turf-sandbox snippet

script.turf-sandbox

const rectangleGrid = (
  bbox,
  cellWidth,
  cellHeight,
  options
) => {
  // Containers
  const results = [];
  const west = bbox[0];
  const south = bbox[1];
  const east = bbox[2];
  const north = bbox[3];

  const bboxWidth = east - west;
  const cellWidthDeg = turf.convertLength(cellWidth, options.units, "degrees");
  console.log("cellWidthDeg", cellWidthDeg)

  const bboxHeight = north - south;
  const cellHeightDeg = turf.convertLength(cellHeight, options.units, "degrees");
  console.log("cellHeightDeg", cellHeightDeg)

  const columns = Math.floor(Math.abs(bboxWidth) / cellWidthDeg);
  const rows = Math.floor(Math.abs(bboxHeight) / cellHeightDeg);

  // if the grid does not fill the bbox perfectly, center it.
  const deltaX = (bboxWidth - columns * cellWidthDeg) / 2;
  console.log('deltaX', deltaX)
  const deltaY = (bboxHeight - rows * cellHeightDeg) / 2;
  console.log('deltaY', deltaY)

  // iterate over columns & rows
  let currentX = west + deltaX;
  for (let column = 0; column < columns; column++) {
    let currentY = south + deltaY;
    for (let row = 0; row < rows; row++) {
      const cellPoly = turf.polygon(
        [
          [
            [currentX, currentY],
            [currentX, currentY + cellHeightDeg],
            [currentX + cellWidthDeg, currentY + cellHeightDeg],
            [currentX + cellWidthDeg, currentY],
            [currentX, currentY],
          ],
        ],
        options.properties
      );
      if (options.mask) {
        if (intersect(options.mask, cellPoly)) {
          results.push(cellPoly);
        }
      } else {
        results.push(cellPoly);
      }

      currentY += cellHeightDeg;
    }
    currentX += cellWidthDeg;
  }
  return turf.featureCollection(results);
}

//// EXAMPLE CODE ////

let squareGrid = rectangleGrid([-95, 30 ,-85, 40], 50, 50, {
  units:'miles'
});

let arr = squareGrid.features[0].geometry.coordinates[0]

let from = turf.point(arr[0]);
let to = turf.point(arr[1]);
let options = {units: 'miles'};
let distance = turf.distance(from, to, options);

let from1 = turf.point(arr[1]);
let to1 = turf.point(arr[2]);
let distance1 = turf.distance(from1, to1, options);
console.log(distance,distance1);

return turf.featureCollection([squareGrid, from, to, from1, to1]);