Basic Raster operations

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Zonal statistics

The Zonal Statistics allows the combination of vector and raster data.

It calculates the statistics for each vector feature on the basis of the raster layer (see table below).

Statistic	Description
Count	Number of cells with valid values in each zone.
Sum	Total sum of values within each zone.
Mean	Average value within each zone.
Median	Middle value in the distribution within zones.
Standard Deviation	Measure of the amount of variation or dispersion.
Minimum	Lowest value within each zone.
Maximum	Highest value within each zone.
Range	Difference between the maximum and minimum values.
Minority	Least frequently occurring value within zones.
Majority	Most frequently occurring value within zones.
Variety	Number of unique values within each zone.
Variance	Measure of the spread of values within each zone.

1. Click ´Processing -> Toolbox -> Search for Zonal Statistics

2. Input Layer: Select your vector layer

3. Raster Layer: Select your raster layer

4. Statistics to calculate: Here you can select the statistic you want to calculate. For example the mean temperature of SPI.

5. Zonal Statistics: Speficiy where you want to save the results and give it a good name.