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

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