gistfile1.md

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Stage 1 (extract the boundaries)

Step 1: Get the geojson file To begin with we need a Geojson representing the boundaries - For this example I am using the one present at https://github.com/datameet/maps/blob/b3fbbde595310b397a55d718e0958ce249a4fa1f/Country/india-soi.geojson- Download this file (Note : This file may possibly not be accurate - Please do thorough research before putting this in prod) - Replace the properties with "properties": { "name": "India", "admin_level": 2 } under the features json array

Step 2: Extract the admin boundaries- You can use mapshaper mapshaper india-osm.geojson -filter 'admin_level == 2' -lines -o boundaries.geojson - This extracts the boundaries where admin_level = 2 (Admin boundaries) - This will extract the boundaries to boundaries.geojson file

Step 3: Convert this to mbtiles using tippecanoe tippecanoe -o india_boundary.mbtiles boundaries.geojson

Step 4: Convert this mbtiles to pmtiles pmtiles convert india_boundary.mbtiles india_boundary.pmtiles

You will need to co-host this pmtiles along with the other pmtile that you have.

Stage 2 (Modify the style json file)

Host this in a server (Martin or something similar)

Step 1: Add a new source to your style spec (a.k.a style.json) file - Lets call it indiaosm

{ "indiaosm": { "type": "vector", "attribution": "<a href=\"https://github.com/protomaps/basemaps\">Protomaps</a> © <a href=\"https://openstreetmap.org\">OpenStreetMap</a>", "tiles": [ "https://<your-pm-tile-server>/path/{z}/{x}/{y}" ], "minzoom": 0, "maxzoom": 15 } }

Step 2: Update the borders with id "boundaries_country" to make sure that we ignore disputed territories

{ "id": "boundaries_country", "type": "line", "source": "protomaps", "source-layer": "boundaries", "filter": [ "all", [ "<=", "pmap:min_admin_level", 2 ], [ "!=", "disputed", true ] ], "paint": { "line-color": "#9e9e9e", "line-width": 1, "line-dasharray": [ 3, 2 ] } }

Step 3: Add a new layer that reads from indiaosm to style spec (a.k.a style.json) file

        "id": "boundaries_india",
        "type": "line",
        "source": "indiaosm",
        "source-layer": "boundaries",
        "filter": [
            "==",
            "admin_level",
            2
        ],
        "paint": {
            "line-color": "#9e9e9e", // Whatever color you want the border to be 
            "line-width": 1
        }
    }```

Only change I would suggest, is to download the official boundaries from Survey Of India's website and use those, instead of the Datameet Boundaries. The SOI boundaries are more accurate.

Hey @devdattaT Thanks - I will update this document with the SOI boundaries when I get time , And thanks for the boundaries in Datameet , Without this the solution would not have been possible !