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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






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








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.



Screenshot of Identify tool output showing DEM value and NULL from Zonal Statistics



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

















  • 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

















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.



Screenshot of Identify tool output showing DEM value and NULL from Zonal Statistics



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

















  • 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













2












2








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.



Screenshot of Identify tool output showing DEM value and NULL from Zonal Statistics



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














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.



Screenshot of Identify tool output showing DEM value and NULL from Zonal Statistics



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




arcgis-desktop zonal-statistics null






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 2 hours ago









Esme_Esme_

396516




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












  • 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







1




1





Have you tried resampling the DEM to a higher resolution?

– BERA
1 hour ago






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





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










1 Answer
1






active

oldest

votes


















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


















  • 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
    50 mins ago











Your Answer








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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









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


















  • 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
    50 mins ago















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


















  • 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
    50 mins ago













2












2








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













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












share|improve this answer



share|improve this answer










answered 1 hour ago









BERABERA

17.5k62144




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
    50 mins ago












  • 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
    50 mins ago







1




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
50 mins ago





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
50 mins ago

















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