Extract maximum values from raster by polygons

[toddsams]

I have a continuous raster and a set of polygons that overlap the raster.

Does anyone know of a method to:

1) identify the maximum value of the raster within each polygon
2) extract the cells associated with these maximum values and store as a separate raster (or points)

Any suggestions are greatly appreciated.

[XanderBakker · Accepted solution]

I have a continuous raster and a set of polygons that overlap the raster.

Does anyone know of a method to:

1) identify the maximum value of the raster within each polygon
2) extract the cells associated with these maximum values and store as a separate raster (or points)

Any suggestions are greatly appreciated.

Hi Todd,

Try this:

• Perform a Zonal Statistics (using the polygons as zones, the raster as values and MAXIMUM as stistics type)


• Calculate a boolean raster with: ValueRas = MaxRas (value 1 will indicate those pixels locations with maximum value in polygon)


• Use the SetNull to obtain a raster holding only the maximum values at the locations you're interested in and rest NoData: OutRas =  SetNull(BooleanRas, MaxRast, "Value = 0")


• Convert this "OutRas" to points

Kind regards,

Xander

[FatihDur]

Just for the references, there is a step-by-step guide to very same process in How To: Create points representing the highest or lowest elevations within polygon features