AscGridSource¶

Namespace: ThinkGeo.Core

A grid read from an ESRI ASCII Grid file (.asc / .grd): its size, extent and no-data value from the header, its values from the rows. The file is opened on each GridSource.FillValues(GridSlot[]) call and only the rows holding requested cells are read, so a large grid costs what the view shows; a renderer that needs every cell - the GPU map's fills and contours - reads the file whole.

public sealed class AscGridSource : GridSource

Inheritance object → GridSource → AscGridSource

Properties¶

ColumnCount¶

How many cells across.

public int ColumnCount { get; }

Property Value¶

int

RowCount¶

How many cells down.

public int RowCount { get; }

Property Value¶

int

Extent¶

The ground the grid covers, in GridSource.SourceProjection.

public RectangleShape Extent { get; }

Property Value¶

RectangleShape

SourceProjection¶

The coordinate system GridSource.Extent is in, or null when it is the map's.

public Projection SourceProjection { get; }

Property Value¶

Projection

Constructors¶

AscGridSource(string, Projection)¶

public AscGridSource(string pathFilename, Projection sourceProjection)

Parameters¶

pathFilename string
Path to the ESRI ASCII Grid file.

sourceProjection Projection

        The coordinate system the file's coordinates are in - the file does not say - or null
        when it is the map's.

Methods¶

FillValuesCore(GridSlot[])¶

protected void FillValuesCore(GridSlot[] samples)

Parameters¶

samples GridSlot[]

Returns¶

void

Events¶

Changed¶

Raised when the values change, so the maps drawing the grid draw it again.

public event EventHandler Changed;