Class CoverageContours

Namespace

EncDotNet.S100.Datasets.Pipelines.Portrayal

Assembly

EncDotNet.S100.Core.dll

Turns the value-based ContourStyles of an ICoverageStyle into Isolines over a sampled coverage, ready for an IsolineCoverageSubLayer, which both renderers draw (lines of constant pixel width with labels along them).

public static class CoverageContours

Inheritance

object

CoverageContours

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Remarks

The lines are traced with marching squares (IsolineTracer) through the field's values in the StyledCoverageLayer that CoveragePipeline sampled, so they follow the viewport subset and stride the pipeline chose. No-data nodes break the lines.

Only contours whose Value lies within the sample's range are traced, so a style can list every level it might ever need (every 4 hPa from 860 to 1100, say) at no cost.

Methods

Trace(StyledCoverageLayer, string, IReadOnlyList<ContourStyle>, Func<ContourStyle, string>?, Func<double, double, (double Longitude, double Latitude)>?)

Traces each of contours through the fieldName values of layer.

public static IReadOnlyList<Isoline> Trace(StyledCoverageLayer layer, string fieldName, IReadOnlyList<ContourStyle> contours, Func<ContourStyle, string>? formatLabel = null, Func<double, double, (double Longitude, double Latitude)>? nativeToWgs84 = null)

Parameters

layer StyledCoverageLayer

The sampled coverage, from ProcessAsync(ICoverageSource, ICoverageStyle, Viewport?, ICrsTransform?, MarinerSettings?, CancellationToken).

fieldName string

The field the contours are traced on; its unit is the contours' Unit.

contours IReadOnlyList<ContourStyle>

The contours, e.g. Contours.

formatLabel Func<ContourStyle, string>

The label of a contour with ShowLabel set; the value in the invariant culture when null. A contour without ShowLabel gets an empty label and is drawn unlabelled.

nativeToWgs84 Func<double, double, (double Longitude, double Latitude)>

Converts the grid's native coordinates (x, y) to WGS-84 (longitude, latitude), or null when the grid is geographic (EPSG:4326), as weather grids are.

Returns

IReadOnlyList<Isoline>

The isolines, in EPSG:3857 metres, in the order of contours.

Exceptions

KeyNotFoundException

The sample has no field called fieldName.