topic Displaying Different Basemaps (eg places) in Open Source Mapping Libraries Ques.

Displaying Different Basemaps (eg places)

DanielDormont — Fri, 25 Aug 2023 19:48:38 GMT

Hi,

I am trying out the new Places service, and specifically trying to display place information on my basemap. https://jsapi.maps.arcgis.com/home/item.html?id=177e576ca3c94d5890dc3c790b29c1be I found that item which has exactly the data I'm looking for. I was excited to discover that Leaflet's vectorBasemapLayer allows passing an item ID, so I tried that: https://codepen.io/dandormont-the-decoder/pen/eYQXOyr

And it seems to load, but nothing displays and there are errors like "duplicate layer id "Religion place/Other Religion", previously used at line undefined
at Object.Tr [as emitValidationErrors"

How can I load a layer like this using esri-leaflet?

Thanks, Dan

Re: Displaying Different Basemaps (eg places)

DanielDormont — Thu, 03 Aug 2023 20:18:03 GMT

Hm. I partly answered my own question by creating a copy of that style and editing it in the Vector Tile Style Editor. I went into the JSON and manually removed the duplicates. https://dawx3gjaixmoyunx.maps.arcgis.com/home/item.html?id=69b1cd50b88945f6aaa2ba2b29f3640d

If I use that item ID instead, the map does start to display but I have a newer and more mysterious error: "Unimplemented type: 3""

Re: Displaying Different Basemaps (eg places)

DanielDormont — Thu, 03 Aug 2023 22:00:15 GMT

Well, I found a workaround but I wouldn't quite call it a solution. Some googling suggested that the "unimplemented type 3" error comes when mapbox/maplibre downloads a PBF that is incorrectly gzipped. So I looked into all the PBFs that were being fetched, and while there were no gzip issues, there was this curiousity:

https://basemaps-api.arcgis.com/arcgis/rest/services/World_Basemap_v2/VectorTileServer/resources/fonts/Arial%20Bold,Arial%20Unicode%20MS%20Bold/0-255.pbf?token=MY_API_KEY

which returns a JSON error "Requested font resource not available" which is obviously not a valid PBF. I'm not sure what that means but when I went back to the vector editor, I indeed found many references to "Arial Unicode MS Bold". By deleting all of these, and creating another copy of my style layer, I was finally able to get the map to load.

But I'm a little confused. Why doesn't that fontstack load? And why doesn't the Map Viewer / ArcGIS Javascript have the same problem?

Re: Displaying Different Basemaps (eg places)

John-Foster — Fri, 04 Aug 2023 23:09:52 GMT

the map style https://jsapi.maps.arcgis.com/home/item.html?id=177e576ca3c94d5890dc3c790b29c1be is currently in beta release for evaluation only, and not considered ready to production use. Maybe the issues will get resolved once it is in production.

Re: Displaying Different Basemaps (eg places)

DanielDormont — Mon, 07 Aug 2023 21:12:39 GMT

@John-Foster

That's fair. I was more just trying to understand how map styles are loaded by the different clients and why this fails in this particular way