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IDW with a clipped geometry

RachelS

Hi,
Can anyone tell me is there a way to use IDW with a clipped geometry.
I have 10 polygons with points inside them. I only want the interpolation to run within the polygons as they are not related to each other.
I tried the input barrier polyline option by converting the polygons to polylines but this didn't work and still interpolated outside the polylines.

Any help much appreciated.
Regards
Rachel

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Accepted answers

SteveLynch

Hi,
I tried the input barrier polyline option by converting the polygons to polylines but this didn't work and still interpolated outside the polylines.

The barrier option in IDW uses a "line of sight" technique to determine which points are used when making a prediction at a location. Therefore, for example, if you have high values to the left of a barrier and low values to the right then your output will have a clear "split".

The mask option that is suggested by m.gasior clips the output after all the interpolation has been done.

You have to decide what you want, viz.,
- predictions should be influenced by the barrier, then use the barrier option
- clip the output after interpolation is done then use the mask environment option.

Hope this helps
Steve

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MarcinGasior

You can try using raster analysis mask:

- In IDW tool dialog window click Environments
- In Raster Analysis section select your polygon layer as Mask

SteveLynch

Hi,
I tried the input barrier polyline option by converting the polygons to polylines but this didn't work and still interpolated outside the polylines.

RachelS

Thanks for you replies,
It looks like I'll use the polyline barrier as I want adjustments made before the interpolation rather than after with the mask.
Many thanks
Rachel

SteveLynch

Rachel

If you also have Geostatistical Analyst and ArcGIS10+ I would suggest that you try Kernel Interpolation With Barriers

The advantages include; optional standard error of prediction output and it does not use "line of sight" but rather "shortest distance around the barrier".

REgards
Steve

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