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You only need to click OK once – Quantum may add layers twice if you hit OK twice! Click cancel to go back to your map. Navigate to your newly-created folder and select each Shapefile you wish to include (carefully if they have been re-projected) – the order in which they are added is not important.īrowse to the same folder to output the merged Shapefile and give the merged file a name – I usually include ‘merge’ somewhere in the name.Ĭhoose to add the finished merged shapefile to the canvas to confirm it has merged correctly: check the attribute table to ensure each polygon is present. Switch on the option ‘Select by layers in the folder’. In the Vector menu, Data Management Tools sub-menu, select ‘Merge shapefiles to one’. Optionally, prepare the individual layer DBF files at this stage, before merger (see DBF Preparation Stage below). The new folder should only contain the saved shapefiles you wish to merge. Once you are happy with registration, in the Layers toolbar, right click each layer and ‘Save As…’ to save a copy of each layer inside a new folder. MapWindow currently only allows the merger of 2 shapefiles so Quantum remains more efficient at merging more than 2 layers. If you are having difficulty in getting the Shapefiles to share the same projection and to register on top of each other, I usually find MapWindow is better at re-projecting layers.
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You may wish to modify the projection of your Quantum project or layers to alter the perspective of the map – you must ensure that each Shapefile you wish to merge is set to the same projection.Ĭheck the registration of your Shapefiles –they should all line up correctly at each level of detail. In Quantum GIS, start a new project and add the Shapefile polygon layers that you wish to include in your final map. You may need to experiment and test to ensure performance is sufficiently smooth for your purpose, audience and delivery method (web or file). At the highest level of detail, the model does slow down. The example I have prepared has just over 1,000 separate polygons within 4 different layers. Getting the projection of each layer of the map the same is vital. You may need to experiment to achieve a compromise between file size and quality of registration.
Shapefile simplification routines may affect the registration of individual polygons within the individual Shapefiles or the final merged shapefile. Things to bear in mind at the Shapefile preparation stage These need to be aligned correctly to each other and merged into a single Shapefile. You will need a set of polygon Shapefile layers. Attributes can also be edited directly in Quantum GIS but if extensive editing is needed, OpenOffice is to be preferred. It is possible to open DBFs in Excel 2003 and earlier but the results can be haphazard.
This allows one to selectively hide layers of map areas for which there is no data. The layered map works by making map areas with no data invisible. In a nutshell: c reating a multi-layer interactive map Prepare data for importing into StatPlanet.
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These two steps explain how to turn them into an interactive map:
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It also describes how to create an interactive layered map using StatPlanet.ĭemo with 4 map layers Download this example
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This article describes how to merge multiple Shapefiles using the free Quantum GIS software. World's top universities | Most liveable cities | Football rankings | more