QGIS Gratuated Symbology gives differents results on every classification with Natural Breaks (Jenks)
Clash Royale CLAN TAG#URR8PPP
5
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
asked Feb 11 at 16:50
Gob TronGob Tron
989313
add a comment |
5
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
asked Feb 11 at 16:50
Gob TronGob Tron
989313
I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version
– Ian Turton♦
Feb 11 at 16:54
See Edit 1 for the info
– Gob Tron
Feb 11 at 16:57
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
Feb 11 at 17:02
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
Feb 11 at 17:03
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
Feb 11 at 17:11
add a comment |
5
5
5
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
asked Feb 11 at 16:50
Gob TronGob Tron
989313
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
asked Feb 11 at 16:50
Gob TronGob Tron
989313
asked Feb 11 at 16:50
Gob TronGob Tron
989313
edited Feb 11 at 16:56
Gob Tron
asked Feb 11 at 16:50
Gob TronGob Tron
989313
asked Feb 11 at 16:50
Gob TronGob Tron
989313
asked Feb 11 at 16:50
Gob TronGob Tron
989313
989313
I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version
– Ian Turton♦
Feb 11 at 16:54
See Edit 1 for the info
– Gob Tron
Feb 11 at 16:57
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
Feb 11 at 17:02
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
Feb 11 at 17:03
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
Feb 11 at 17:11
add a comment |
I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version
– Ian Turton♦
Feb 11 at 16:54
See Edit 1 for the info
– Gob Tron
Feb 11 at 16:57
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
Feb 11 at 17:02
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
Feb 11 at 17:03
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
Feb 11 at 17:11
I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version
– Ian Turton♦
Feb 11 at 16:54
I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version
– Ian Turton♦
Feb 11 at 16:54
See Edit 1 for the info
– Gob Tron
Feb 11 at 16:57
See Edit 1 for the info
– Gob Tron
Feb 11 at 16:57
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
Feb 11 at 17:02
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
Feb 11 at 17:02
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
Feb 11 at 17:03
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
Feb 11 at 17:03
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
Feb 11 at 17:11
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
Feb 11 at 17:11
add a comment |
1 Answer
1
active
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votes
9
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.
answered Feb 11 at 17:12
JGHJGH
12.9k21139
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
Feb 11 at 17:17
1
it will take the largest between 3000 features or a random 10% of the data
– J.R
Feb 11 at 17:19
Ah! I read it wrong the first time.
– Gob Tron
Feb 11 at 17:20
@GobTron I have clarified it. It will take 3000 random features
– JGH
Feb 11 at 17:25
add a comment |
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1 Answer
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1 Answer
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9
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.
answered Feb 11 at 17:12
JGHJGH
12.9k21139
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
Feb 11 at 17:17
1
it will take the largest between 3000 features or a random 10% of the data
– J.R
Feb 11 at 17:19
Ah! I read it wrong the first time.
– Gob Tron
Feb 11 at 17:20
@GobTron I have clarified it. It will take 3000 random features
– JGH
Feb 11 at 17:25
add a comment |
9
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.
answered Feb 11 at 17:12
JGHJGH
12.9k21139
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
Feb 11 at 17:17
1
it will take the largest between 3000 features or a random 10% of the data
– J.R
Feb 11 at 17:19
Ah! I read it wrong the first time.
– Gob Tron
Feb 11 at 17:20
@GobTron I have clarified it. It will take 3000 random features
– JGH
Feb 11 at 17:25
add a comment |
9
9
9
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.
answered Feb 11 at 17:12
JGHJGH
12.9k21139
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.
answered Feb 11 at 17:12
JGHJGH
12.9k21139
edited Feb 11 at 17:24
answered Feb 11 at 17:12
JGHJGH
12.9k21139
answered Feb 11 at 17:12
JGHJGH
12.9k21139
answered Feb 11 at 17:12
JGHJGH
12.9k21139
12.9k21139
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
Feb 11 at 17:17
1
it will take the largest between 3000 features or a random 10% of the data
– J.R
Feb 11 at 17:19
Ah! I read it wrong the first time.
– Gob Tron
Feb 11 at 17:20
@GobTron I have clarified it. It will take 3000 random features
– JGH
Feb 11 at 17:25
add a comment |
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
Feb 11 at 17:17
1
it will take the largest between 3000 features or a random 10% of the data
– J.R
Feb 11 at 17:19
Ah! I read it wrong the first time.
– Gob Tron
Feb 11 at 17:20
@GobTron I have clarified it. It will take 3000 random features
– JGH
Feb 11 at 17:25
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
Feb 11 at 17:17
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
Feb 11 at 17:17
1
1
it will take the largest between 3000 features or a random 10% of the data
– J.R
Feb 11 at 17:19
it will take the largest between 3000 features or a random 10% of the data
– J.R
Feb 11 at 17:19
Ah! I read it wrong the first time.
– Gob Tron
Feb 11 at 17:20
Ah! I read it wrong the first time.
– Gob Tron
Feb 11 at 17:20
@GobTron I have clarified it. It will take 3000 random features
– JGH
Feb 11 at 17:25
@GobTron I have clarified it. It will take 3000 random features
– JGH
Feb 11 at 17:25
add a comment |
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I can't reproduce this on Ubuntu 18.04, 3.4.4-Madeira - can you add operating system and qgis version
– Ian Turton♦
Feb 11 at 16:54
See Edit 1 for the info
– Gob Tron
Feb 11 at 16:57
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
Feb 11 at 17:02
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
Feb 11 at 17:03
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
Feb 11 at 17:11