[MapServer-users] MB Tiles vs. UTF grids

[Thomas Gratier]

Hello,

You have the answer at https://github.com/mapbox/mbtiles-spec#utfgrid Two
specs. In old days, utfgrid was part of the mbtiles spec directly
- mbtiles = contains raster or vector tiles
- utfgrid = store in the same scheme (xyz) json blob to be able to make
interactive map

Most of the time, when using mbtiles = you create a sqlite file
pregenerated and you serve raster/vector tiles and optionally utfgrid using
a small server without any mapping logic. The advantage = any hosting can
do it. Drawback = Can't refresh on the fly.

The alternative approach is to use a web map server that's able to read a
geospatial datasource and output from it an image/vector/utfgrid like if it
was serve from a mbtiles with yoururl/<z>/<x>/<y>.png (for raster) or
yoururl/<z>/<x>/<y>.pbf (for vector) or yoururl/<z>/<x>/<y>.json (for
utfgrid) but the data behind behind the scene is not stored in a mbtiles.
Advantage = clients libraries (OpenLayers, Leaflet,...) are able to consume
raster/vector tiles or utfgrid like if served from static mbtiles. Drawback
= special hosting to deploy and use your web map server.

Not sure it's enough clear.

Regards,


Thomas Gratier



Le sam. 3 sept. 2022 à 01:05, Scott <public at postholer.com> a écrit :

> I'm ill equipped to answer your question directly.
>
> However, as you delve into the world of vector tiles I'd strongly
> suggest taking a look a FlatGeoBuf (.fgb). It's an index format
> supported by GDAL and MapServer. It's very fast and painless.
>
> The home page has demo's for openlayers, leaflet and mapbox, using a
> single 12GB census data file. Leaflet seems to be the most responsive.
>
> http://flatgeobuf.org/
>
>
>
>
> On 9/2/22 15:22, karsten wrote:
> > Hi All,
> > For the first time, I am diving into actually using vector tiles and or
> > UTF grids on an OpenLayers map. I am confused  about UTF grids,
> > especially I could not find clear answers whether UTFGrids have been
> > completely replaced by MB Tiles or if UTF Grids are now a subset of MB
> > Tiles. Posts on the web seem to suggest that UTF grids can be stored
> > inside MB Tiles
> > <
> https://medium.com/@pyin001/utfgrid-and-mbtiles-map-file-decoding-on-android-864487697752>.
>
> > Note that I am trying to stay outside the Mapbox empire (as much as
> > possible) and trying to use GDAL, MapServeretc.
> > GDAL can produce MB tiles (but not sure if that includes UTF grid info
> > as well) and MapServer can deliver UTF grid via WMS on the fly, but not
> > sure how performance is so far ...
> > Would anyone have some insights ?
> > Thanks
> > Karsten Vennemann
> > www.terragis.net <http://www.terragis.net>
> >
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