func NewCoordNode(latitude, longitude float64, precision int) *CoordNode {
ghash, _ := geohash.Encode(latitude, longitude, precision)
return &CoordNode{
Latitude: latitude,
Longitude: longitude,
Geohash: ghash,
}
}
func (this *Nearest) AddCoord(key string, latitude, longitude float64) {
ghash, _ := geohash.Encode(latitude, longitude, this.precision)
coordNode := &CoordNode{
Latitude: latitude,
Longitude: longitude,
Geohash: ghash,
}
this.AddCoordNode(key, coordNode)
}
func groupPoints(f *uatparse.UATFrame) map[string][]uatparse.GeoPoint {
// Index all of the points by GeoHash. Group points together.
res := make(map[string][]uatparse.GeoPoint)
precision := 5 // 6 maybe, 0.000687.
for _, p := range f.Points {
hash, _ := geohash.Encode(p.Lat, p.Lon, precision)
if r, ok := res[hash]; ok {
r = append(r, p)
res[hash] = r
} else {
res[hash] = []uatparse.GeoPoint{p}
}
}
return res
}