diagram |
|
namespace |
http://www.opengis.net/gml |
children |
gml:location gml:refDirection gml:inDimension gml:outDimension |
used by |
|
annotation |
documentation | A placement takes a standard geometric
construction and places it in geographic space. It defines a
transformation from a constructive parameter space to the
co-ordinate space of the co-ordinate reference system being used.
Parameter spaces in formulae in this International Standard are
given as (u, v) in 2D and(u, v, w) in 3D. Co-ordinate reference
systems positions are given in formulae, in this International
Standard, by either (x, y) in 2D, or (x, y, z) in 3D.
Affine placements are defined by linear transformations from
parameter space to the target co-ordiante space. 2-dimensional
Cartesian parameter space,(u,v) transforms into 3-dimensional co-
ordinate reference systems,(x,y,z) by using an affine
transformation,(u,v)->(x,y,z) which is defined :
x ux vx x0
u
y = uy vy + y0
v
x uz vz z0
Then, given this equation, the location element of the
AffinePlacement is the direct position (x0, y0, z0), which is the
target position of the origin in (u, v). The two reference
directions (ux, uy, uz) and (vx, vy, vz) are the target
directions of the unit vectors at the origin in (u, v). |
|
source |
<xs:complexType name="AffinePlacementType">
<xs:annotation>
<xs:documentation>A placement takes a standard geometric
construction and places it in geographic space. It defines a
transformation from a constructive parameter space to the
co-ordinate space of the co-ordinate reference system being used.
Parameter spaces in formulae in this International Standard are
given as (u, v) in 2D and(u, v, w) in 3D. Co-ordinate reference
systems positions are given in formulae, in this International
Standard, by either (x, y) in 2D, or (x, y, z) in 3D.
Affine placements are defined by linear transformations from
parameter space to the target co-ordiante space. 2-dimensional
Cartesian parameter space,(u,v) transforms into 3-dimensional co-
ordinate reference systems,(x,y,z) by using an affine
transformation,(u,v)->(x,y,z) which is defined :
x ux vx x0
u
y = uy vy + y0
v
x uz vz z0
Then, given this equation, the location element of the
AffinePlacement is the direct position (x0, y0, z0), which is the
target position of the origin in (u, v). The two reference
directions (ux, uy, uz) and (vx, vy, vz) are the target
directions of the unit vectors at the origin in (u, v).</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="location" type="gml:DirectPositionType">
<xs:annotation>
<xs:documentation>The location property gives
the target of the parameter space origin. This is the vector
(x0, y0, z0) in the formulae above.</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element name="refDirection" type="gml:VectorType" maxOccurs="unbounded">
<xs:annotation>
<xs:documentation>The attribute refDirection gives the
target directions for the co-ordinate basis vectors of the
parameter space. These are the columns of the matrix in the
formulae given above. The number of directions given shall be
inDimension. The dimension of the directions shall be
outDimension.</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element name="inDimension" type="positiveInteger">
<xs:annotation>
<xs:documentation>Dimension of the constructive parameter
space.</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element name="outDimension" type="positiveInteger">
<xs:annotation>
<xs:documentation>Dimension of the co-ordinate space.</xs:documentation>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:complexType> |
diagram |
|
namespace |
http://www.opengis.net/gml |
type |
gml:DirectPositionType |
properties |
|
used by |
|
attributes |
Name | Type | Use | Default | Fixed | annotation | srsName | xs:anyURI | optional | | | documentation | In general this reference points to a CRS instance of gml:CoordinateReferenceSystemType
(see coordinateReferenceSystems.xsd). For well known references it is not required that the CRS description exists at the
location the URI points to. If no srsName attribute is given, the CRS must be specified as part of the larger context this
geometry element is part of, e.g. a geometric element like point, curve, etc. It is expected that this attribute will be specified
at the direct position level only in rare cases. |
| srsDimension | xs:positiveInteger | optional | | | documentation | The "srsDimension" is the length of coordinate sequence (the number of entries in the list). This dimension is
specified by the coordinate reference system. When the srsName attribute is omitted, this attribute shall be omitted. |
| axisLabels | gml:NCNameList | optional | | | documentation | Ordered list of labels for all the axes of this CRS. The gml:axisAbbrev value should be used for these axis
labels, after spaces and forbiddden characters are removed. When the srsName attribute is included, this attribute is optional.
When the srsName attribute is omitted, this attribute shall also be omitted. |
| uomLabels | gml:NCNameList | optional | | | documentation | Ordered list of unit of measure (uom) labels for all the axes of this CRS. The value of the string in the
gml:catalogSymbol should be used for this uom labels, after spaces and forbiddden characters are removed. When the
axisLabels attribute is included, this attribute shall also be included. When the axisLabels attribute is omitted, this attribute
shall also be omitted. |
|
|
annotation |
documentation | The location property gives
the target of the parameter space origin. This is the vector
(x0, y0, z0) in the formulae above. |
|
source |
<xs:element name="location" type="gml:DirectPositionType">
<xs:annotation>
<xs:documentation>The location property gives
the target of the parameter space origin. This is the vector
(x0, y0, z0) in the formulae above.</xs:documentation>
</xs:annotation>
</xs:element> |
diagram |
|
namespace |
http://www.opengis.net/gml |
type |
gml:VectorType |
properties |
isRef | 0 | minOcc | 1 | maxOcc | unbounded | content | complex |
|
attributes |
Name | Type | Use | Default | Fixed | annotation | srsName | xs:anyURI | optional | | | documentation | In general this reference points to a CRS instance of gml:CoordinateReferenceSystemType
(see coordinateReferenceSystems.xsd). For well known references it is not required that the CRS description exists at the
location the URI points to. If no srsName attribute is given, the CRS must be specified as part of the larger context this
geometry element is part of, e.g. a geometric element like point, curve, etc. It is expected that this attribute will be specified
at the direct position level only in rare cases. |
| srsDimension | xs:positiveInteger | optional | | | documentation | The "srsDimension" is the length of coordinate sequence (the number of entries in the list). This dimension is
specified by the coordinate reference system. When the srsName attribute is omitted, this attribute shall be omitted. |
| axisLabels | gml:NCNameList | optional | | | documentation | Ordered list of labels for all the axes of this CRS. The gml:axisAbbrev value should be used for these axis
labels, after spaces and forbiddden characters are removed. When the srsName attribute is included, this attribute is optional.
When the srsName attribute is omitted, this attribute shall also be omitted. |
| uomLabels | gml:NCNameList | optional | | | documentation | Ordered list of unit of measure (uom) labels for all the axes of this CRS. The value of the string in the
gml:catalogSymbol should be used for this uom labels, after spaces and forbiddden characters are removed. When the
axisLabels attribute is included, this attribute shall also be included. When the axisLabels attribute is omitted, this attribute
shall also be omitted. |
|
|
annotation |
documentation | The attribute refDirection gives the
target directions for the co-ordinate basis vectors of the
parameter space. These are the columns of the matrix in the
formulae given above. The number of directions given shall be
inDimension. The dimension of the directions shall be
outDimension. |
|
source |
<xs:element name="refDirection" type="gml:VectorType" maxOccurs="unbounded">
<xs:annotation>
<xs:documentation>The attribute refDirection gives the
target directions for the co-ordinate basis vectors of the
parameter space. These are the columns of the matrix in the
formulae given above. The number of directions given shall be
inDimension. The dimension of the directions shall be
outDimension.</xs:documentation>
</xs:annotation>
</xs:element> |