RasterProfileSampler Namespace Reference

Functions
ProfileSection::Section	buildRasterProfile (const QString &rasterPath, int band, const SpatialReferenceSystem *canvasSRS, const QVector< QPointF > &scenePolyline, double vertFactor=1.0, double stepHint=0.0)
	Resample scenePolyline at fixed arc length and sample the DEM at each point.

Function Documentation

buildRasterProfile()

ProfileSection::Section RasterProfileSampler::buildRasterProfile	(	const QString &	rasterPath,
		int	band,
		const SpatialReferenceSystem *	canvasSRS,
		const QVector< QPointF > &	scenePolyline,
		double	vertFactor = 1.0,
		double	stepHint = 0.0
	)

Resample scenePolyline at fixed arc length and sample the DEM at each point.

Parameters

rasterPath	GDAL-readable path of the DEM (GISRasterLayer::filePath()).
band	1-based band index (GISRasterLayer::renderBand()).
canvasSRS	CRS the traced polyline is expressed in. May be null — then no reprojection is attempted (polyline is assumed to already be in the raster's CRS).
scenePolyline	Traced vertices in scene coords (sx = canvasX, sy = -canvasY) — the convention MapToolMeshProfile emits.
vertFactor	Multiplier turning raw DEM Z into model vertical units (TerrainToolbar::verticalToModelFactor()). Ground is reported as rawZ * vertFactor so the profile lines up with node inverts / rims.
stepHint	Optional fixed arc-length step (scene units). When ≤ 0 the step is half a DEM pixel, projected into scene units.

Returns

A ground-only section. Empty when the raster can't be opened or the polyline has < 2 vertices. Samples outside the DEM keep ground = NaN, which the chart renders as a gap.

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