Some processing features + fixes #3346
Conversation
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Just added another feature - this lets you select multiple fields when using the dissolve algorithm. It's another thing which is almost impossible to do reliably using the existing provider algorithms. @m-kuhn any idea on why the test is failing with a crs comparison? I can't see what I've done differently and it works locally processing team: is there any way to disable parameters based on another parameter? I find it confusing that the dissolve field choice is enabled when "dissolve all" is selected. I often run a dissolve after picking a field, only to have forgotten this checkbox and need to repeat the operation... |
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@nyalldawson Processing does not allow to change (enable/diable) algorithm parameters on the fly. Currently the only possible solution is to split algorithm into two with different set of parameters. |
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I remember I had some strange issues with CRS as well. I think it was related to some files (.xsd?) being checked in but that does not seem to be the case here... |
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hold on... there are xsd files. Can you try to remove them? |
This algorithm joins all connected parts of MultiLineString geometries into single LineString geometries. If any parts of the input MultiLineString geometries are not connected, the resultant geometry will be a MultiLineString containing any lines which could be merged and any non-connected line parts.
This allows you to dissolve based on more than one field value
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@m-kuhn So, turns out the xsd files are required. But in the end what worked was rewriting the gml using ogr2ogr. Not sure why, but it's fixed the test here. |
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So the main thing ogr2ogr did was adding even more xsd files? |
Main thing this PR does is implement a new algorithm for merging connected linestrings. I haven't found a good way to do this using the existing providers + algorithms, so always have to resort to PostGIS' st_linemerge function. This new algorithm makes it possible to do this in processing.
I've also fixed a bug in multipart to singlepart, and added some tests.