How to calculate the height of a specified (by feature) area

[HenkMassink]

First
I have a raster with heights and a shape-file with polygon-features representing areas.
For each area I would like to know the average height.

Second
What I really would like is that I add a field with a height to each polygon and that ArcGIS calculates the difference in height with the raster for that specific area. More difficult to explain 🙂

Finding a solution for the first step would be great.

[HenkMassink]

Meanwhile, I am also thinking and searching.:)
A possible solution is to convert the shape layer with the features to a raster.
Second start to compare both rasters.

I still hope to find an easier method.

[DanielHayhurst]

I have the same issue, i have a lidar based height model for the canopy for a forests, primary height information is what i'm interested in.

I also have a polygon shape file divided by species, establishment date and its also divided into a gridded pattern (1hectars), my goal is to sample the average height for all lidar cells which falls 50%or more under each polygon and add it to the shape file table.

So far I've only been able to sample on a single or multiple point locations, not for areas, is there a tool which allows the average height to be sampled from an polygon (area)


Daniel

[EricRice]

Greetings,

See Zonal Statistics as Table.  You can use this tool to get the mean value per zone (polygon).

Regards,
Eric

[HenkMassink]

Eric, thanks this is exactly where I was looking for.

Greetings from the Netherlands