Missing maxNativeZoom for vector tiles in iOS lib

[millenbop]

We serve vector tiles up to zoom level 16, but sometimes we need to go up to zoom level 18. If the tiles are loaded at a lower zoom level and the map is zoomed in, it seems to interpolate the vector tiles it already has, but if the map starts loading at zoom level > 16, they are not displayed.

It's not a very clean solution and is prone to errors.

It would be very useful to have maxNativeZoom in this lib (for iOS) as well, similar to https://www.mapbox.com/mapbox.js/api/v2.2.2/l-tilelayer/

Option	Description
minZoom	Minimum zoom number.
maxZoom	Maximum zoom number.
maxNativeZoom	Maximum zoom number the tiles source has available. If it is specified, the tiles on all zoom levels higher than maxNativeZoom will be loaded from maxZoom level and auto-scaled.

[jfirebaugh]

if the map starts loading at zoom level > 16, they are not displayed

This behavior is not expected -- it should display the z16 level tiles.

In short, since vector tiles are highly amenable to overscaling, it's always assumed that maxZoom for a vector tile source should be treated as "maxNativeZoom", and we will likely not add a separate option. There is a separate map-wide maximum zoom -- currently 18, but we intend to make that configurable.

[millenbop]

Ah, sounds like a bug then. There is no property for maxZoom in the iOS lib though. If I put "maxZoom": 16 in the layer style, it still tries to load zoom levels over 16:

2015-10-26 13:13:29.183 Mapillary[19832:316569] [ERROR] {Map}[Style]: Failed to load [https://SOMEURL/tiles/17/70341/40998.mapbox]: HTTP status code 403 2015-10-26 13:13:29.217 Mapillary[19832:316569] [ERROR] {Map}[Style]: Failed to load [https://SOMEURL/tiles/18/140682/81997.mapbox]: HTTP status code 403

[millenbop]

Thanks for fixing this! Just integrated 3.0 and works like a charm.

[jfirebaugh]

Great! We didn't knowingly do anything to fix this for 3.0, but it's possible it got fixed as a side effect of something else.

[millenbop]

I'm sorry, I was a bit fast there, it still tries to load tiles for zoom levels that doesn't exist. So please reopen!

Did some work on the map parts in the app today and it doesn't work. I was just being lucky before, i.e. I had zoom set at 10 and our tiles were loaded, than when zoomed to > 16, it (probably) interpolated those tiles.

Maybe I'm doing something wrong here. In the style I set add our layer this way:

source:
"mapillary": {
    "tiles": [
        "https://SOMEURL/tiles/{z}/{x}/{y}.mapbox"
    ],
    "type": "vector"
}

layer:
{
    "id": "mapillary",
    "maxzoom": 16,
    "type": "line",
    "source": "mapillary",
    "source-layer": "mapillary-sequences",
    "interactive": true,
    "layout": {
        "line-join": "round",
        "line-cap": "round"
    },
    "paint": {
        "line-opacity": 0.6,
        "line-color": "#35af6d",
        "line-width": 2
    }
}

and I expect it to only load tiles for zoom level 16 and lower, but still get

2015-12-15 15:13:09.964 Mapillary[734:114998] [ERROR] {Map}[Style]: Failed to load [https://SOMEURL/tiles/17/70274/41071.mapbox]:

[millenbop]

It seems it has gotten worse in later releases. I hope this video will help illustrate the problem better.

Untitled.mp4.zip

[millenbop]

Perhaps the original post is a bit off and should create a new one?

[jfirebaugh]

@millenbop Yes, can you please create a new issue if this is still occurring?

[millenbop]

Yeah seems like it still exists. I have created #4969