Downsampling

The Downsampling operator decreases raster resolution by sampling values of an input raster.

If queried with a resolution that is finer than the input resolution, downsampling is not applicable and an error is returned.

Inputs

The Downsampling operator expects exactly one raster input.

Resolution

The target resolution can be specified either as an explicit Resolution (in pixel units) or as a Fraction that scales the input resolution.

// Scale the input resolution by a factor of 2 in both x and y directions
DownsamplingResolution::Fraction(Fraction { x: 2.0, y: 2.0 })

// Use an explicit resolution of 200×200 pixel units
DownsamplingResolution::Resolution(SpatialResolution { x: 200.0, y: 200.0 })

Parameters

Name	Type	Description	Examples
samplingMethod	DownsamplingMethod	Downsampling method.
outputResolution	DownsamplingResolution	Target output resolution.
outputOriginReference	null or Coordinate2D

Sources

Name	Type	Description
raster	RasterOperator	An operator that produces raster data.

Examples

{
    "type": "Downsampling",
    "params": {
        "samplingMethod": "nearestNeighbor",
        "outputResolution": {
            "type": "fraction",
            "x": 2,
            "y": 2
        }
    },
    "sources": {
        "raster": {
            "type": "MultiBandGdalSource",
            "params": {
                "data": "sentinel-2-l2a_EPSG32632_U8_20"
            }
        }
    }
}