Data type conversion

Revision as of 14:09, 23 October 2019

We may change the data type (and radiometric resolution) of a raster layer.

Click the Add raster layer and select a multiband file e.g. geodata/lucc/. This is multiband file with three different spectral indices created by Orfeo Toolbox --> Feature Extraction --> Radiometric Indices) with the data type Float (Check the Raster metadata). We would like to convert to data type Byte - eight bit unsigned integer, value range 0 to 255.
Click Open.
In processing toolbar, type dynamic into the search field to find the Orfeo Toolbox --> Image Manipulation --> DynamicConvert) tool.
Open with a double click. Specify the input and a new output file name as shown in the screenshot.
Set High cut quantil and Low cut quantile to 0
Click Advanced parameters and define Output pixel type uint8.
Click Run.

The output Image raster is now recoded and saved to unsigned eight bit.

@@ Line 1: / Line 1: @@
-We may change the data type (or radiometric resolution) of a raster layer.
+We may change the data type (and radiometric resolution) of a raster layer.
-# Click the {{button|text=Add raster layer}} [[Image:QGIS_2.0_addrast.png|20px]] and select a single band or a multiband file e.g. ''geodata/lucc/''. This is multiband file with three different spectral indices created by {{button|text=Orfeo Toolbox --> Feature Extraction --> Radiometric Indices)}} with the data type '''Float''' (Check the [[Raster metadata]]). We would like to convert to data type '''Byte - eight bit unsigned integer''',  value range 0 to 255.
+# Click the {{button|text=Add raster layer}} [[Image:QGIS_2.0_addrast.png|20px]] and select a multiband file e.g. ''geodata/lucc/''. This is multiband file with three different spectral indices created by {{button|text=Orfeo Toolbox --> Feature Extraction --> Radiometric Indices)}} with the data type '''Float''' (Check the [[Raster metadata]]). We would like to convert to data type '''Byte - eight bit unsigned integer''',  value range 0 to 255.
 # Click {{button|text=Open}}.
 # In processing toolbar, type {{typed|text=dynamic}} into the search field to find the {{button|text=Orfeo Toolbox --> Image Manipulation --> DynamicConvert)}} tool.