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5

I am new in QGIS, and I can't quite figure out how grid and scale work. Should my "Project CRS" and my "Grid CRS" be the same or not?

I played around with settings and after some time and managed to get what I think is correct grid (based on some comparison on existing maps). But still, I'm not sure how to set it up on other maps I plan to make and Google isn't helping.

My problem is - my scale is now off. For example, I know that distance from Zagreb to Sisak is around 50km, and based on my map it says around 70/80. Some other examples are even more extreme. What is the problem? Why is my scale now working?

I georeferenced my image perfectly - it matches with the OpenStreetMap layer beneath perfectly - but my scale is still off. Projection is World Mercator.

qgis coordinate-system qgis-3

share|improve this question

edited 55 mins ago

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5

I am new in QGIS, and I can't quite figure out how grid and scale work. Should my "Project CRS" and my "Grid CRS" be the same or not?

I played around with settings and after some time and managed to get what I think is correct grid (based on some comparison on existing maps). But still, I'm not sure how to set it up on other maps I plan to make and Google isn't helping.

My problem is - my scale is now off. For example, I know that distance from Zagreb to Sisak is around 50km, and based on my map it says around 70/80. Some other examples are even more extreme. What is the problem? Why is my scale now working?

I georeferenced my image perfectly - it matches with the OpenStreetMap layer beneath perfectly - but my scale is still off. Projection is World Mercator.

qgis coordinate-system qgis-3

share|improve this question

edited 55 mins ago

Taras

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asked 8 hours ago

Filip FrankopanFilip Frankopan

2611 bronze badge

New contributor

Filip Frankopan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I am new in QGIS, and I can't quite figure out how grid and scale work. Should my "Project CRS" and my "Grid CRS" be the same or not?

I played around with settings and after some time and managed to get what I think is correct grid (based on some comparison on existing maps). But still, I'm not sure how to set it up on other maps I plan to make and Google isn't helping.

My problem is - my scale is now off. For example, I know that distance from Zagreb to Sisak is around 50km, and based on my map it says around 70/80. Some other examples are even more extreme. What is the problem? Why is my scale now working?

I georeferenced my image perfectly - it matches with the OpenStreetMap layer beneath perfectly - but my scale is still off. Projection is World Mercator.

qgis coordinate-system qgis-3

share|improve this question

edited 55 mins ago

Taras

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asked 8 hours ago

Filip FrankopanFilip Frankopan

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Filip Frankopan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 55 mins ago

Taras

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asked 8 hours ago

Filip FrankopanFilip Frankopan

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Filip Frankopan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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edited 55 mins ago

Taras

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edited 55 mins ago

Taras

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edited 55 mins ago

Taras

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6

The difference in results is because of the properties of the Mercator projection. With Mercator, the measurements will only provide reliable results on the vertical (longitude) axis, not horizontal (latitude).

If you need to measure distances on your map, you should choose another projection.

I would suggest the following projections that can be used to measure distance in your region of interest (in no particular order):

1. Bonne


2. Equidistant conic


3. Lambert conformal conic


4. Albers

I have checked and in all of them, the distance between Zagreb and Sisak is about 47 km.

As to the grid lines - yes, they should, in theory, be in the same CRS as the map, but any GIS software will reproject it on the fly for you. However, do not expect the lines to be straight vertical and horizontal - the chosen projection will dictate the orientation of latitudes and meridians.

share|improve this answer

edited 54 mins ago

Taras

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answered 8 hours ago

Mecklenburg PomeranianMecklenburg Pomeranian

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Oh, never thought about that. How is that than the world maps in Mercator projection have working scale? And what would be best projection to use if I want accurate distance on my map for this kind of scale, and also for smaller scale?
  
  – Filip Frankopan
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Wikipedia has a good introduction to map projections. Have a look at the section about Equidistant projections, and also the section called Which projection is best?
  
  – csk
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Tnq! Will look into it. And what about grids? Do I always use WGS 1984 (EPSG:4326) CRS, or do my map CRS and grid CRS must be same?
  
  – Filip Frankopan
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Equidistant projections (contrary to their name) do not provide least distortions in measuring distances. The distortion is 0 between the 'focal points' of the projection, but it can be significantly higher in other places on the map. [This link] (observablehq.com/@toja/five-map-projections-for-europe) explains about several traditionally used projections for your region. I will them to the answer.
  
  – Mecklenburg Pomeranian
  7 hours ago
  

  
  
  
  

add a comment | 

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6

The difference in results is because of the properties of the Mercator projection. With Mercator, the measurements will only provide reliable results on the vertical (longitude) axis, not horizontal (latitude).

If you need to measure distances on your map, you should choose another projection.

I would suggest the following projections that can be used to measure distance in your region of interest (in no particular order):

1. Bonne


2. Equidistant conic


3. Lambert conformal conic


4. Albers

I have checked and in all of them, the distance between Zagreb and Sisak is about 47 km.

As to the grid lines - yes, they should, in theory, be in the same CRS as the map, but any GIS software will reproject it on the fly for you. However, do not expect the lines to be straight vertical and horizontal - the chosen projection will dictate the orientation of latitudes and meridians.

share|improve this answer

edited 54 mins ago

Taras

3,26933 gold badges99 silver badges3232 bronze badges

answered 8 hours ago

Mecklenburg PomeranianMecklenburg Pomeranian

6633 bronze badges

New contributor

Mecklenburg Pomeranian is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Oh, never thought about that. How is that than the world maps in Mercator projection have working scale? And what would be best projection to use if I want accurate distance on my map for this kind of scale, and also for smaller scale?
  
  – Filip Frankopan
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Wikipedia has a good introduction to map projections. Have a look at the section about Equidistant projections, and also the section called Which projection is best?
  
  – csk
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Tnq! Will look into it. And what about grids? Do I always use WGS 1984 (EPSG:4326) CRS, or do my map CRS and grid CRS must be same?
  
  – Filip Frankopan
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Equidistant projections (contrary to their name) do not provide least distortions in measuring distances. The distortion is 0 between the 'focal points' of the projection, but it can be significantly higher in other places on the map. [This link] (observablehq.com/@toja/five-map-projections-for-europe) explains about several traditionally used projections for your region. I will them to the answer.
  
  – Mecklenburg Pomeranian
  7 hours ago
  

  
  
  
  

add a comment | 

6

The difference in results is because of the properties of the Mercator projection. With Mercator, the measurements will only provide reliable results on the vertical (longitude) axis, not horizontal (latitude).

If you need to measure distances on your map, you should choose another projection.

I would suggest the following projections that can be used to measure distance in your region of interest (in no particular order):

1. Bonne


2. Equidistant conic


3. Lambert conformal conic


4. Albers

I have checked and in all of them, the distance between Zagreb and Sisak is about 47 km.

As to the grid lines - yes, they should, in theory, be in the same CRS as the map, but any GIS software will reproject it on the fly for you. However, do not expect the lines to be straight vertical and horizontal - the chosen projection will dictate the orientation of latitudes and meridians.

share|improve this answer

edited 54 mins ago

Taras

3,26933 gold badges99 silver badges3232 bronze badges

answered 8 hours ago

Mecklenburg PomeranianMecklenburg Pomeranian

6633 bronze badges

New contributor

Mecklenburg Pomeranian is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Oh, never thought about that. How is that than the world maps in Mercator projection have working scale? And what would be best projection to use if I want accurate distance on my map for this kind of scale, and also for smaller scale?
  
  – Filip Frankopan
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Wikipedia has a good introduction to map projections. Have a look at the section about Equidistant projections, and also the section called Which projection is best?
  
  – csk
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Tnq! Will look into it. And what about grids? Do I always use WGS 1984 (EPSG:4326) CRS, or do my map CRS and grid CRS must be same?
  
  – Filip Frankopan
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Equidistant projections (contrary to their name) do not provide least distortions in measuring distances. The distortion is 0 between the 'focal points' of the projection, but it can be significantly higher in other places on the map. [This link] (observablehq.com/@toja/five-map-projections-for-europe) explains about several traditionally used projections for your region. I will them to the answer.
  
  – Mecklenburg Pomeranian
  7 hours ago
  

  
  
  
  

add a comment | 

The difference in results is because of the properties of the Mercator projection. With Mercator, the measurements will only provide reliable results on the vertical (longitude) axis, not horizontal (latitude).

If you need to measure distances on your map, you should choose another projection.

I would suggest the following projections that can be used to measure distance in your region of interest (in no particular order):

1. Bonne


2. Equidistant conic


3. Lambert conformal conic


4. Albers

I have checked and in all of them, the distance between Zagreb and Sisak is about 47 km.

As to the grid lines - yes, they should, in theory, be in the same CRS as the map, but any GIS software will reproject it on the fly for you. However, do not expect the lines to be straight vertical and horizontal - the chosen projection will dictate the orientation of latitudes and meridians.

share|improve this answer

edited 54 mins ago

Taras

3,26933 gold badges99 silver badges3232 bronze badges

answered 8 hours ago

Mecklenburg PomeranianMecklenburg Pomeranian

6633 bronze badges

New contributor

Mecklenburg Pomeranian is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this answer

edited 54 mins ago

Taras

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answered 8 hours ago

Mecklenburg PomeranianMecklenburg Pomeranian

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New contributor

Mecklenburg Pomeranian is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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edited 54 mins ago

Taras

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edited 54 mins ago

Taras

3,26933 gold badges99 silver badges3232 bronze badges

answered 8 hours ago

Mecklenburg PomeranianMecklenburg Pomeranian

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New contributor

Mecklenburg Pomeranian is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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answered 8 hours ago

Mecklenburg PomeranianMecklenburg Pomeranian

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