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Trying to merge 2 vector layers; one is of type "LineStingZ", the other is just "LineString". When I run the merge algorithm I get the message saying "Error executing algorithm Merge vector layers All layers must have same geometry type!"; but when I try to do a save-as on the LineString layer and check the 'Include z-dimension' I get a new "LineStringZM" type and they still don't match. Is there another way to specify the layer type?

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You should be able to use the MMQGIS plugin to convert your LineStringZ layer to LineString. From the MMQGIS menu go to Modify > Convert Geometry Type. Select your LineStringZ layer as the source layer and new geometry type as lines.

EDIT: As pointed out by @Alexandre Neto, in QGIS 2.18, Convert geometry type is available from the processing toolbox under QGIS geoalgorithms > Vector geometry tools.

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    In QGIS 2.18 you don't need MMQGIS plugin for that. the Convert Geometry type is available on the Processing toolbox. – Alexandre Neto Nov 29 '17 at 2:31
  • You're right @Alexandre Neto- I hadn't noticed that. Under QGIS geoalgorithms > Vector geometry tools. – Ben W Nov 29 '17 at 3:07
  • Thanks - that works. Also works just by doing a 'save as' and changing the geometry type from Automatic to LineSting and unchecking the 'Include Z-dimension'. So to solve the issue in the end, I had to change the LineStingZ layer to LineString, I couldn't do it the other way around without getting the ZM LineSting type. Thanks for the help! – CEL-ma Nov 29 '17 at 13:23

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