Some Vector Tile style sheets don't work with custom viewer.

ZedeN1 commented 1 month ago

I compiled a custom viewer as per #586. For the Vector Tile Grayscale backgroundLayer below, the custom viewer does not GET the tiles if the Greyscale style is used. The same vector tile with the colour styles works OK.

I can see that Firefox manages to GET the greyscale style json. I don't see any logs that would explain or point at the issue.

The default qwc-docker viewer manages to display the same Vector Tile without problem.

{
        "name": "Vector Tile Grayscale",
        "type": "mvt",
        "url": "https://api.os.uk/maps/vector/v1/vts/tile/{z}/{y}/{x}.pbf?srs=3857&key=xxxxxx",
        "style": "https://raw.githubusercontent.com/OrdnanceSurvey/OS-Vector-Tile-API-Stylesheets/master/OS_VTS_3857_Greyscale.json",
        "declutter": false,
        "projection": "EPSG:3857",
        "thumbnail": "vt_grayscale.png"
      },
      {
        "name": "Vector Tile Colour",
        "type": "mvt",
        "url": "https://api.os.uk/maps/vector/v1/vts/tile/{z}/{y}/{x}.pbf?srs=3857&key=xxxxxx",
        "style": "https://api.os.uk/maps/vector/v1/vts/resources/styles?srs=3857&key=xxxxxx",
        "declutter": false,
        "projection": "EPSG:3857",
        "thumbnail": "vt_colour.png"
      },

ZedeN1 commented 1 month ago

Reverting components/map/layers/MVTLayer.js to https://github.com/qgis/qwc2/blob/c3159281e9021cd504783f7d3873e192c8fe8aee/components/map/layers/MVTLayer.js fixes the issue.

Commit https://github.com/qgis/qwc2/commit/f310a2e815f62ea2ea524b592a1b95cb302c85ee seems to be the cause

manisandro commented 1 month ago

I'll need to look into this. How can one obtain a key for this service?

ZedeN1 commented 1 month ago

https://osdatahub.os.uk/

It's free under fair use.

manisandro commented 1 month ago

Does [1] help along with

                    {
                "name": "os_uk_vt_colour",
                "type": "mvt",
                "url": "https://api.os.uk/maps/vector/v1/vts/tile/{z}/{y}/{x}.pbf?srs=3857&key=xxx",
                "style": "https://api.os.uk/maps/vector/v1/vts/resources/styles?srs=3857&key=xxx",
                "declutter": false,
                "projection": "EPSG:3857",
                "thumbnail": "vt_colour.png",
                "styleOptions": {
                    "accessTokenParam": "key",
                    "accessToken": "xxx"
                }
              }

? For me, it renders the colour style correctly. It also renders the gray style, but completely off-place.

[1] https://github.com/qgis/qwc2/commit/e2e49d04a6cf4a3f128aa7fb1966aa58f2b661e3

qgis / qwc2-demo-app

Some Vector Tile style sheets don't work with custom viewer. #587