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I am user QGIS and I use composer and atlas to create my maps exports print. in the atlas settings I use for scale 20% margin but now I need to print in specific scale numbers.for example if my atlas feature scale where i use scale 20% margin is the scale is between 100 and 200 then I need to take scale 200. if the scale is between 1500-2000 then I need to take 2000 scale.

any idea how to do this ?with some condition ?

summary I want to avoid to print features with scales like this 10006 or 12221 I need to print in scales with specific numbers like 10000 or 15000 or 100 or 200.

atlas

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Check 'Predefinded scale' in your image.
This option will automatically choose the best fitting predefined scale to show the whole atlas feature.

You can define these scales under:
project > project propertries > general > check project scales > click '+' and enter a denominator.

You can set as many scales as you want. You can also create a XML-file of a set of predefined scales for usage in other projects of yours

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  • that is a good in the some features i loose the 20%margin i need that in the some features maybe to have 1% or 2% is to small margin
    – jessie jes
    Commented Sep 22, 2017 at 21:44
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    You could use a hidden coverage layer that's a copy of your feature layer with a buffer to get the desired minimum margin.
    – Iamlukesky
    Commented Dec 6, 2017 at 9:57
  • @Iamlukesky || this would probably push your feature into the next scale category. If this equals to a 20% margin depends on the presets.
    – Nightwatch
    Commented Dec 8, 2017 at 9:40

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