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hholzgra / maposmatic

Mirror of maposmatic repository at savannah.nongnu.org
GNU Affero General Public License v3.0
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Sea marks layer as overlay #62

Closed hamlet closed 2 years ago

hamlet commented 2 years ago

Hi.

Would you consider adding an overlay based on the "Sea Marks" layer from OpenSeaMap ?

Regards.

hholzgra commented 2 years ago

I'm getting requests for OpenSeaMap support quite often.

Unfortunately OpenSeaMap is using a totally different render solution than the Mapnik render library used to create standard OpenStreetMap tiles, and also the maps produced by this service.

So there's no easy way to get OpenSeaMap styles / layers integrated into the MapOSMatic software stack. I could try to just render their bitmap tiles as an overlay, but that would probably not look too well as I'd have no way to match the bitmap resolution of that tiles with the resolution and scale I'm actually rendering for.

Also trying to re-create the Sea Marks layer as a Mapnik style won't be easy as Mapnik does not support custom circle arc symbols as needed for beacon light visibility symbols ...

hamlet commented 2 years ago

So there's no easy way to get OpenSeaMap styles / layers integrated into the MapOSMatic software stack. I could try to just render their bitmap tiles as an overlay, but that would probably not look too well as I'd have no way to match the bitmap resolution of that tiles with the resolution and scale I'm actually rendering for.

I thought it would as simple as overlaying tiles layers in slippy maps like Leaflet. I'm naive. ;-)

Also trying to re-create the Sea Marks layer as a Mapnik style won't be easy as Mapnik does not support custom circle arc symbols as needed for beacon light visibility symbols ...

I'm not sure the beacon light visibility symbols are the most useful of the layer, but anyway it would be a significant work to adapt I guess.

Thanks for your complete answer.

Best regards.