Distance entre deux points sur un chemin avec turf.js

Question

Il est possible de calculer la distance entre deux points sur une trajectoire en utilisant des gazons? Comment?

Answer 1

Tracez la ligne en utilisant vos deux points en utilisant turf.lineSlice. Cela renverra une nouvelle ligne qui ne comprend que les sections sur la ligne entre vos deux points. Ensuite, vous pouvez utiliser turf.lineDistance pour calculer la distance de cette ligne tranchée.

var line = { 
    "type": "FeatureCollection", 
    "features": [ 
    { 
     "type": "Feature", 
     "properties": {}, 
     "geometry": { 
     "type": "LineString", 
     "coordinates": [ 
      [4.0155029296875, 40.18726672309203 ], 
      [4.0814208984375, 40.195659093364654 ], 
      [4.15283203125, 40.19146303804063 ], 
      [4.185791015625, 40.17887331434696 ], 
      [4.2242431640625, 40.15788524950653 ], 
      [4.273681640625, 40.111688665595956 ], 
      [4.3011474609375, 40.06125658140474 ], 
      [4.290161132812499, 40.02340800226773 ], 
      [4.3341064453125, 39.97291055131899 ], 
      [4.4000244140625, 39.96870074491696 ], 
      [4.4659423828125, 39.977120098439634 ], 
      [4.531860351562499, 40.002371935876475 ], 
      [4.5648193359375, 40.052847601823984 ], 
      [4.5648193359375, 40.11588965267845 ] 
     ] 
     } 
    } 
    ] 
}; 

var start = { 
    "type": "Feature", 
    "properties": {}, 
    "geometry": { 
    "type": "Point", 
    "coordinates": [4.2400360107421875, 40.143189742924406 ] 
    } 
}; 
var stop = { 
    "type": "Feature", 
    "properties": {}, 
    "geometry": { 
    "type": "Point", 
    "coordinates": [4.3059539794921875, 40.00815750046493 ] 
    } 
}; 

var sliced = turf.lineSlice(start, stop, line.features[0]); 
var length = turf.lineDistance(sliced, 'kilometers');