Is it somehow possible to convert a QGIS 2.x processing model (*.model) to a *.model3 so i can run them in QGIS 3.0 without having to redo mine from scratch?


I fear there is no simple way to convert geoprocessing models from QGIS 2 to 3. Simply converting it from json to xml can be done with services like http://www.utilities-online.info/xmltojson/ but the structure of the result is completely different between the two versions:

Converted from QGIS 2 model json (example):

<?xml version="1.0" encoding="UTF-8" ?>

                            <default />
                            <value />
                            <exported />

QGIS 3 model (native xml)

<!DOCTYPE model>
<Option type="Map">
  <Option name="children" type="Map">
    <Option name="native:buffer_1" type="Map">
      <Option value="true" name="active" type="bool"/>
      <Option name="alg_config"/>
      <Option value="native:buffer" name="alg_id" type="QString"/>
      <Option value="Buffer" name="component_description" type="QString"/>
      <Option value="382" name="component_pos_x" type="double"/>
      <Option value="447" name="component_pos_y" type="double"/>
      <Option name="dependencies"/>
      <Option value="native:buffer_1" name="id" type="QString"/>
      <Option name="outputs" type="Map">
        <Option name="result" type="Map">
          <Option value="native:buffer_1" name="child_id" type="QString"/>
          <Option value="result" name="component_description" type="QString"/>
          <Option value="582" name="component_pos_x" type="double"/>
          <Option value="492" name="component_pos_y" type="double"/>
          <Option value="" name="default_value" type="Unknown"/>
          <Option value="false" name="mandatory" type="bool"/>
          <Option value="result" name="name" type="QString"/>
          <Option value="OUTPUT" name="output_name" type="QString"/>
      </Option><!DOCTYPE model>

Apart from the fact that the two structures have very little in common, the processing environment and the modeler have undergone extensive changes (additional/changed input parameters and algorithms). So my conclusion is that we have (sad but true...) to manually convert our QGIS 2 models to the new environment.

  • Sad ... Is that still the last word or is there a solution now? – MAP Oct 15 '18 at 7:11
  • @MAP apparently it is. so i redid mine of which i had just four at that time anyways. For that one large model which actually made me post the question i used a 2.14 installation on a spare machine. An automated conversion might still come in handy for others but i assume that since it wasn't that much of a hustle for me as expected initially the demand is not high enough. – maxwhere Dec 18 '18 at 15:21

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