Re: [udig-users] How to: Merge layers

[marulic <marulic@xxxxxx>]

> I think a new spatial operation is required (Union). Please, could Marko
and
> Silvia confirm the following workflow ?
> 
> 1 - specifying the sources
> - select features from source layer 1
> - select features from source layer 2
> ..
> - select features from source layer n
>  
> 2 - specifying the result
> - select a a compatible target layer (geometry compatible with source) or
> create a new layer

I think that result of Union should always be new layer. Layer with
attributes (columns) table from selected reference layer or layer with
attributes table from all source layers. This way you can avoid filling
target layer.

Question is, what if source layers are now compatible with reference layer.

> 
> Questions and doubt:
> The operation produces features with the source geometries (without
> changes),
> doesn't it?

Yes.

> If a new layer is created the operation could make a new FeatureType using
> the
> feature type 's property of source (this behavior could be an option: copy
> data (yes/no)? ).

Looks find :-)

> In the other hand, if an existent layer is selected as target, we cannot
> modify its feature type. Options?

Yes! But if we produce new layer, as a result of Union, with feature type
from target (reference) layer we can choose (through options) to add
incompatible feature types to table, of result layer or to append geometries
of incompatible feature types to existing feature type of result layer, or
to discard incompatible feature types.

Marko

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