Created
June 28, 2024 05:44
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turf-sandbox snippet
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| 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]); |
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