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I've imported several shapefiles which where exported from an Mapinfo .tab. Several tab files are imported resulting in 20+ layers. Afterwards I want to export it to geoJSON; but I'm reluctant for selecting each layer and exporting it.

Is there a way to merge all the layers to one using QGIS?

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All these functions can be accessed via the Sextante plugin, also in Lisboa –  user20470 Jul 26 '13 at 8:59
    
yes, the tools works perfectly. Just if the input shapefiles are in UTF8, the output shapefile lose atributes.... is there any way to say QGIS to create SHP in UTF8 ? something like in ArcGIS, where you can in registry set the value defaul codepage to UTF8? –  user22228 Sep 23 '13 at 10:11

3 Answers 3

up vote 19 down vote accepted

you can use MMqgis tools for merging...

mmqgis

The merge layers tool merges features from multiple layers into a single shapefile and adds the merged shapefile to the project. One or more layers are selected from the "Select Source Layers" dialog list box and an output shapefile name is specified in the "Output Shapefile" dialog field.

Merged layers must all be the same geometry type (point, polygon, etc.). If the source layers have different attribute fields (distinguished by name and type), the merged file will contain a set of all different fields from the source layers with NULL values inserted when a source layer does not have a specific output field.

i hope it helps you...

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Thanks this was very helpful.. I wonder why this is not core in QGIS?? best –  user9224 Jul 31 '12 at 6:48
    
you're welcome. i think what u think... –  Aragon Jul 31 '12 at 8:18
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There is such an option, under the vector menu, data management tool –  Paulo Aug 1 '12 at 7:56

MMgis was found under the 'Plugins' Menu in QGIS 1.8.0 Lisboa. Just in case people do not find it under the 'Vector' menu. I am not sure it this can be changed by the user.

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You can use the 'merge shapefiles to one' function under the menu vector|Data management tool. You can merge all files in the input directory or select specific files in the input directory.

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The same applies as for MMqgis tool: merged layers must all be of the same geometry type. Also, if the source layers have different attributes fields, the merged file will contain all fields, but with NULL values inserted when a source layer does not have a specific field.

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