{
    "_info": "Taken from https://github.com/mjaschen/gravel-overlay, with prior authorization from the author (https://github.com/gpxstudio/gpx.studio/issues/32#issuecomment-2320219804).",
    "version": 8,
    "name": "Gravel Overlay",
    "metadata": {
        "mapbox:autocomposite": false,
        "mapbox:type": "template",
        "maputnik:renderer": "mbgljs",
        "openmaptiles:version": "3.x",
        "openmaptiles:mapbox:owner": "openmaptiles",
        "openmaptiles:mapbox:source:url": "mapbox://openmaptiles.4qljc88t"
    },
    "sources": {
        "openmaptiles": {
            "type": "vector",
            "url": "https://tiles.bikerouter.de/services/gravel/"
        }
    },
    "sprite": "https://demotiles.maplibre.org/styles/osm-bright-gl-style/sprite",
    "glyphs": "https://api.maptiler.com/fonts/{fontstack}/{range}.pbf?key={key}",
    "layers": [
        {
            "id": "background",
            "type": "background",
            "layout": {
                "visibility": "none"
            },
            "paint": {
                "background-color": "rgba(145, 211, 164, 1)"
            }
        },
        {
            "id": "debug_rail",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "filter": ["all", ["==", "$type", "LineString"], ["in", "class", "rail"]],
            "layout": {
                "visibility": "none"
            },
            "paint": {
                "line-color": "rgba(144, 144, 144, 1)"
            }
        },
        {
            "id": "debug_road",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                [
                    "in",
                    "class",
                    "motorway",
                    "trunk",
                    "primary",
                    "secondary",
                    "tertiary",
                    "minor",
                    "residential",
                    "track",
                    "path"
                ]
            ],
            "layout": {
                "visibility": "none"
            },
            "paint": {
                "line-color": "rgba(204, 204, 204, 1)",
                "line-width": {
                    "stops": [
                        [10, 0.5],
                        [12, 1]
                    ]
                }
            }
        },
        {
            "id": "tr_X_g45-bg",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", ["geometry-type"], "LineString"],
                ["match", ["get", "class"], ["track"], true, false],
                [
                    "any",
                    ["match", ["get", "tracktype"], ["grade5"], true, false],
                    [
                        "all",
                        ["match", ["get", "tracktype"], ["grade4"], true, false],
                        ["match", ["get", "surface"], ["dirt", "grass", "mud", "sand"], true, false]
                    ]
                ]
            ],
            "layout": {
                "line-cap": "square",
                "line-join": "bevel",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 0, 0, 0.7)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.4],
                        [12, 1.3],
                        [14, 1.7]
                    ]
                },
                "line-dasharray": [1],
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 1.8],
                        [15, 3],
                        [16, 4]
                    ],
                    "base": 1.55
                }
            }
        },
        {
            "id": "tr_X_g45",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", ["geometry-type"], "LineString"],
                ["match", ["get", "class"], ["track"], true, false],
                [
                    "any",
                    ["match", ["get", "tracktype"], ["grade5"], true, false],
                    [
                        "all",
                        ["match", ["get", "tracktype"], ["grade4"], true, false],
                        ["match", ["get", "surface"], ["dirt", "grass", "mud", "sand"], true, false]
                    ]
                ]
            ],
            "layout": {
                "line-cap": "square",
                "line-join": "bevel",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 255, 0, 0.7)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.4],
                        [12, 1.3],
                        [14, 1.7]
                    ]
                },
                "line-dasharray": [2, 2],
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 1.8],
                        [15, 3],
                        [16, 4]
                    ],
                    "base": 1.55
                }
            }
        },
        {
            "id": "tr_B_g3",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", ["geometry-type"], "LineString"],
                ["==", ["get", "class"], "track"],
                ["match", ["get", "tracktype"], ["grade3"], true, false],
                [
                    "any",
                    ["match", ["get", "smoothness"], ["bad", "good", "intermediate"], true, false],
                    [
                        "match",
                        ["get", "surface"],
                        ["compacted", "fine_gravel", "gravel"],
                        true,
                        false
                    ]
                ]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(235, 6, 158, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.4],
                        [12, 1.3],
                        [14, 1.7]
                    ]
                },
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 2],
                        [15, 4],
                        [16, 5]
                    ],
                    "base": 1.55
                },
                "line-dasharray": [3, 1.5]
            }
        },
        {
            "id": "tr_A_g2-plain-case",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", ["geometry-type"], "LineString"],
                ["==", ["get", "class"], "track"],
                ["match", ["get", "tracktype"], ["grade2"], true, false],
                ["!", ["has", "surface"]],
                ["!", ["has", "smoothness"]]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 255, 255, 0.6)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.8],
                        [12, 3],
                        [14, 4]
                    ]
                },
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 1.5],
                        [15, 3],
                        [16, 4]
                    ],
                    "base": 1.55
                }
            }
        },
        {
            "id": "tr_A_g2-plain",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", ["geometry-type"], "LineString"],
                ["==", ["get", "class"], "track"],
                ["match", ["get", "tracktype"], ["grade2"], true, false],
                ["!", ["has", "surface"]],
                ["!", ["has", "smoothness"]]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(235, 6, 158, 0.6)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.5],
                        [12, 1.5],
                        [14, 2]
                    ]
                },
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 1.5],
                        [15, 3],
                        [16, 4]
                    ],
                    "base": 1.55
                },
                "line-dasharray": [5, 1]
            }
        },
        {
            "id": "tr_A_g2-case",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", ["geometry-type"], "LineString"],
                ["==", ["get", "class"], "track"],
                ["match", ["get", "tracktype"], ["grade2"], true, false],
                [
                    "any",
                    [
                        "match",
                        ["get", "surface"],
                        ["compacted", "fine_gravel", "gravel"],
                        true,
                        false
                    ],
                    ["match", ["get", "smoothness"], ["bad", "good", "intermediate"], true, false]
                ]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 255, 255, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.8],
                        [12, 3],
                        [14, 4]
                    ]
                },
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 2],
                        [15, 4],
                        [16, 5]
                    ],
                    "base": 1.55
                }
            }
        },
        {
            "id": "tr_A_g2",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", ["geometry-type"], "LineString"],
                ["==", ["get", "class"], "track"],
                ["match", ["get", "tracktype"], ["grade2"], true, false],
                [
                    "any",
                    [
                        "match",
                        ["get", "surface"],
                        ["compacted", "fine_gravel", "gravel"],
                        true,
                        false
                    ],
                    ["match", ["get", "smoothness"], ["bad", "good", "intermediate"], true, false]
                ]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(235, 6, 158, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.5],
                        [12, 1.5],
                        [14, 2]
                    ]
                },
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 2],
                        [15, 4],
                        [16, 5]
                    ],
                    "base": 1.55
                }
            }
        },
        {
            "id": "p_X-bg",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                ["in", "class", "path"],
                ["in", "smoothness", "very_bad", "horrible", "very_horrible", "impassable"],
                ["!in", "tracktype", "grade5", "grade4"]
            ],
            "layout": {
                "line-cap": "square",
                "line-join": "bevel",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 0, 0, 0.7)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.4],
                        [12, 1.1],
                        [14, 1.5]
                    ]
                },
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 1.8],
                        [15, 3],
                        [16, 4]
                    ],
                    "base": 1.55
                }
            }
        },
        {
            "id": "p_X",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                ["in", "class", "path"],
                ["in", "smoothness", "very_bad", "horrible", "very_horrible", "impassable"],
                ["!in", "tracktype", "grade5", "grade4"]
            ],
            "layout": {
                "line-cap": "square",
                "line-join": "bevel",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 255, 0, 0.7)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.4],
                        [12, 1.1],
                        [14, 1.5]
                    ]
                },
                "line-dasharray": [2, 2],
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 1.8],
                        [15, 3],
                        [16, 4]
                    ],
                    "base": 1.55
                }
            }
        },
        {
            "id": "p_B",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                ["==", "class", "path"],
                ["in", "smoothness", "good", "intermediate", "bad"],
                [
                    "!in",
                    "surface",
                    "gravel",
                    "fine_gravel",
                    "compacted",
                    "cobblestone",
                    "sett",
                    "unhewn_cobblestone",
                    "paving_stones"
                ],
                ["!in", "bicycle", "no"],
                ["!in", "access", "no"]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(235, 6, 158, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.4],
                        [12, 1.1],
                        [14, 1.5]
                    ]
                },
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 2],
                        [15, 4],
                        [16, 5]
                    ],
                    "base": 1.55
                },
                "line-dasharray": [1.5, 1]
            }
        },
        {
            "id": "p_A-case",
            "type": "line",
            "metadata": {
                "maputnik:comment": "Gravel surface with ok-ish smoothness"
            },
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", ["geometry-type"], "LineString"],
                ["==", ["get", "class"], "path"],
                [
                    "any",
                    ["match", ["get", "surface"], ["compacted", "fine_gravel"], true, false],
                    [
                        "all",
                        ["match", ["get", "surface"], ["gravel"], true, false],
                        [
                            "match",
                            ["get", "smoothness"],
                            ["bad", "good", "intermediate"],
                            true,
                            false
                        ]
                    ]
                ],
                ["match", ["get", "bicycle"], ["no"], false, true],
                ["match", ["get", "access"], ["no"], false, true]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 255, 255, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.7],
                        [12, 2.5],
                        [14, 3.2]
                    ]
                },
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 2],
                        [15, 4],
                        [16, 5]
                    ],
                    "base": 1.55
                }
            }
        },
        {
            "id": "p_A",
            "type": "line",
            "metadata": {
                "maputnik:comment": "Gravel surface with ok-ish smoothness"
            },
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", ["geometry-type"], "LineString"],
                ["==", ["get", "class"], "path"],
                [
                    "any",
                    ["match", ["get", "surface"], ["compacted", "fine_gravel"], true, false],
                    [
                        "all",
                        ["match", ["get", "surface"], ["gravel"], true, false],
                        [
                            "match",
                            ["get", "smoothness"],
                            ["bad", "good", "intermediate"],
                            true,
                            false
                        ]
                    ]
                ],
                ["match", ["get", "bicycle"], ["no"], false, true],
                ["match", ["get", "access"], ["no"], false, true]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(235, 6, 158, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.5],
                        [12, 1.5],
                        [14, 2]
                    ]
                },
                "line-offset": {
                    "stops": [
                        [12, 0],
                        [13, 2],
                        [15, 4],
                        [16, 5]
                    ],
                    "base": 1.55
                }
            }
        },
        {
            "id": "r_X_cobbles-case",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                ["in", "class", "minor", "service", "track", "path", "residential"],
                ["in", "surface", "sett", "cobblestone", "unhewn_cobblestone"],
                ["!in", "service", "driveway"]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(0, 0, 0, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.5],
                        [12, 1.5],
                        [14, 2]
                    ]
                }
            }
        },
        {
            "id": "r_X_cobbles",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                ["in", "class", "minor", "service", "track", "path", "residential"],
                ["in", "surface", "sett", "cobblestone", "unhewn_cobblestone"],
                ["!in", "service", "driveway"]
            ],
            "layout": {
                "line-cap": "butt",
                "line-join": "miter",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(245, 255, 0, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.5],
                        [12, 1.5],
                        [14, 2]
                    ]
                },
                "line-dasharray": [1.5, 1]
            }
        },
        {
            "id": "r_X-bg",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                ["in", "class", "minor"],
                ["in", "smoothness", "very_bad", "horrible", "very_horrible", "impassable"],
                ["!in", "surface", "sett", "cobblestone", "unhewn_cobblestone"]
            ],
            "layout": {
                "line-cap": "square",
                "line-join": "bevel",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 0, 0, 0.7)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.4],
                        [12, 1.1],
                        [14, 1.5]
                    ]
                }
            }
        },
        {
            "id": "r_X",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                ["in", "class", "minor"],
                ["in", "smoothness", "very_bad", "horrible", "very_horrible", "impassable"],
                ["!in", "surface", "sett", "cobblestone", "unhewn_cobblestone"]
            ],
            "layout": {
                "line-cap": "square",
                "line-join": "bevel",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 255, 0, 0.7)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.4],
                        [12, 1.1],
                        [14, 1.5]
                    ]
                },
                "line-dasharray": [2, 2]
            }
        },
        {
            "id": "r_A_case",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                ["in", "class", "minor", "residential", "service"],
                ["in", "surface", "gravel", "compacted", "fine_gravel"],
                ["!in", "service", "driveway", "parking_aisle", "drive-through", "emergency_access"]
            ],
            "layout": {
                "line-cap": "square",
                "line-join": "bevel",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(255, 255, 255, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.8],
                        [12, 3],
                        [14, 4]
                    ]
                }
            }
        },
        {
            "id": "r_A",
            "type": "line",
            "source": "openmaptiles",
            "source-layer": "transportation",
            "minzoom": 10,
            "filter": [
                "all",
                ["==", "$type", "LineString"],
                ["in", "class", "minor", "residential", "service"],
                ["in", "surface", "gravel", "compacted", "fine_gravel"],
                ["!in", "service", "driveway", "parking_aisle", "drive-through", "emergency_access"]
            ],
            "layout": {
                "line-cap": "square",
                "line-join": "bevel",
                "visibility": "visible"
            },
            "paint": {
                "line-color": "rgba(235, 6, 158, 1)",
                "line-width": {
                    "base": 1.55,
                    "stops": [
                        [10, 0.5],
                        [12, 1.5],
                        [14, 2]
                    ]
                }
            }
        },
        {
            "id": "cemetery",
            "type": "symbol",
            "source": "openmaptiles",
            "source-layer": "landuse",
            "filter": ["all", ["==", "class", "cemetery"]],
            "layout": {
                "icon-image": "cemetery_11",
                "icon-rotation-alignment": "map",
                "icon-size": 1.5
            }
        },
        {
            "id": "drinking_water",
            "type": "symbol",
            "source": "openmaptiles",
            "source-layer": "poi",
            "minzoom": 9,
            "maxzoom": 20,
            "filter": [
                "any",
                ["==", "class", "drinking_water"],
                ["==", "subclass", "drinking_water"]
            ],
            "layout": {
                "icon-image": "drinking_water_11",
                "visibility": "visible",
                "icon-rotation-alignment": "map",
                "icon-size": 1.4
            }
        }
    ],
    "id": "basic",
    "owner": "Marcus Jaschen"
}