<complexType name="AbstractGriddedSurfaceType">
<annotation>
<documentation>A gridded surface is a parametric curve
surface derived from a rectangular grid in the parameter
space. The rows from this grid are control points for
horizontal surface curves; the columns are control points
for vertical surface curves. The working assumption is that
for a pair of parametric co-ordinates (s, t) that the
horizontal curves for each integer offset are calculated
and evaluated at "s". The defines a sequence of control
points:
cn(s) : s 1 .....columns
From this sequence a vertical curve is calculated for "s",
and evaluated at "t". In most cases, the order of
calculation (horizontal-vertical vs. vertical-horizontal)
does not make a difference. Where it does, the horizontal-
vertical order shall be the one used.
Logically, any pair of curve interpolation types can lead
to a subtype of GriddedSurface. The following clauses
define some most commonly encountered surfaces that can
be represented in this manner.</documentation>
</annotation>
<complexContent>
<extension base="gml:AbstractParametricCurveSurfaceType">
<sequence>
<group ref="gml:PointGrid">
<annotation>
<documentation>This is the double indexed sequence
of control points, given in row major form.
NOTE! There in no assumption made about the shape
of the grid.
For example, the positions need not effect a "21/2D"
surface, consecutive points may be equal in any or all
of the ordinates. Further, the curves in either or both
directions may close.</documentation>
</annotation>
</group>
<element name="rows" type="integer" minOccurs="0">
<annotation>
<documentation>The attribute rows gives the number
of rows in the parameter grid.</documentation>
</annotation>
</element>
<element name="columns" type="integer" minOccurs="0">
<annotation>
<documentation>The attribute columns gives the number
of columns in the parameter grid.</documentation>
</annotation>
</element>
</sequence>
</extension>
</complexContent>
</complexType>
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XSD Schema Diagram:
