data.ts

interface LineFeature {
  geometry: {
    type: string;
    coordinates: number[][];
  };
}

export const coordLinesData = {
  type: 'FeatureCollection',
  features: [] as LineFeature[],
};

// add meridians
for (let longitude = -180; longitude <= 180; longitude += 30) {
  const lineCoords: number[][] = [];
  for (let latitude = -90; latitude <= 90; latitude += 5) {
    lineCoords.push([longitude, latitude]);
  }

  coordLinesData.features.push({
    geometry: {
      type: 'LineString',
      coordinates: lineCoords,
    },
  });
}

// add parallels
for (let latitude = -90; latitude <= 90; latitude += 30) {
  coordLinesData.features.push({
    geometry: {
      type: 'LineString',
      coordinates: [[-180, latitude], [180, latitude]],
    },
  });
}