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Zonal Statistics is returning null values in ArcGIS

Does Zonal Statistics value change when applied on subset of data using ArcGIS Spatal Analyst?Zonal Statistics as table creates output but some are NullHow to Calculate Custom Zonal Statistics?ArcGIS 10.0 height statistics for polygon features: zonal statistics vs interpolate shapeResampling gives higher MEAN when using zonal statisticsExtract results from zonal statisticsInconsistent results using Zonal Statistics by Table for Min in ArcGIS Desktop?QGIS Zonal Statistics for polygons is missing results?How does QGIS Zonal Statistics handle partially overlapping pixels?Putting raster values in polygons ArcGIS

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2

I am using Zonal Statistics as Table to obtain the Max height from a DEM for each polygon (then Joined to the polygons). For some reason, a lot of the polygons get NULL returned. All the polygons returning Null appear to be between 1 - 4 cells in size (given the DEM scale). Other same sized polygons are however returning the expected result. 154 out of 3131 polygons have NULL values

I have used the Identify tool to check that I do have non-null values in the underlying DEM for a bunch of these.

The problem appears to be the FID is not being created for the Zonal Statistics table for some polygons. I have checked a couple of other small polygons and the values obtained from Zonal Statistics appear correct. What should I be looking for/testing? How can I correct this?

I am using ArcGIS Desktop v10.6 with Advanced License.

arcgis-desktop zonal-statistics null

share|improve this question

asked 2 hours ago

Esme_Esme_

396516

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Have you tried resampling the DEM to a higher resolution?
  
  – BERA
  1 hour ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you - that has fixed the problem (if you post an answer I will accept it). Can you please explain why this would fix things?
  
  – Esme_
  1 hour ago
  

  
  
  
  

add a comment | 

2

I am using Zonal Statistics as Table to obtain the Max height from a DEM for each polygon (then Joined to the polygons). For some reason, a lot of the polygons get NULL returned. All the polygons returning Null appear to be between 1 - 4 cells in size (given the DEM scale). Other same sized polygons are however returning the expected result. 154 out of 3131 polygons have NULL values

I have used the Identify tool to check that I do have non-null values in the underlying DEM for a bunch of these.

The problem appears to be the FID is not being created for the Zonal Statistics table for some polygons. I have checked a couple of other small polygons and the values obtained from Zonal Statistics appear correct. What should I be looking for/testing? How can I correct this?

I am using ArcGIS Desktop v10.6 with Advanced License.

arcgis-desktop zonal-statistics null

share|improve this question

asked 2 hours ago

Esme_Esme_

396516

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Have you tried resampling the DEM to a higher resolution?
  
  – BERA
  1 hour ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you - that has fixed the problem (if you post an answer I will accept it). Can you please explain why this would fix things?
  
  – Esme_
  1 hour ago
  

  
  
  
  

add a comment | 

I am using Zonal Statistics as Table to obtain the Max height from a DEM for each polygon (then Joined to the polygons). For some reason, a lot of the polygons get NULL returned. All the polygons returning Null appear to be between 1 - 4 cells in size (given the DEM scale). Other same sized polygons are however returning the expected result. 154 out of 3131 polygons have NULL values

I have used the Identify tool to check that I do have non-null values in the underlying DEM for a bunch of these.

The problem appears to be the FID is not being created for the Zonal Statistics table for some polygons. I have checked a couple of other small polygons and the values obtained from Zonal Statistics appear correct. What should I be looking for/testing? How can I correct this?

I am using ArcGIS Desktop v10.6 with Advanced License.

arcgis-desktop zonal-statistics null

share|improve this question

asked 2 hours ago

Esme_Esme_

396516

share|improve this question

asked 2 hours ago

Esme_Esme_

396516

share|improve this question

asked 2 hours ago

Esme_Esme_

396516

asked 2 hours ago

Esme_Esme_

396516

asked 2 hours ago

Esme_Esme_

396516

1 Answer
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2

You could try resampling the raster to a finer resolution. Not sure why this can work but when Reading the help section for version 10.3 (not present in 10.6):

If the zone input is a feature dataset with relatively small features,
keep in mind that the resolution of the information needs to be
appropriate relative to the resolution of the value raster. If the
areas of single features are similar to or smaller than the area of
single cells in the value raster, in the feature-to-raster conversion
some of these zones may not be represented.

share|improve this answer

answered 1 hour ago

BERABERA

17.5k62144

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I had the same problem. Especially features that were very thin had null values. So I think when they do not cross the centroid of the raster cell, you get NULLS.
  
  – blabbath
  1 hour ago
  

  
  
  
  

add a comment | 

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2

You could try resampling the raster to a finer resolution. Not sure why this can work but when Reading the help section for version 10.3 (not present in 10.6):

If the zone input is a feature dataset with relatively small features,
keep in mind that the resolution of the information needs to be
appropriate relative to the resolution of the value raster. If the
areas of single features are similar to or smaller than the area of
single cells in the value raster, in the feature-to-raster conversion
some of these zones may not be represented.

share|improve this answer

answered 1 hour ago

BERABERA

17.5k62144

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I had the same problem. Especially features that were very thin had null values. So I think when they do not cross the centroid of the raster cell, you get NULLS.
  
  – blabbath
  1 hour ago
  

  
  
  
  

add a comment | 

2

You could try resampling the raster to a finer resolution. Not sure why this can work but when Reading the help section for version 10.3 (not present in 10.6):

If the zone input is a feature dataset with relatively small features,
keep in mind that the resolution of the information needs to be
appropriate relative to the resolution of the value raster. If the
areas of single features are similar to or smaller than the area of
single cells in the value raster, in the feature-to-raster conversion
some of these zones may not be represented.

share|improve this answer

answered 1 hour ago

BERABERA

17.5k62144

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I had the same problem. Especially features that were very thin had null values. So I think when they do not cross the centroid of the raster cell, you get NULLS.
  
  – blabbath
  1 hour ago
  

  
  
  
  

add a comment | 

You could try resampling the raster to a finer resolution. Not sure why this can work but when Reading the help section for version 10.3 (not present in 10.6):

If the zone input is a feature dataset with relatively small features,
keep in mind that the resolution of the information needs to be
appropriate relative to the resolution of the value raster. If the
areas of single features are similar to or smaller than the area of
single cells in the value raster, in the feature-to-raster conversion
some of these zones may not be represented.

share|improve this answer

answered 1 hour ago

BERABERA

17.5k62144

share|improve this answer

answered 1 hour ago

BERABERA

17.5k62144

answered 1 hour ago

BERABERA

17.5k62144

answered 1 hour ago

BERABERA

17.5k62144