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@UML(identifier="CV_HexagonalGridCoverage",
specification=ISO_19123)
public interface HexagonalGridCoverage
Evaluates a coverage at direct positions within a network of hexagons centered on a set of grid
points. Evaluation is based on interpolation between the centres of the ValueHexagons
surrounding the input position.
Coverages are sometimes based on tessellations composed of regular hexagons. Such tessellations are usually called hexagonal grids. In fact, the centers of a set of regular hexagons that form such a tessellation correspond to the grid points of a quadrilateral grid. That grid can be described as a rectified grid in which the two offset vectors are of equal length but differ in direction by 60°. The length of a side of the hexagon is L = S×tan 30°, where S is the length of the offset vector. This means that the values in the coverage range can be stored as a grid values matrix and accessed through a sequence rule. The hexagons are the Thiessen polygons that are generated around the grid points.
NOTE: A set of Thiessen polygons generated from the grid points of any 2-dimensional rectified grid described by two offset vectors that are equal in length but not orthogonal will be a set of congruent hexagons. The hexagons will be irregular unless the offset vectors differ in direction by exactly 60°.
| Method Summary | |
|---|---|
Set |
evaluate(DirectPosition p,
Collection<String> list)
Returns a set of records of feature attribute values for the specified direct position. |
Set<ValueHexagon> |
getElements()
Returns the set of value objects used to evaluate the coverage. |
InterpolationMethod |
getInterpolationMethod()
Returns the interpolation method to be used in evaluating the coverage. |
GridValuesMatrix |
getSource()
Links this hexagonal coverage to the grid values matrix for which it is an evaluator. |
Set<ValueHexagon> |
locate(DirectPosition p)
Returns the set of values hexagon that include the domain objects containing the specified direct position. |
| Methods inherited from interface ContinuousCoverage |
|---|
evaluate, evaluateInverse, getInterpolationParameterTypes, select |
| Methods inherited from interface Coverage |
|---|
evaluate, evaluate, evaluate, evaluate, evaluate, evaluate, find, find, getCommonPointRule, getCoordinateReferenceSystem, getDimensionNames, getDomainElements, getDomainExtents, getEnvelope, getMetadataNames, getMetadataValue, getNumSampleDimensions, getRangeElements, getRangeType, getRenderableImage, getSampleDimension, getSources, list |
| Method Detail |
|---|
@UML(identifier="element",
obligation=OPTIONAL,
specification=ISO_19123)
Set<ValueHexagon> getElements()
getElements in interface ContinuousCoverage
@UML(identifier="interpolationType",
obligation=OPTIONAL,
specification=ISO_19123)
InterpolationMethod getInterpolationMethod()
getInterpolationMethod in interface ContinuousCoverage
@UML(identifier="locate",
obligation=OPTIONAL,
specification=ISO_19123)
Set<ValueHexagon> locate(DirectPosition p)
locate in interface ContinuousCoverage
@UML(identifier="evaluate",
obligation=MANDATORY,
specification=ISO_19123)
Set evaluate(DirectPosition p,
Collection<String> list)
@UML(identifier="source",
obligation=MANDATORY,
specification=ISO_19123)
GridValuesMatrix getSource()
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