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Best approach to extract depth values from multibeam raster for mulitple polygons?

Question asked by JMRutherford on Nov 27, 2017
Latest reply on Nov 27, 2017 by Dan_Patterson

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Hello

So I have a multibeam image with the depths in at 5 m resolution and I have several (over 1000) polygons in one feature class (geodatabase). I would like to have the max and min depth for each polygon. I am not to sure how to go about this. I did see that there have been similar questions asked before and some suggestions said to use model builder and iterate feature selection tool.

I am not to sure of this so I was hoping someone could tel me if this is possible, and how I might go about this.

Thanks

Jess

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Dan_Patterson

Nov 27, 2017 1:46 PM

and they recommended zonal statistics and/or zonal statistics as table?

But you have multiple images? or just one?.

The number of polygons isn't the problem as long as they are singlepart polygons. The zonal statistics as table will give you all the stats at once, rather than having to do an output of min, then max etc.

Picture? number of images with the depth data? nature of the zones? and whether they are all in the same coordinate system would be useful.

Also a link to your preferred reference would save people having to reinvent the search wheel, if you have one.

Other suggestions could follow from what you provide.

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JMRutherford @ Dan_Patterson on Nov 27, 2017 4:43 PM

Hi Dan

I have one feature class with the polygon, and I have several multibeam raster images, however I am interested in the polygons that fall within the specific multibeam. All polygons are singlepart polygons. I am happy to just use zonal statics, however I still need to extract the data from the multibeam image. Essentially what I was wondering is, how I would go about extracting mulitbeam image for each polygon? Once I had this feature, then I guess your saying I would just do zonal statistics?

Yes everything is in the same projected coordinate system.

?? I am not too sure what you mean about 'preferred reference'?

By the way I did try to tackle this, by way of

Thanks

Jess

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Dan_Patterson

@ JMRutherford on Nov 27, 2017 4:54 PM

I assume you have a raster, don't care if it is a multibeam or whatever, but can it be used in...

Zonal statistics or better still, since you really only need a table of results.

Zonal Statistics as Table

But you should check How Zonal Statistics Works

So if you can 'beam' into the polygon, then you should be good

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Dan_Patterson Nov 27, 2017 1:46 PM
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and they recommended zonal statistics and/or zonal statistics as table?
But you have multiple images? or just one?.
The number of polygons isn't the problem as long as they are singlepart polygons. The zonal statistics as table will give you all the stats at once, rather than having to do an output of min, then max etc.
Picture? number of images with the depth data? nature of the zones? and whether they are all in the same coordinate system would be useful.
Also a link to your preferred reference would save people having to reinvent the search wheel, if you have one.
Other suggestions could follow from what you provide.
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- JMRutherford @ Dan_Patterson on Nov 27, 2017 4:43 PM
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  Hi Dan
  I have one feature class with the polygon, and I have several multibeam raster images, however I am interested in the polygons that fall within the specific multibeam. All polygons are singlepart polygons. I am happy to just use zonal statics, however I still need to extract the data from the multibeam image. Essentially what I was wondering is, how I would go about extracting mulitbeam image for each polygon? Once I had this feature, then I guess your saying I would just do zonal statistics?
  
  Yes everything is in the same projected coordinate system.
  ?? I am not too sure what you mean about 'preferred reference'?
  
  By the way I did try to tackle this, by way of
  
  Thanks
  Jess
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  - Dan_Patterson @ JMRutherford on Nov 27, 2017 4:54 PM
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    Correct Answer
    I assume you have a raster, don't care if it is a multibeam or whatever, but can it be used in...
    Zonal statistics or better still, since you really only need a table of results.
    Zonal Statistics as Table
    But you should check How Zonal Statistics Works
    So if you can 'beam' into the polygon, then you should be good
    1 person found this helpful
    Like • Show 0 Likes0
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