Re: [OSM-dev] Evaluate layer list from CartoCSS style

[Stadin, Benjamin]

Thanks for your response. I indeed want to recreate the OSM style (or
adapt it, then recreate from that style).

Seems parsing these files would fairly simple. Though is there a default
implementation that handles the style parsing (in case I need to fetch
other style info which I do not forsee yet)?


Am 29.08.16, 05:28 schrieb "Paul Norman" unter :

>On 8/28/2016 8:07 AM, Stadin, Benjamin wrote:
>> we’re defining the data structure for the next version of our 3D map, a
>> basic feature of it is the indoor capability. I could write more about
>>the
>> background, but to keep it short for now: I need to generate an ordered
>> list of layers with their table names in the rendering db, so ordered
>>from
>> „bottom layer to top layer“, out of a Carto CSS style definition (e.g.
>> from the actual OSM style def.
>> https://github.com/gravitystorm/openstreetmap-carto).
>
>The typical osm2pgsql rendering database does not have layers. It has
>tables for points, lines, polygons, and one for data commonly used at
>low zooms.
>
>OpenStreetMap Carto comes with layers, but these are not layers in the
>traditional GIS sense. They are layers which are rendered and the layer
>definitions are not intended to be meaningful outside of the specific
>style. These regularly change between style versions and copying them is
>a bad idea unless you want to recreate that specific style.
>
>If you do want to do that, the style definitions are in YAML and should
>be easy to parse.
>
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>dev mailing list
>dev@openstreetmap.org
>https://lists.openstreetmap.org/listinfo/dev

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Re: [OSM-dev] Evaluate layer list from CartoCSS style

[Paul Norman]

On 8/28/2016 8:07 AM, Stadin, Benjamin wrote:

we’re defining the data structure for the next version of our 3D map, a
basic feature of it is the indoor capability. I could write more about the
background, but to keep it short for now: I need to generate an ordered
list of layers with their table names in the rendering db, so ordered from
„bottom layer to top layer“, out of a Carto CSS style definition (e.g.
from the actual OSM style def.
https://github.com/gravitystorm/openstreetmap-carto).


The typical osm2pgsql rendering database does not have layers. It has 
tables for points, lines, polygons, and one for data commonly used at 
low zooms.


OpenStreetMap Carto comes with layers, but these are not layers in the 
traditional GIS sense. They are layers which are rendered and the layer 
definitions are not intended to be meaningful outside of the specific 
style. These regularly change between style versions and copying them is 
a bad idea unless you want to recreate that specific style.


If you do want to do that, the style definitions are in YAML and should 
be easy to parse.


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[OSM-dev] Evaluate layer list from CartoCSS style

[Stadin, Benjamin]

Hi, 

we’re defining the data structure for the next version of our 3D map, a
basic feature of it is the indoor capability. I could write more about the
background, but to keep it short for now: I need to generate an ordered
list of layers with their table names in the rendering db, so ordered from
„bottom layer to top layer“, out of a Carto CSS style definition (e.g.
from the actual OSM style def.
https://github.com/gravitystorm/openstreetmap-carto).

I think there is a better way than parsing the project file and style
files on my own, but I didn’t find a good starting point yet.

Thanks
Ben

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