thank you

[wendellwt]

Thank you very much for doing this. I was able to follow your instructions & scripts and get a map to show up with tiles served from my own postile. It was quite challenging. (There were a couple of load scripts that were missing the postgresql port parameter.)

I think Web Mercator is wrong for many reasons, and I would like to make this server work with some sort of Lambert Conformal Conic, and just for the continental US. Where is the srs/srid/epsg/proj/whatever identifier for the type of tiles it serves? Or is that all in the browser?

Anyway, thank you.
Wendell

[acalcutt]

I'm glad my project was helpful. It took me a lot of time to go through the OpenMapTiles docker images and pull out all the various commands and applications they were using to build the maps. I still don't quite have the water layer right, but it works enough for my use when combined with another water layer I made.

I am using this with Maplibre GL, which forked from Mapbox GL fairly recently due to license changes on mapbox's part. If I'm not mistaken, I think they only support Web Mercator ( https://docs.mapbox.com/help/glossary/projection/ )

To serve the tiles I am using TileServer GL, with my style customizations in this project ( https://github.com/acalcutt/wifidb-tileserver-gl ). You can see my current map in use here ( https://wifidb.net/wifidb/opt/map.php?func=wifidbmap&labeled=0&sig_label=none )

[acalcutt]

I think the projections may come from the OpenMapTiles layer file. In my default config at config/env.config.
the import uses

IMPORT_LAYER_FILE=openmaptiles.yaml
and the export_mbtiles.sh script uses
EXPORT_LAYER_FILE=wdbmap.yaml

https://github.com/acalcutt/wdb-map-gen/blob/master/config/openmaptiles.yaml
https://github.com/acalcutt/wdb-map-gen/blob/master/config/wdbmap.yaml

At the bottom of those files it specifies
srs: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over

There are also a few of my import scripts that mention a target projection I beileive

I'm not much of a gis person here, but this is where I would look if I were looking to change the projection.

[wendellwt]

Thank you for the responses.

I looked at the postile.py source, and all of the comments say things like "read merc projection here". I asked them a question, but there doesn't seem to be much activity on their issues.

I've since found pg_tileserve. Since it is written by Paul Ramsey it must be good(!). I'll give it a try.

Your map sure looks nice. Is that what a MapBox Style does to OSM data? I'll have to try it out.

Wendell

[acalcutt]

With the Styles on Tileserver GL I am able to combine layers, So my map includes the OSM data, but I have also created some base layers using the Jaxa aw3d30 GeoTiffs, which give the elevation colors and hillshade.

Originally I made my own color and hillshade layers using some scripts here ( https://github.com/acalcutt/jaxa_AW3D30_to_MBTiles ). you can see some examples up for download here (https://drive.google.com/drive/folders/1Uo5xyFd8it7UH3pSmBiWP4lfZdM9OmhA)

Right now I am working on a TerrainRGB layer (also based on the jaxa images), which lets me do hillshade in maplibre gl/mapbox gl on the fly with better sharpness. Right now I am using that instead of the hillshade layer i generated before. The TerrainRGB is also needed for the new 3d terrain features maplibre is working on. (which I am testing but is not ready for prime time)

[acalcutt]

BTW, you mentioned just wanting to do the United States instead of the full planet.

You should be able to just change where it downloads the pbf file from
download-osm planet -o data/$PBF
to
download-osm north-america -o data/$PBF

[wendellwt]

Good idea, but I didn't get it to work. Neither of the US mirrors listed in your "class Catalog", (ftp.osuosl.org, ftpmirror.your.org) had north-america, only the planet one, and downloading anything from .de was taking forever.

I ended up d/l'ing the planet one from OSU and using osmconvert to crop it to conus.