Split stack

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(→‎Using OTB SplitImage)
 
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# Click the {{button|text=Add raster layer}} [[Image:QGIS_2.0_addrast.png|20px]] and select the file ''C:/OSGeo4W64/geodata/raster/s2/Subset_S2A_MSIL2A_20170619T.tif''.
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=Using OTB SplitImage=
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# After clicking {{button|text=Open}}, the raster layer appears on the QGIS canvas.
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# Click the {{button|text=Open Data Source Manager}} [[Image:QGIS_3.0_datasource.png|30px]] and then {{button|text=Add raster layer}} [[Image:QGIS_2.0_addrast.png|20px]] and select  a multiband raster file.
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# Click {{mitem|text=Processing --> Options}}. Unfold the '''General''' folder. Switch the checkbox on: '''Keep dialog open after running an algorithm.'''  
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# In  processing toolbox, type {{typed|text=split image}} into the search field to find the {{button|text=OTB --> Image Manipulation --> SplitImage}} tool and open it.
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# In the processing toolbar, type {{typed|text=Translate}} into the search field to find the {{button|text=GDAL\OGR --> Translate (Convert format)}} tool and open it.
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[[File:qgis-otb-splitimage.png|500px]]
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** Unfold the '''Advanced parameters''' and change the output data format to unsigned 16bit integer): {{typed|text=-ot UInt16}}
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** Click the button {{button|text=...}} of '''Converted''' to select path and name of output file.
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Choose the same ''Output pixel type'' like the input pixel type: here it is {{typed|text=uint16}}.
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** Type in the textbox '''Additional creation parameters''': {{typed|text=-b 1}}
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( This selects only the first band).
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'''Important''': choose a physical output file: {{button|text=Save to file}}. Specify a file name with the extension '''.tif'''
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** Click {{button|text=Run}}.
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Uncheck "Open output file after running algorithm". Open the output files manually in QGIS.
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=Using GDAL Translate=
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* In the processing toolbar, type {{typed|text=Translate}} into the search field to find the {{button|text=GDAL\OGR --> Translate (Convert format)}} tool and open it.
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* Change the output data format to unsigned 16bit integer): {{typed|text=-ot UInt16}}
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* Click the button {{button|text=...}} of '''Converted''' to select path and name of output file.
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[[File:Qgis_split_stack.png|600px]]
 
[[File:Qgis_split_stack.png|600px]]
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** Repeat the steps for other bands: change the name of the output file and edit the -b option accordingly.
 
  
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# Create a multiband file with a spectral subset of 4 bands. Change the output file and the additional creation options:  
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* Open the the OSGEO4W Shell. {{mitem|text=Start --> All Programs --> OSGeo4W --> OSGeo4W Shell}}
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** '''Converted''' output file:{{typed|text=Subset_S2A_MSIL2A_20170619T_B02030408.tif}}
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* Copy the content of the ''GDL/OGR console call'' and paste it into the OSGeo4W Shell.
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* Edit the command in OSGeo4W Shell by adding the option {{typed|text=-b 1}} to output only the first band.
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* Press {{button|text=Enter}} to execute the command in OSGeo4W Shell.
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* Repeat the steps for other bands: change the output file name and edit the -b option accordingly.
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* Create a multiband file with a spectral subset of 4 bands. Change the output file name and edit the command in OSGeo4W Shell additional creation options:  
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**'''Converted''' output file:{{typed|text=Subset_S2A_MSIL2A_20170619T_B02-
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-B03-B04-B08.tif}}
 
** '''Additional creation parameters:''' {{typed|text=-b 2 -b 3 -b 4 -b 8}}
 
** '''Additional creation parameters:''' {{typed|text=-b 2 -b 3 -b 4 -b 8}}
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** Click {{button|text=Run}}.
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** Press {{button|text=Enter}} to execute the command in OSGeo4W Shell.
  
 
[[Category:Working with Raster Data]]
 
[[Category:Working with Raster Data]]

Latest revision as of 10:56, 23 May 2022

[edit] Using OTB SplitImage

  1. Click the Open Data Source Manager QGIS 3.0 datasource.png and then Add raster layer QGIS 2.0 addrast.png and select a multiband raster file.
  2. In processing toolbox, type split image into the search field to find the OTB --> Image Manipulation --> SplitImage tool and open it.

Qgis-otb-splitimage.png

Choose the same Output pixel type like the input pixel type: here it is uint16.

Important: choose a physical output file: Save to file. Specify a file name with the extension .tif Uncheck "Open output file after running algorithm". Open the output files manually in QGIS.

[edit] Using GDAL Translate

  • In the processing toolbar, type Translate into the search field to find the GDAL\OGR --> Translate (Convert format) tool and open it.
  • Change the output data format to unsigned 16bit integer): -ot UInt16
  • Click the button ... of Converted to select path and name of output file.

Qgis split stack.png

  • Open the the OSGEO4W Shell. Start --> All Programs --> OSGeo4W --> OSGeo4W Shell
  • Copy the content of the GDL/OGR console call and paste it into the OSGeo4W Shell.
  • Edit the command in OSGeo4W Shell by adding the option -b 1 to output only the first band.
  • Press Enter to execute the command in OSGeo4W Shell.
  • Repeat the steps for other bands: change the output file name and edit the -b option accordingly.
  • Create a multiband file with a spectral subset of 4 bands. Change the output file name and edit the command in OSGeo4W Shell additional creation options:
    • Converted output file:Subset_S2A_MSIL2A_20170619T_B02-

-B03-B04-B08.tif

    • Additional creation parameters: -b 2 -b 3 -b 4 -b 8
    • Press Enter to execute the command in OSGeo4W Shell.
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