function decode(json) {
    if (!json.UTF8Encoding) {
        return json;
    }
    var encodeScale = json.UTF8Scale;
    if (encodeScale == null) {
        encodeScale = 1024;
    }

    var features = json.features;

    for (var f = 0; f < features.length; f++) {
        var feature = features[f];
        var geometry = feature.geometry;
        var coordinates = geometry.coordinates;
        var encodeOffsets = geometry.encodeOffsets;

        for (var c = 0; c < coordinates.length; c++) {
            var coordinate = coordinates[c];

            if (geometry.type === 'Polygon') {
                coordinates[c] = decodePolygon(
                    coordinate,
                    encodeOffsets[c],
                    encodeScale
                );
            }
            else if (geometry.type === 'MultiPolygon') {
                for (var c2 = 0; c2 < coordinate.length; c2++) {
                    var polygon = coordinate[c2];
                    coordinate[c2] = decodePolygon(
                        polygon,
                        encodeOffsets[c][c2],
                        encodeScale
                    );
                }
            }
        }
    }
    // Has been decoded
    json.UTF8Encoding = false;
    return json;
}
@param {module:echats/coord/Axis} axis
@param {module:echarts/model/Model} tickModel For example, can be axisTick, splitLine, splitArea.
@return {Object} {
    ticks: Array.<number>
    tickCategoryInterval: number
}