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Why is raster boundary rectangular, not buffer?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

1

First, I took very few points and did IDW and i got a circular boundary raster. This is because of the search radius i applied. If that is the case, for large number of points, the raster must look like a buffer, with the buffer width of search radius. Instead, the edges are rectangular. Why is it so? I didn't find an answer in any previous post.

raster qgis-3 inverse-distance-weighted

share|improve this question

edited Apr 10 at 9:13

BERA

17.2k62044

asked Apr 10 at 9:03

sudheeshsudheesh

218

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm using QGIS 3.2.2.
  
  – sudheesh
  Apr 10 at 9:13
  

  
  
  
  

add a comment | 

1

First, I took very few points and did IDW and i got a circular boundary raster. This is because of the search radius i applied. If that is the case, for large number of points, the raster must look like a buffer, with the buffer width of search radius. Instead, the edges are rectangular. Why is it so? I didn't find an answer in any previous post.

raster qgis-3 inverse-distance-weighted

share|improve this question

edited Apr 10 at 9:13

BERA

17.2k62044

asked Apr 10 at 9:03

sudheeshsudheesh

218

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm using QGIS 3.2.2.
  
  – sudheesh
  Apr 10 at 9:13
  

  
  
  
  

add a comment | 

First, I took very few points and did IDW and i got a circular boundary raster. This is because of the search radius i applied. If that is the case, for large number of points, the raster must look like a buffer, with the buffer width of search radius. Instead, the edges are rectangular. Why is it so? I didn't find an answer in any previous post.

raster qgis-3 inverse-distance-weighted

share|improve this question

edited Apr 10 at 9:13

BERA

17.2k62044

asked Apr 10 at 9:03

sudheeshsudheesh

218

share|improve this question

edited Apr 10 at 9:13

BERA

17.2k62044

asked Apr 10 at 9:03

sudheeshsudheesh

218

share|improve this question

edited Apr 10 at 9:13

BERA

17.2k62044

asked Apr 10 at 9:03

sudheeshsudheesh

218

edited Apr 10 at 9:13

BERA

17.2k62044

edited Apr 10 at 9:13

BERA

17.2k62044

asked Apr 10 at 9:03

sudheeshsudheesh

218

asked Apr 10 at 9:03

sudheeshsudheesh

218

1 Answer
1

active

oldest

votes

1

A raster, by definition, is a rectangular grid of pixels, and pixels are in the shape of squares. These pixels are organised into rows and columns whereas all rows have an equal amount of pixels. So no matter what shape you buffer into a raster, you will end up with a rectangular shape. What will change is the value of the pixel, where in the image you shared, you see pixels with varying tones of white to black. The variation in colour here is a representation of the value of each pixel according to a colour scale you choose.

share|improve this answer

answered Apr 10 at 9:40

Techie_GusTechie_Gus

1,380612

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I feel the same. The pixel size has changed drastically when i used more number of points. Thanks
  
  – sudheesh
  Apr 10 at 9:42
  

  
  
  
  

add a comment | 

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1

A raster, by definition, is a rectangular grid of pixels, and pixels are in the shape of squares. These pixels are organised into rows and columns whereas all rows have an equal amount of pixels. So no matter what shape you buffer into a raster, you will end up with a rectangular shape. What will change is the value of the pixel, where in the image you shared, you see pixels with varying tones of white to black. The variation in colour here is a representation of the value of each pixel according to a colour scale you choose.

share|improve this answer

answered Apr 10 at 9:40

Techie_GusTechie_Gus

1,380612

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I feel the same. The pixel size has changed drastically when i used more number of points. Thanks
  
  – sudheesh
  Apr 10 at 9:42
  

  
  
  
  

add a comment | 

1

A raster, by definition, is a rectangular grid of pixels, and pixels are in the shape of squares. These pixels are organised into rows and columns whereas all rows have an equal amount of pixels. So no matter what shape you buffer into a raster, you will end up with a rectangular shape. What will change is the value of the pixel, where in the image you shared, you see pixels with varying tones of white to black. The variation in colour here is a representation of the value of each pixel according to a colour scale you choose.

share|improve this answer

answered Apr 10 at 9:40

Techie_GusTechie_Gus

1,380612

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I feel the same. The pixel size has changed drastically when i used more number of points. Thanks
  
  – sudheesh
  Apr 10 at 9:42
  

  
  
  
  

add a comment | 

A raster, by definition, is a rectangular grid of pixels, and pixels are in the shape of squares. These pixels are organised into rows and columns whereas all rows have an equal amount of pixels. So no matter what shape you buffer into a raster, you will end up with a rectangular shape. What will change is the value of the pixel, where in the image you shared, you see pixels with varying tones of white to black. The variation in colour here is a representation of the value of each pixel according to a colour scale you choose.

share|improve this answer

answered Apr 10 at 9:40

Techie_GusTechie_Gus

1,380612

share|improve this answer

answered Apr 10 at 9:40

Techie_GusTechie_Gus

1,380612

answered Apr 10 at 9:40

Techie_GusTechie_Gus

1,380612

answered Apr 10 at 9:40

Techie_GusTechie_Gus

1,380612