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

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 that QGIS works with.

---

General Question

What is the difference between main Units in QGIS, i.e. Map Unit, Millimeter, Pixel and their visualization behaviour on the map? Does any kind of relations exist between those three? 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-2 units geometry-generator

share

asked 5 mins ago

TarasTaras

2,1322725

add a comment | 

0

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 that QGIS works with.

---

General Question

What is the difference between main Units in QGIS, i.e. Map Unit, Millimeter, Pixel and their visualization behaviour on the map? Does any kind of relations exist between those three? 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-2 units geometry-generator

share

asked 5 mins ago

TarasTaras

2,1322725

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 that QGIS works with.

---

General Question

What is the difference between main Units in QGIS, i.e. Map Unit, Millimeter, Pixel and their visualization behaviour on the map? Does any kind of relations exist between those three? 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-2 units geometry-generator

share

asked 5 mins ago

TarasTaras

2,1322725

share

asked 5 mins ago

TarasTaras

2,1322725

share

asked 5 mins ago

TarasTaras

2,1322725

asked 5 mins ago

TarasTaras

2,1322725

asked 5 mins ago

TarasTaras

2,1322725