QGIS Gratuated Symbology gives differents results on every classification with Natural Breaks (Jenks)












3















When styling a polygon layer using the Graduated styling and the Natural Breaks (Jenks) mode, QGIS is classifying the data with different values.



So every time I click on "Classify" the values are different.



Why?



EDIT 1:



Using QGIS 3.4.4 on Windows 10






qgis symbology classification







share|improve this question

























  • I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version

    – Ian Turton♦
    7 hours ago











  • See Edit 1 for the info

    – Gob Tron
    7 hours ago











  • Using the same dataset, ArcMap complained that the number of features was too big and that I could increase the sample size if I want to. So maybe QGIS is taking a different sample of the data everytime I click on "Classify"?

    – Gob Tron
    7 hours ago













  • I can reproduce with QGIS 2.18 if there are "many" features. In my test, it occurred when more than 3001 features were to be classified in 5 classes.

    – JGH
    7 hours ago













  • Testing with 21426 polygon I got the same behavior (different value after each classification), the number of classes didn't matter. QGIS 3.4.1 on window 7

    – J.R
    6 hours ago
















3















When styling a polygon layer using the Graduated styling and the Natural Breaks (Jenks) mode, QGIS is classifying the data with different values.



So every time I click on "Classify" the values are different.



Why?



EDIT 1:



Using QGIS 3.4.4 on Windows 10






qgis symbology classification







share|improve this question

























  • I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version

    – Ian Turton♦
    7 hours ago











  • See Edit 1 for the info

    – Gob Tron
    7 hours ago











  • Using the same dataset, ArcMap complained that the number of features was too big and that I could increase the sample size if I want to. So maybe QGIS is taking a different sample of the data everytime I click on "Classify"?

    – Gob Tron
    7 hours ago













  • I can reproduce with QGIS 2.18 if there are "many" features. In my test, it occurred when more than 3001 features were to be classified in 5 classes.

    – JGH
    7 hours ago













  • Testing with 21426 polygon I got the same behavior (different value after each classification), the number of classes didn't matter. QGIS 3.4.1 on window 7

    – J.R
    6 hours ago














3












3








3








When styling a polygon layer using the Graduated styling and the Natural Breaks (Jenks) mode, QGIS is classifying the data with different values.



So every time I click on "Classify" the values are different.



Why?



EDIT 1:



Using QGIS 3.4.4 on Windows 10






qgis symbology classification







share|improve this question
















When styling a polygon layer using the Graduated styling and the Natural Breaks (Jenks) mode, QGIS is classifying the data with different values.



So every time I click on "Classify" the values are different.



Why?



EDIT 1:



Using QGIS 3.4.4 on Windows 10






qgis symbology classification




qgis symbology classification






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 7 hours ago







Gob Tron

















asked 7 hours ago









Gob TronGob Tron

979313




979313













  • I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version

    – Ian Turton♦
    7 hours ago











  • See Edit 1 for the info

    – Gob Tron
    7 hours ago











  • Using the same dataset, ArcMap complained that the number of features was too big and that I could increase the sample size if I want to. So maybe QGIS is taking a different sample of the data everytime I click on "Classify"?

    – Gob Tron
    7 hours ago













  • I can reproduce with QGIS 2.18 if there are "many" features. In my test, it occurred when more than 3001 features were to be classified in 5 classes.

    – JGH
    7 hours ago













  • Testing with 21426 polygon I got the same behavior (different value after each classification), the number of classes didn't matter. QGIS 3.4.1 on window 7

    – J.R
    6 hours ago



















  • I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version

    – Ian Turton♦
    7 hours ago











  • See Edit 1 for the info

    – Gob Tron
    7 hours ago











  • Using the same dataset, ArcMap complained that the number of features was too big and that I could increase the sample size if I want to. So maybe QGIS is taking a different sample of the data everytime I click on "Classify"?

    – Gob Tron
    7 hours ago













  • I can reproduce with QGIS 2.18 if there are "many" features. In my test, it occurred when more than 3001 features were to be classified in 5 classes.

    – JGH
    7 hours ago













  • Testing with 21426 polygon I got the same behavior (different value after each classification), the number of classes didn't matter. QGIS 3.4.1 on window 7

    – J.R
    6 hours ago

















I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version

– Ian Turton♦
7 hours ago





I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version

– Ian Turton♦
7 hours ago













See Edit 1 for the info

– Gob Tron
7 hours ago





See Edit 1 for the info

– Gob Tron
7 hours ago













Using the same dataset, ArcMap complained that the number of features was too big and that I could increase the sample size if I want to. So maybe QGIS is taking a different sample of the data everytime I click on "Classify"?

– Gob Tron
7 hours ago







Using the same dataset, ArcMap complained that the number of features was too big and that I could increase the sample size if I want to. So maybe QGIS is taking a different sample of the data everytime I click on "Classify"?

– Gob Tron
7 hours ago















I can reproduce with QGIS 2.18 if there are "many" features. In my test, it occurred when more than 3001 features were to be classified in 5 classes.

– JGH
7 hours ago







I can reproduce with QGIS 2.18 if there are "many" features. In my test, it occurred when more than 3001 features were to be classified in 5 classes.

– JGH
7 hours ago















Testing with 21426 polygon I got the same behavior (different value after each classification), the number of classes didn't matter. QGIS 3.4.1 on window 7

– J.R
6 hours ago





Testing with 21426 polygon I got the same behavior (different value after each classification), the number of classes didn't matter. QGIS 3.4.1 on window 7

– J.R
6 hours ago










1 Answer
1






active

oldest

votes


















7














Looking at the code, QGIS will take the exact values if there are up to 3000 features.
Otherwise, it will take the largest between 3000 random features or a random 10% of the data.






share|improve this answer


























  • And if you have for example 4000 features, does QGIS uses 10% of 4000 features (so 400) or it uses up to 3000 features?

    – Gob Tron
    6 hours ago






  • 1





    it will take the largest between 3000 features or a random 10% of the data

    – J.R
    6 hours ago











  • Ah! I read it wrong the first time.

    – Gob Tron
    6 hours ago











  • @GobTron I have clarified it. It will take 3000 random features

    – JGH
    6 hours ago











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









7














Looking at the code, QGIS will take the exact values if there are up to 3000 features.
Otherwise, it will take the largest between 3000 random features or a random 10% of the data.






share|improve this answer


























  • And if you have for example 4000 features, does QGIS uses 10% of 4000 features (so 400) or it uses up to 3000 features?

    – Gob Tron
    6 hours ago






  • 1





    it will take the largest between 3000 features or a random 10% of the data

    – J.R
    6 hours ago











  • Ah! I read it wrong the first time.

    – Gob Tron
    6 hours ago











  • @GobTron I have clarified it. It will take 3000 random features

    – JGH
    6 hours ago
















7














Looking at the code, QGIS will take the exact values if there are up to 3000 features.
Otherwise, it will take the largest between 3000 random features or a random 10% of the data.






share|improve this answer


























  • And if you have for example 4000 features, does QGIS uses 10% of 4000 features (so 400) or it uses up to 3000 features?

    – Gob Tron
    6 hours ago






  • 1





    it will take the largest between 3000 features or a random 10% of the data

    – J.R
    6 hours ago











  • Ah! I read it wrong the first time.

    – Gob Tron
    6 hours ago











  • @GobTron I have clarified it. It will take 3000 random features

    – JGH
    6 hours ago














7












7








7







Looking at the code, QGIS will take the exact values if there are up to 3000 features.
Otherwise, it will take the largest between 3000 random features or a random 10% of the data.






share|improve this answer















Looking at the code, QGIS will take the exact values if there are up to 3000 features.
Otherwise, it will take the largest between 3000 random features or a random 10% of the data.







share|improve this answer














share|improve this answer



share|improve this answer








edited 6 hours ago

























answered 6 hours ago









JGHJGH

12.3k21136




12.3k21136













  • And if you have for example 4000 features, does QGIS uses 10% of 4000 features (so 400) or it uses up to 3000 features?

    – Gob Tron
    6 hours ago






  • 1





    it will take the largest between 3000 features or a random 10% of the data

    – J.R
    6 hours ago











  • Ah! I read it wrong the first time.

    – Gob Tron
    6 hours ago











  • @GobTron I have clarified it. It will take 3000 random features

    – JGH
    6 hours ago



















  • And if you have for example 4000 features, does QGIS uses 10% of 4000 features (so 400) or it uses up to 3000 features?

    – Gob Tron
    6 hours ago






  • 1





    it will take the largest between 3000 features or a random 10% of the data

    – J.R
    6 hours ago











  • Ah! I read it wrong the first time.

    – Gob Tron
    6 hours ago











  • @GobTron I have clarified it. It will take 3000 random features

    – JGH
    6 hours ago

















And if you have for example 4000 features, does QGIS uses 10% of 4000 features (so 400) or it uses up to 3000 features?

– Gob Tron
6 hours ago





And if you have for example 4000 features, does QGIS uses 10% of 4000 features (so 400) or it uses up to 3000 features?

– Gob Tron
6 hours ago




1




1





it will take the largest between 3000 features or a random 10% of the data

– J.R
6 hours ago





it will take the largest between 3000 features or a random 10% of the data

– J.R
6 hours ago













Ah! I read it wrong the first time.

– Gob Tron
6 hours ago





Ah! I read it wrong the first time.

– Gob Tron
6 hours ago













@GobTron I have clarified it. It will take 3000 random features

– JGH
6 hours ago





@GobTron I have clarified it. It will take 3000 random features

– JGH
6 hours ago


















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