windVectors

/**** Start of imports. If edited, may not auto-convert in the playground. ****/
var geometry = /* color: #d63000 */ee.Geometry.MultiPoint();
/***** End of imports. If edited, may not auto-convert in the playground. *****/
// fire features
var fire1 = ee.Geometry.Point(-116.19, 38.75)
var fire2 = ee.Geometry.Point(-105.21, 34.96)
var fire3 = ee.Geometry.Point(-86.84, 44.34)

// fire feature collection
var fires = ee.FeatureCollection([
  ee.Feature(fire1,{}),
  ee.Feature(fire2,{}),
  ee.Feature(fire3,{})
  ])

// see fires on map
Map.addLayer(fires)


function addWindLayer(s, e) {
  if(!s){
    s = '2014-03-01';
  }
  if (!e) {
    e = '2014-03-27';
  }
  var ic = ee.ImageCollection('NASA/NLDAS/FORA0125_H002')
  //.filterDate('2017-03-01', '2017-03-27');
  .select(['wind_u', 'wind_v'])
  .filterDate(s, e);
  
  var wind = ee.Image(ic.first())

  return wind
}

var wind = addWindLayer()
//var layer = Map.addLayer(wind, {min:0,max:10, /*palette: ['FF0000', '0000FF']*/}, 'wind', true, 0.40);

// get wind vectors
function get_wind_vectors(feature) {
  
  var scale = ee.Number(Map.getScale()).multiply(1e-4)
  
  var point0 = feature.geometry()
  var wind_vector = wind.reduceRegion(ee.Reducer.mean(),point0)
  var wind_u = ee.Number(wind_vector.get('wind_u'))
  var wind_v = ee.Number(wind_vector.get('wind_v'))
  var du = wind_u.multiply(scale).add(point0.coordinates().get(0))
  var dv = wind_v.multiply(scale).add(point0.coordinates().get(1))
  var point1 = ee.Geometry.Point(du,dv)
  var wind_line = ee.Geometry.LineString([point0,point1])
  
  return ee.Feature(wind_line,{'wind_u':wind_u,'wind_v':wind_v})
  
}

function get_wind_points(feature) {
  
  var scale = ee.Number(Map.getScale()).multiply(1e-4)
  
  var point0 = feature.geometry()
  var wind_vector = wind.reduceRegion(ee.Reducer.mean(),point0)
  var wind_u = ee.Number(wind_vector.get('wind_u'))
  var wind_v = ee.Number(wind_vector.get('wind_v'))
  var du = wind_u.multiply(scale).add(point0.coordinates().get(0))
  var dv = wind_v.multiply(scale).add(point0.coordinates().get(1))
  var point1 = ee.Geometry.Point(du,dv)
  var wind_line = ee.Geometry.LineString([point0,point1])
  
  return ee.Feature(point1,{'wind_u':wind_u,'wind_v':wind_v})
  
}

var wind_vectors = fires.map(get_wind_vectors)
Map.addLayer(wind_vectors)

var wind_points = fires.map(get_wind_points)
Map.addLayer(wind_points, {color: 'blue'});