Temporal Raster Aggregation

The TemporalRasterAggregation operator aggregates a raster time series into uniform time windows. The output starts with the first window that contains the query start and contains all windows that overlap the query interval.

Pixel values are computed by aggregating all input rasters that contribute to the current window.

Inputs

The TemporalRasterAggregation operator expects exactly one raster input.

Errors

If the aggregation method is first, last, or mean and the input raster has no NO DATA value, an error is returned.

Parameters

Name	Type	Description	Examples
aggregation	Aggregation	Aggregation method for values within each time window. Encountering NO DATA makes the aggregation result NO DATA unless ignoreNoData is true for the selected aggregation variant.
window	TimeStep	Window size and granularity for the output time series.
windowReference	null or TimeInstance
outputType	null or RasterDataType

Sources

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

Examples

{
    "type": "TemporalRasterAggregation",
    "params": {
        "aggregation": {
            "type": "mean",
            "ignoreNoData": true
        },
        "window": {
            "granularity": "months",
            "step": 1
        }
    },
    "sources": {
        "raster": {
            "type": "Expression",
            "params": {
                "expression": "(A - B) / (A + B)",
                "outputType": "F32",
                "outputBand": {
                    "name": "NDVI",
                    "measurement": {
                        "type": "unitless"
                    }
                },
                "mapNoData": false
            },
            "sources": {
                "raster": {
                    "type": "GdalSource",
                    "params": {
                        "data": "ndvi"
                    }
                }
            }
        }
    }
}