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How to calculate the sum of zonal statistics?
Consider, for example, a zone that is 2,500 rows and columns of cells in size, and the value of each cell is 1,000. The sum for that zone would be 2,500 x 2,500 x 1,000 = 6.25 billion. If an integer output is required and the range is within ± 2.147 billion, you can apply the Int tool.
How is zone data used in zonal statistics?
The input zone layer defines the shape, values, and locations of the zones. An integer field in the zone input is specified to define the zones. A string field can also be used. Both raster and feature datasets can be used as the zone dataset. The input value raster contains the input values used in calculating the output statistic for each zone.
Which is an example of zonal Statistics in ArcGIS?
The output zonal statistics raster. This example determines for each zone the range of cell values in the Value input raster. This example determines for each zone the range of cell values in the Value input raster. # Name: ZonalStatistics_Ex_02.py # Description: Calculates statistics on values of a raster # within the zones of another dataset.
What does the nodata mean in zonal statistics?
NODATA — Within any particular zone, if any NoData cells exist in the Value raster, it is deemed that there is insufficient information to perform statistical calculations for all the cells in that zone; therefore, the entire zone will receive the NoData value on the output raster. The output zonal statistics raster.
How is the sum of all cells in a zone calculated?
The sum of all the cell values in each zone is assigned to all cells in that zone. The data type of the output raster is floating point. This is because the value for the sum tends to be quite large, and it may not be possible to represent it with an integer value.
How is a zonal statistic calculated in ArcGIS?
With the Zonal Statistics tool, a statistic is calculated for each zone defined by a zone dataset, based on values from another dataset (a value raster). A single output value is computed for every zone in the input zone dataset.