Helper function for geospatial feature engineering
npm install nearest-mrtA helper function for geospatial feature engineering.
To find the nearest MRT station given a location's longitude & latitude.
Credits Singapore Land Authority (SLA) OneMap API service for location data.
bash
npm install --save nearest-mrt
`javascript
import getNearestMrt from 'nearest-mrt'const target = [103.736083, 1.341832]
/**
* @param lnglat - coordinates of query location (required)
* @param excludeFuture - whether to exclude future stations ({boolean}, default false)
* @param radius - limit radius of search in meters ({numeric}, default 1000)
*/
const nearestMRT = getNearestMrt(target, false, 2000)
console.log(nearestMRT)
`$3
json
{
"query": {
"lnglat": [
103.736083,
1.341832
],
"excludeFuture": false,
"radius": 2000
},
"result": [
{
"rank": 1,
"station": {
"name": "CHINESE GARDEN",
"code": "EW25",
"longitude": 103.7327666,
"latitude": 1.3422449,
"x": 16809.69,
"y": 36044.45,
"line": {
"NSL": 0,
"EWL": 1,
"CGL": 0,
"NEL": 0,
"CCL": 0,
"DTL": 0,
"TEL": 0,
"JRL": 0
},
"operational": 1,
"interchange": 0,
"locations": [
{
"platform": "EW25",
"longitude": 103.7327663,
"latitude": 1.3422443,
"x": 16809.65,
"y": 36044.37
}
],
"transfers": []
},
"distance": 372
},
{
"rank": 2,
"station": {
"name": "JURONG EAST",
"code": "NS1 EW24 JE5",
"longitude": 103.7421539,
"latitude": 1.3332951,
"x": 17854.36,
"y": 35054.77,
"line": {
"NSL": 1,
"EWL": 1,
"CGL": 0,
"NEL": 0,
"CCL": 0,
"DTL": 0,
"TEL": 0,
"JRL": 2
},
"operational": 1,
"interchange": 1,
"locations": [
{
"platform": "NS1",
"longitude": 103.7422651,
"latitude": 1.3330741,
"x": 17866.73,
"y": 35030.34
},
{
"platform": "EW24",
"longitude": 103.7422651,
"latitude": 1.3330741,
"x": 17866.73,
"y": 35030.34
}
],
"transfers": [
{
"from": "NSL",
"to": "EWL",
"distance": 0
},
{
"from": "EWL",
"to": "NSL",
"distance": 0
}
]
},
"distance": 1161
},
{
"rank": 3,
"station": {
"name": "BUKIT BATOK",
"code": "NS2",
"longitude": 103.7495558,
"latitude": 1.348992,
"x": 18678.17,
"y": 36790.44,
"line": {
"NSL": 1,
"EWL": 0,
"CGL": 0,
"NEL": 0,
"CCL": 0,
"DTL": 0,
"TEL": 0,
"JRL": 0
},
"operational": 1,
"interchange": 0,
"locations": [
{
"platform": "NS2",
"longitude": 103.7495554,
"latitude": 1.3489914,
"x": 18678.13,
"y": 36790.36
}
],
"transfers": []
},
"distance": 1695
},
{
"rank": 4,
"station": {
"name": "LAKESIDE",
"code": "EW26",
"longitude": 103.7209246,
"latitude": 1.3442249,
"x": 15491.81,
"y": 36263.44,
"line": {
"NSL": 0,
"EWL": 1,
"CGL": 0,
"NEL": 0,
"CCL": 0,
"DTL": 0,
"TEL": 0,
"JRL": 0
},
"operational": 1,
"interchange": 0,
"locations": [
{
"platform": "EW26",
"longitude": 103.7209243,
"latitude": 1.3442242,
"x": 15491.77,
"y": 36263.36
}
],
"transfers": []
},
"distance": 1708
}
],
"accurateAsOf": 1539273600000
}
`$3
javascript
const nearestMRT = getNearestMrt(target, false, 2000)
console.log(nearestMRT.toFlatObjects())
console.log(nearestMRT.toTable())
console.log(nearestMRT.toCSV())
``Sample CSV output