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Reclassification

This tab allows for the reclassification (i.e. assigning a new class code to raster pixels). In particular, it eases the conversion from C ID to MC ID values.

This tool supports virtual raster output; if the output file name ends with .vrt then the output is created as virtual raster composed of as many .tif files as the number of CPU threads defined in :ref:`system_processing`; for large rasters this can speed up the process.

Tip

Information about APIs of this tool in Remotior Sensus at this link .

Cross classification

Tool symbol and name Description
:guilabel:`Select the classification` input_list select a classification raster (already loaded in QGIS)
reload refresh layer list

Values

Tool symbol and name Description
checkbox :guilabel:`calculate C ID to MC ID values` if checked, the reclassification table is filled according to the :ref:`ROI_list` when :guilabel:`Calculate unique values` enter is clicked
:guilabel:`Calculate unique values` enter calculate unique values in the classification and fill the reclassification table
:guilabel:`Incremental new values` enter calculate a new incremental value (e.g. 1, 2, 3, ...) for every old value and fill the reclassification table
add add a row to the table
remove remove highlighted rows from the table
import import rules from a text file .csv separated by comma having the following structure Old_value,New_value (where Old_value cam be also an expression and New_value is an integer value) for instance:: raster < 1,1 (raster > 1) & (raster < 3),2 raster < 3,3
export export the reclassification table to a text file (.csv) that can be imported later

The reclassification table is structured with the following fields.

Old value New value
value or expression defining old values to be reclassified integer value for the corresponding Old value

Old value can be a value or an expressions defined using the variable name raster (custom names can be defined in :ref:`variable_name` ), following Python operators (e.g.:

  • raster > 3 select all pixels having value > 3 ;
  • (raster > 5) | (raster < 2) select all pixels having value > 5 or < 2 ;
  • (raster >= 2) & (raster <= 5) select all pixel values between 2 and 5.

Symbology

Tool symbol and name Description
checkbox :guilabel:`Use code from Signature list` input_list
if checked, color and class information are defined from :ref:`ROI_list`:
  • MC ID: use the ID of macroclasses
  • C ID: use the ID of classes

Run

Tool symbol and name Description
:guilabel:`Script` script_tool add this function to the :ref:`script_tab`
:guilabel:`RUN` run run this function