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QGIS Zanzibar how to crop?

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3

1

I have georeferenced an old OS map and I have now imported the OS data shapefile for boundaries for England. How can I get rid of the extra data that extends beyond my map and just leave my scanned map with the boundary layer?

This is a screenshot of what it looks like.

qgis qgis-3 clip

share|improve this question

edited 7 hours ago

lambertj

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asked 9 hours ago

GideonswayGideonsway

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add a comment | 

3

1

I have georeferenced an old OS map and I have now imported the OS data shapefile for boundaries for England. How can I get rid of the extra data that extends beyond my map and just leave my scanned map with the boundary layer?

This is a screenshot of what it looks like.

qgis qgis-3 clip

share|improve this question

edited 7 hours ago

lambertj

1,97511 gold badge66 silver badges2323 bronze badges

asked 9 hours ago

GideonswayGideonsway

4222 bronze badges

add a comment | 

I have georeferenced an old OS map and I have now imported the OS data shapefile for boundaries for England. How can I get rid of the extra data that extends beyond my map and just leave my scanned map with the boundary layer?

This is a screenshot of what it looks like.

qgis qgis-3 clip

share|improve this question

edited 7 hours ago

lambertj

1,97511 gold badge66 silver badges2323 bronze badges

asked 9 hours ago

GideonswayGideonsway

4222 bronze badges

share|improve this question

edited 7 hours ago

lambertj

1,97511 gold badge66 silver badges2323 bronze badges

asked 9 hours ago

GideonswayGideonsway

4222 bronze badges

share|improve this question

edited 7 hours ago

lambertj

1,97511 gold badge66 silver badges2323 bronze badges

asked 9 hours ago

GideonswayGideonsway

4222 bronze badges

edited 7 hours ago

lambertj

1,97511 gold badge66 silver badges2323 bronze badges

edited 7 hours ago

lambertj

1,97511 gold badge66 silver badges2323 bronze badges

asked 9 hours ago

GideonswayGideonsway

4222 bronze badges

asked 9 hours ago

GideonswayGideonsway

4222 bronze badges

2 Answers
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4

Using the Vector Overlay->Extract/clip by extent tool in the processing toolbox will produce almost what you want:

But as you can see you get the bounding box not the actual boundary of the raster. I had hoped you could use the Vector geometry->Minimum bounding geometry but that only works on vector layers.

So if you must have the exact matching boundary you will need to create a scratch polygon layer and add the bounding polygon by hand and use that in the clip operation.

share|improve this answer

answered 8 hours ago

Ian Turton♦Ian Turton

52.3k55 gold badges4848 silver badges121121 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks Ian I will try that - but can you also explain what a "scratch polygon layer" and what you mean by adding "the bounding polygon by hand"? I know this is probably a dumb question, but why isn't there simply a cropping tool as per photoshop? (I assume that "clip" is a QGIS/GIS term for crop?) Thanks.
  
  – Gideonsway
  7 hours ago
  

  
  
  
  

add a comment | 

3

You cannot clip a vector layer with a raster layer, so do the following

1. Use Processing Toolbox > Layer Tools > Extract layer extent for the scanned map layer.


2. Now you can use Processing Toolbox > Vector overlay > Clip and choose the OS data shapefile as Input layer and the extent layer generated in Step 1 as the Overlay layer.

share|improve this answer

answered 8 hours ago

spatialthoughtsspatialthoughts

3,8781515 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi I did as you suggested re 1 above and used processing toolbox>layer tools>Extract Layer extent on the scanned map and get this error message "files are not supported by this algorithm" Not sure how to proceed. It feels as if this should be such a routine and easy thing to accomplish as per crop in photoshop. Any thoughts please?
  
  – Gideonsway
  7 hours ago
  

  
  
  
  

add a comment | 

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4

Using the Vector Overlay->Extract/clip by extent tool in the processing toolbox will produce almost what you want:

But as you can see you get the bounding box not the actual boundary of the raster. I had hoped you could use the Vector geometry->Minimum bounding geometry but that only works on vector layers.

So if you must have the exact matching boundary you will need to create a scratch polygon layer and add the bounding polygon by hand and use that in the clip operation.

share|improve this answer

answered 8 hours ago

Ian Turton♦Ian Turton

52.3k55 gold badges4848 silver badges121121 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks Ian I will try that - but can you also explain what a "scratch polygon layer" and what you mean by adding "the bounding polygon by hand"? I know this is probably a dumb question, but why isn't there simply a cropping tool as per photoshop? (I assume that "clip" is a QGIS/GIS term for crop?) Thanks.
  
  – Gideonsway
  7 hours ago
  

  
  
  
  

add a comment | 

4

Using the Vector Overlay->Extract/clip by extent tool in the processing toolbox will produce almost what you want:

But as you can see you get the bounding box not the actual boundary of the raster. I had hoped you could use the Vector geometry->Minimum bounding geometry but that only works on vector layers.

So if you must have the exact matching boundary you will need to create a scratch polygon layer and add the bounding polygon by hand and use that in the clip operation.

share|improve this answer

answered 8 hours ago

Ian Turton♦Ian Turton

52.3k55 gold badges4848 silver badges121121 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks Ian I will try that - but can you also explain what a "scratch polygon layer" and what you mean by adding "the bounding polygon by hand"? I know this is probably a dumb question, but why isn't there simply a cropping tool as per photoshop? (I assume that "clip" is a QGIS/GIS term for crop?) Thanks.
  
  – Gideonsway
  7 hours ago
  

  
  
  
  

add a comment | 

Using the Vector Overlay->Extract/clip by extent tool in the processing toolbox will produce almost what you want:

But as you can see you get the bounding box not the actual boundary of the raster. I had hoped you could use the Vector geometry->Minimum bounding geometry but that only works on vector layers.

So if you must have the exact matching boundary you will need to create a scratch polygon layer and add the bounding polygon by hand and use that in the clip operation.

share|improve this answer

answered 8 hours ago

Ian Turton♦Ian Turton

52.3k55 gold badges4848 silver badges121121 bronze badges

share|improve this answer

answered 8 hours ago

Ian Turton♦Ian Turton

52.3k55 gold badges4848 silver badges121121 bronze badges

answered 8 hours ago

Ian Turton♦Ian Turton

52.3k55 gold badges4848 silver badges121121 bronze badges

answered 8 hours ago

Ian Turton♦Ian Turton

52.3k55 gold badges4848 silver badges121121 bronze badges

3

You cannot clip a vector layer with a raster layer, so do the following

1. Use Processing Toolbox > Layer Tools > Extract layer extent for the scanned map layer.


2. Now you can use Processing Toolbox > Vector overlay > Clip and choose the OS data shapefile as Input layer and the extent layer generated in Step 1 as the Overlay layer.

share|improve this answer

answered 8 hours ago

spatialthoughtsspatialthoughts

3,8781515 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi I did as you suggested re 1 above and used processing toolbox>layer tools>Extract Layer extent on the scanned map and get this error message "files are not supported by this algorithm" Not sure how to proceed. It feels as if this should be such a routine and easy thing to accomplish as per crop in photoshop. Any thoughts please?
  
  – Gideonsway
  7 hours ago
  

  
  
  
  

add a comment | 

3

You cannot clip a vector layer with a raster layer, so do the following

1. Use Processing Toolbox > Layer Tools > Extract layer extent for the scanned map layer.


2. Now you can use Processing Toolbox > Vector overlay > Clip and choose the OS data shapefile as Input layer and the extent layer generated in Step 1 as the Overlay layer.

share|improve this answer

answered 8 hours ago

spatialthoughtsspatialthoughts

3,8781515 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi I did as you suggested re 1 above and used processing toolbox>layer tools>Extract Layer extent on the scanned map and get this error message "files are not supported by this algorithm" Not sure how to proceed. It feels as if this should be such a routine and easy thing to accomplish as per crop in photoshop. Any thoughts please?
  
  – Gideonsway
  7 hours ago
  

  
  
  
  

add a comment | 

You cannot clip a vector layer with a raster layer, so do the following

1. Use Processing Toolbox > Layer Tools > Extract layer extent for the scanned map layer.


2. Now you can use Processing Toolbox > Vector overlay > Clip and choose the OS data shapefile as Input layer and the extent layer generated in Step 1 as the Overlay layer.

share|improve this answer

answered 8 hours ago

spatialthoughtsspatialthoughts

3,8781515 silver badges2727 bronze badges

share|improve this answer

answered 8 hours ago

spatialthoughtsspatialthoughts

3,8781515 silver badges2727 bronze badges

answered 8 hours ago

spatialthoughtsspatialthoughts

3,8781515 silver badges2727 bronze badges

answered 8 hours ago

spatialthoughtsspatialthoughts

3,8781515 silver badges2727 bronze badges