Processing raster rank algorithm #60605
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nirvn
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…er adopting one band per rank
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@nyalldawson , as requested, we're now looping through using a raster iterator. |
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Description
This PR introduces a new spatial analysis' raster rank algorithm:
The algorithm takes a collection of rasters as input and creates an output with cell values matching the rank order of a list of cell values take from the input collection of rasters. For e.g., if the list of input values for a given cell is [10,20,30,40] and the rank is 2, the output value will be 20.
The algorithm also allows for negative index rank. Given the same list of input values - [10,20,30,40] - using rank -2, the output value would be 30.
Finally, the algorithm offers to nodata handling behavior. By default, nodata values are excluded from the list and a given output cell will only be set to nodata if the rank is greater than the values list size. Users can also pick an alternative behavior whereas one or mode nodata values for a given cell in the input layers will result in a nodata value for that output cell. The alternative behavior matches what ArcMap is doing in its own raster rank algorithm.