[wishlist] Please export layer information in .geojson

[yohanboniface]

Originally reported by: BitBucket: maniacbug, GitHub: maniacbug

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Layers are a great organizational technique for markers/etc. Unfortunately, they are lost when exported. Perhaps the layer name could be included in the "properties" for each point.

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• Bitbucket: https://bitbucket.org/yohanboniface/umap/issue/174

[yohanboniface]

There is now a "umap" format to export data and metadata.

[joostschouppe]

The umap format does not fix this (afaik) if you want to re-use your data in another setting, say in QGIS.

[yohanboniface]

Can you clarify what you want to do and what is missing for this?

Situation: there is an "all data" geojson export and a uMap one (indeed dedicated for reuse in uMap)).

[joostschouppe]

I made a umap instance with about 1000 objects to verify in the field. I put these objects in a layer called "to verify". Then I made two empty layers ("verified", "special cases"), to which the terrain worker could move these objects.
I now want to use this data for statistical analysis, so I'm working towards a structured table. I was trying to do this by exporting the geojson, then exporting the attribute table to a flat format like csv. But to get this to work, I had to manually fill an a new field.

It would have been fine for me if:

• the geojson contained an attribute with the layer name
• a single layer could be exported to a single geojson
• I would be able to open a umap file in QGIS
• I would be smart enough to write a .umap parser in 15 minutes

Come to think of it, I could have taken the umap file, and use it to make a new umap instance. Then empty all the layers except one, then export as geojson.

EDIT: I don't know if I changed something, but when I make layers invisible now, I do get an export of visible layers only. So that is in fact good enough for me.

[yohanboniface]

a single layer could be exported to a single geojson

This is possible (but a bit click greedy): when exporting in geojson, only the visible layers will be considered, so you can export layers one by one by only showing them one by one.

Does it help?

[joostschouppe]

Yes, as I indicated in my edit, this is OK for me. It just didn't work the first time I tried.

[stevage]

I also would find it valuable if the layer name was included in the GeoJSON export. Either like this:

properties: {
    _layer: "myLayer"
}

or like this:

{
   type: "Feature",
   layer: "myLayer",
   properties: {...},
   geometry: {...}
}

Having it only in the "umap" format means you then need to convert that into GeoJSON.

[almereyda]

@stevage Since this issue is closed since almost two years, I would suggest to open a new one.

[yohanboniface]

{
   type: "Feature",
   layer: "myLayer",
   properties: {...},
   geometry: {...}
}

Sounds legit, I'll have a try on it.

[yohanboniface]

Given it's also possible to download one layer in geojson (through avdanced actions for now), I'm not sure this needs still exist.