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Difference between units in QGIS: Map Unit vs. Millimeter vs. Inch vs. Pixel vs. Point

How map unit affects the caption size in the label in Qgis?Changing units project wide from 'Millimeter' to 'Map Units'Adjusting flow map styles in QGIS: Varying buffers' sizesUnderstanding QGIS buffer tool units?Key for a Heat MapDifference between Feature and GeometryWhich system of units does the unit 'degree' belong to?Conversion between semicircles and latitude unitsQGIS Units and ScaleArea units for output polygon in WGS 84 UTM Zone 32N using QGISShortening line geometry using expression dialog in QGIS?QGIS Shapefile - Units/Editing ShapefileAdjusting flow map styles in QGIS: Varying buffers' sizes

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While modifying some geometries in QGIS in my previous question Adjusting flow map styles in QGIS: Varying buffers' sizes I ended up with a huge confusion regarding the dimensions/units that QGIS works with.

---

General Question

What is the difference between main Units in QGIS, i.e. Map Unit, Millimeter, Pixel, Inch, Point and their visualization behaviour on the map? Does any kind of relations exist between those five? Is there any kind of ratio?

---

Example-based Question

For instance, I do have a point layer that responds to my visualization purposes, units are Millimeters.

Points are visualized with Graduated symbols using the following specifications. 6 groups, sizes from 1 to 6 Millimeters.

But when I apply Map units the visualization aspect changes dramatically. Those points are visible only at large map scales and cannot be viewed at the same map scale that used for the image above. As I should, I am working with projected CRS, where units are Meters.

How to convert the dimensions into Units or Pixels to be able to deploy Geometry Generator on the next step and at the same time maintain the visualization aspect? How should I adjust the parameters of my points?

Because when I want to use this point layer in the Geometry Generator (i.e. start_point() and end_point()) I have to have Map Units. Am I correctly understand that geometry Generator works only with Map Units, or?

---

References:

• Changing units project wide from 'Millimeter' to 'Map Units'


• Documentation for QGIS 2.18 | The Symbol Library | Configuring a symbol


• How map unit affects the caption size in the label in Qgis?

qgis units geometry-generator

share|improve this question

edited 4 mins ago

Taras

asked 32 mins ago

TarasTaras

2,1372725

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  There are also points and inches units in QGIS 3.6
  
  – ahmadhanb
  16 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Perfect let's extend it!
  
  – Taras
  13 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Geometry generator should work with mm, too. Unless you want to cover the exact geometric distance between two features, then you have to use map units. You could, however, scale your proportional point data by say 1/10, or even logarithmic.
  
  – Erik
  4 mins ago
  

  
  
  
  

add a comment | 

1

1

While modifying some geometries in QGIS in my previous question Adjusting flow map styles in QGIS: Varying buffers' sizes I ended up with a huge confusion regarding the dimensions/units that QGIS works with.

---

General Question

What is the difference between main Units in QGIS, i.e. Map Unit, Millimeter, Pixel, Inch, Point and their visualization behaviour on the map? Does any kind of relations exist between those five? Is there any kind of ratio?

---

Example-based Question

For instance, I do have a point layer that responds to my visualization purposes, units are Millimeters.

Points are visualized with Graduated symbols using the following specifications. 6 groups, sizes from 1 to 6 Millimeters.

But when I apply Map units the visualization aspect changes dramatically. Those points are visible only at large map scales and cannot be viewed at the same map scale that used for the image above. As I should, I am working with projected CRS, where units are Meters.

How to convert the dimensions into Units or Pixels to be able to deploy Geometry Generator on the next step and at the same time maintain the visualization aspect? How should I adjust the parameters of my points?

Because when I want to use this point layer in the Geometry Generator (i.e. start_point() and end_point()) I have to have Map Units. Am I correctly understand that geometry Generator works only with Map Units, or?

---

References:

• Changing units project wide from 'Millimeter' to 'Map Units'


• Documentation for QGIS 2.18 | The Symbol Library | Configuring a symbol


• How map unit affects the caption size in the label in Qgis?

qgis units geometry-generator

share|improve this question

edited 4 mins ago

Taras

asked 32 mins ago

TarasTaras

2,1372725

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  There are also points and inches units in QGIS 3.6
  
  – ahmadhanb
  16 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Perfect let's extend it!
  
  – Taras
  13 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Geometry generator should work with mm, too. Unless you want to cover the exact geometric distance between two features, then you have to use map units. You could, however, scale your proportional point data by say 1/10, or even logarithmic.
  
  – Erik
  4 mins ago
  

  
  
  
  

add a comment | 

While modifying some geometries in QGIS in my previous question Adjusting flow map styles in QGIS: Varying buffers' sizes I ended up with a huge confusion regarding the dimensions/units that QGIS works with.

---

General Question

What is the difference between main Units in QGIS, i.e. Map Unit, Millimeter, Pixel, Inch, Point and their visualization behaviour on the map? Does any kind of relations exist between those five? Is there any kind of ratio?

---

Example-based Question

For instance, I do have a point layer that responds to my visualization purposes, units are Millimeters.

Points are visualized with Graduated symbols using the following specifications. 6 groups, sizes from 1 to 6 Millimeters.

But when I apply Map units the visualization aspect changes dramatically. Those points are visible only at large map scales and cannot be viewed at the same map scale that used for the image above. As I should, I am working with projected CRS, where units are Meters.

How to convert the dimensions into Units or Pixels to be able to deploy Geometry Generator on the next step and at the same time maintain the visualization aspect? How should I adjust the parameters of my points?

Because when I want to use this point layer in the Geometry Generator (i.e. start_point() and end_point()) I have to have Map Units. Am I correctly understand that geometry Generator works only with Map Units, or?

---

References:

• Changing units project wide from 'Millimeter' to 'Map Units'


• Documentation for QGIS 2.18 | The Symbol Library | Configuring a symbol


• How map unit affects the caption size in the label in Qgis?

qgis units geometry-generator

share|improve this question

edited 4 mins ago

Taras

asked 32 mins ago

TarasTaras

2,1372725

share|improve this question

edited 4 mins ago

Taras

asked 32 mins ago

TarasTaras

2,1372725

share|improve this question

edited 4 mins ago

Taras

asked 32 mins ago

TarasTaras

2,1372725

asked 32 mins ago

TarasTaras

2,1372725

asked 32 mins ago

TarasTaras

2,1372725