[Talk-ca] Where are the Great Lakes?

[Pilon, Michel (SSC/SPC)]

Thanks for your help Stewart.



But my issue is that all Great Lakes (except Lac Érié) are not rendered event at low zooms as you can see below :-/



I installed the whole planet 3 weeks ago and apply minute changes. I also pregenerated tiles for level 0 to 10 with the command render-list.



As you can see in the attachment smaller lakes appeard but all Great Lakes are not shown even at high level zooms (except Érié).



I am wandering if my options for osm2pgsql during updates can cause the issue?


OSM2PGSQL_OPTIONS="--number-processes 8 --hstore --keep-coastlines -C 27000 --multi-geometry"



As I said I am new with OSM and here is what I did (roughly):

·        Install OSM on ubuntu 16.04

·        wget -c http://planet.openstreetmap.org/pbf/planet-latest.osm.pbf

·        osmupdate planet-latest.osm.pbf new_planet-latest.osm.pbf

·        osm2pgsql --create --slim --flat-nodes /data/osm/pgload/flat_nodes.bin \
         -C 27000 --number-processes 8 --hstore --keep-coastlines \
         --style /data/osm/openstreetmap-carto-3.2.0/openstreetmap-carto.style \
         --multi-geometry /data/osm/new_planet-latest.osm.pbf

·        Install mod_tile

·        Install fonts-noto

·        Configure stylesheet (mapnik)

·        Configure renderd

·        Pre-render tiles level 0 to 10 using render-list

·        Do minute updates by using /usr/bin/openstreetmap-tiles-update-expire



Everything works well except the fact that I lost big lakes at ALL levels.



Any clue/hints?  Is there something I did wrong? A step I missed?



I have another server where I installed a new fresh OSM implementation 3 days ago where I did not implement updates and I can see actually the Big Lakes for all level except, as you said at low zoom levels.



Thanks you very much for helping….



Michel







-----Original Message-----
From: Stewart C. Russell [mailto:scruss at gmail.com]
Sent: August 1, 2017 16:31
To: talk-ca at openstreetmap.org<mailto:talk-ca at openstreetmap.org>
Subject: Re: [Talk-ca] Where are the Great Lakes?



On 2017-08-01 04:21 PM, Pilon, Michel (SSC/SPC) wrote:

>

> But at my surprise today I realize that the Great Lakes are not there

> anymore for all zoom levels!



“The Great Lakes were tagged as natural=coastline, even though that is for the ocean, because the coastline ways are rendered at low zoom levels. They were changed to water=lake and as a result disappeared from the default map layer. The correct fix is to teach the default stylesheet how to render lakes at low zoom levels.”

— https://wiki.openstreetmap.org/wiki/Tagging_for_the_renderer#Examples



Basically, they're tagged as lakes. But the arbitrary decision to not render lakes when zoomed out ('cos typically lakes are small, compared to countries) leads to them not being drawn. It's okay, all is well.

Don't try to retag them.



Stewart



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