|
||||||||||
PREV PACKAGE NEXT PACKAGE | FRAMES NO FRAMES |
See:
Description
Class Summary | |
---|---|
AlbersEqualArea | Albers Equal Area Projection (EPSG code 9822). |
AlbersEqualArea.Provider | The math transform provider for an Albers Equal Area projection (EPSG code 9822). |
EquatorialOrthographic | The equatorial case of the Orthographic projection. |
EquatorialStereographic | The USGS equatorial case of the stereographic projection. |
EquidistantCylindrical | Equidistant cylindrical projection (EPSG code 9823). |
EquidistantCylindrical.Provider | The math transform provider for an Equidistant Cylindrical projection (EPSG code 9823). |
HotineObliqueMercator | Hotine Oblique Mercator projection. |
HotineObliqueMercator.Provider | The math transform provider for a Hotine Oblique Mercator projection (EPSG code 9812). |
HotineObliqueMercator.Provider_TwoPoint | The math transform provider for a Hotine Oblique Mercator projection, specified with two points on the central line (instead of a central point and azimuth). |
Krovak | Krovak Oblique Conformal Conic projection (EPSG code 9819). |
Krovak.Provider | The math transform provider for an Krovak projection (EPSG code 9819). |
LambertAzimuthalEqualArea | Lambert Azimuthal Equal Area (EPSG code 9820). |
LambertAzimuthalEqualArea.Provider | The math transform provider for an Lambert Equal Area projection (EPSG code 9820). |
LambertConformal | Lambert Conical Conformal Projection. |
LambertConformal1SP | Lambert Conical Conformal 1SP Projection. |
LambertConformal1SP.Provider | The math transform provider for a Lambert Conformal 1SP projection (EPSG code 9801). |
LambertConformal2SP | Lambert Conical Conformal 2SP Projection. |
LambertConformal2SP.Provider | The math transform provider for a Lambert Conformal 2SP projection (EPSG code 9802). |
LambertConformalBelgium | Lambert Conical Conformal 2SP Belgium Projection. |
LambertConformalBelgium.Provider | The math transform provider for a Lambert Conformal 2SP Belgium projection (EPSG code 9803). |
MapProjection | Base class for transformation services between ellipsoidal and cartographic projections. |
MapProjection.AbstractProvider | The base provider for MapProjection s. |
Mercator | Mercator Cylindrical Projection. |
Mercator1SP | Mercator Cylindrical 1SP Projection. |
Mercator1SP.Provider | The math transform provider for a Mercator 1SP projection (EPSG code 9804). |
Mercator2SP | Mercator Cylindrical 2SP Projection. |
Mercator2SP.Provider | The math transform provider for a Mercator 2SP projection (EPSG code 9805). |
MercatorPseudoProvider | Supports the popular visualisation projection used by Google, Microsoft, Yahoo, OSM and others |
NewZealandMapGrid | The NZMG (New Zealand Map Grid) projection. |
NewZealandMapGrid.Provider | The math transform provider for New Zealand Map Grid (EPSG code 27200). |
ObliqueMercator | Oblique Mercator Projection. |
ObliqueMercator.Provider | The math transform provider for an Oblique Mercator projection (EPSG code 9815). |
ObliqueMercator.Provider_TwoPoint | The math transform provider for a Oblique Mercator projection, specified with two points on the central line (instead of a central point and azimuth). |
ObliqueOrthographic | The oblique case of the Orthographic projection. |
ObliqueStereographic | Provides the transform equations for the Oblique Stereographic (EPSG code 9809). |
ObliqueStereographic.Provider | The math transform provider for a stereographic projection of any kind. |
Orthographic | Orthographic Projection. |
Orthographic.Provider | The math transform provider for a Orthographic projection. |
PlateCarree | Plate Carree (or Equirectangular) projection. |
PlateCarree.Provider | The math transform provider for an Plate Carree projection. |
PolarOrthographic | The polar case of the Orthographic projection. |
PolarStereographic | The polar case of the stereographic projection. |
PolarStereographic.ProviderA | The math transform provider for a Polar Stereographic projection. |
PolarStereographic.ProviderB | The math transform provider for a Polar Stereographic (Variant B) projection. |
PolarStereographic.ProviderNorth | The math transform provider for a North Polar Stereographic projection. |
PolarStereographic.ProviderSouth | The math transform provider for a South Polar Stereographic projection. |
Stereographic | Stereographic Projection. |
Stereographic.Provider | The math transform provider for a Stereographic projections using USGS equations. |
TransverseMercator | Transverse Mercator Projection (EPSG code 9807). |
TransverseMercator.Provider | The math transform provider for a Transverse Mercator projection (EPSG code 9807). |
TransverseMercator.Provider_SouthOrientated | The math transform provider for a South Orientated Transverse Mercator projection (EPSG code 9808). |
Exception Summary | |
---|---|
PointOutsideEnvelopeException | Thrown by MapProjection when a map projection failed because the point is
outside the envelope of validity. |
ProjectionException | Thrown by MapProjection when a map projection failed. |
Basic implementations of map projections. This package is mostly for internal purpose and should usually not be used
directly. Consider using MathTransformFactory
instead.
Many geographic coordinate reference systems use axis in (latitude,longitude) order, but not all. Axis order, orientation and units are CRS-dependent. For example some CRS use longitude values increasing toward East, while some others use longitude values increasing toward West. The axis order must be specified in all CRS, and any method working with them should take their axis order and units in account.
However, map projections defined in this package are transformation steps, not final CRS. All projections defined in this package must complies with the OGC 01-009 specification. This specification said (quoting section 10.6 at page 34):
Cartographic projection transforms are used by projected coordinate reference systems to map geographic coordinates (e.g. Longitude and Latitude) into (X,Y) coordinates. These (X,Y) coordinates can be imagined to lie on a plane, such as a paper map or a screen. All cartographic projection transforms will have the following properties:
- Converts from (Longitude, Latitude) coordinates to (X,Y).
- All angles are assumed to be decimal degrees, and all distances are assumed to be meters.
- The domain should be a subset of {[-180,180)×(-90,90)}.
Although all cartographic projection transforms must have the properties listed above, many projected coordinate reference systems have different properties. For example, in Europe some projected coordinate reference systems use grads instead of decimal degrees, and often the base geographic coordinate reference system is (Latitude, Longitude) instead of (Longitude, Latitude). This means that the cartographic projected transform is often used as a single step in a series of transforms, where the other steps change units and swap ordinates.
The Geotools implementation extends this rule to axis directions as well, i.e.
(X,Y) coordinates must be (East,
North) orientated. This rule implies a non-intuitive
behavior for the Transverse Mercator South Orientated projection, which still projects coordinates
with Y values increasing toward North. The real axis flip is performed by the rest of the CRS framework
upon coordinate system axis inspection. In order to
get a real South orientated projection, the cartographic transform must be concatenated with an affine transform.
This is done automatically if the projected CRS is created
with the Geotools's createProjectedCRS
convenience method with a South orientated coordinate system
in argument.
In order to reduce the risk of confusion, this package never defines south orientated
MapProjection
implementations. The providers always
create south-orientated projections as a concatenation of their north-orientated variants with an affine
transform. This approach removes all ambiguity when reading a transform in
Well
Known Text (WKT) format, since only the north-orientated variant is used and the affine transform
coefficients tell exactly which axis flips are applied.
|
||||||||||
PREV PACKAGE NEXT PACKAGE | FRAMES NO FRAMES |