set
    
    Parameters:
    
    subset - is this a subset
    
    set - of this?
    
    Returns:
    
    true if all the Dimensions in subset are in set
  - isSubset
```
public static boolean isSubset(Set<String> subset,
                               Set<String> set)
```
  - makeDomain
```
public static Set<Dimension> makeDomain(Iterable<? extends Variable> axes)
```
  - makeName
```
public static String makeName(List<CoordinateAxis> axes)
```
    Create standard name from list of axes. Sort the axes first
    
    Parameters:
    
    axes - list of CoordinateAxis
    
    Returns:
    
    CoordinateSystem name, created from axes names
  - toBuilder
```
public CoordinateSystem.Builder<?> toBuilder()
```
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class CoordinateSystem

Nested Class Summary

Method Summary

Methods inherited from class java.lang.Object

Method Detail

builder

containsAxes

containsAxis

containsAxisType

containsAxisTypes

containsDomain

countDomain

equals

findAxis

getAzimuthAxis

getCoordinateAxes

getCoordinateTransforms

getDomain

getElevationAxis

getEnsembleAxis

getHeightAxis

getLatAxis

getLonAxis

getName

getNetcdfDataset

getPressureAxis

getProjection

getProjectionCT

getRadialAxis

getRankDomain

getRankRange

getTaxis

getXaxis

getYaxis

getZaxis

hashCode

hasTimeAxis

hasVerticalAxis

isComplete

isCoordinateSystemFor

isGeoReferencing

isGeoXY

isImplicit

isLatLon

isProductSet

isRadial

isRegular

isSubset

isSubset

makeDomain

makeName

toBuilder

toString