flutter pub add dart_geohash根據套件公開資料產生的選型評估，僅供參考。
一個輕量級的 Dart 套件，用於將地理座標編碼和解碼為 geohash，以及尋找鄰近的 geohash。透過將緯度和經度對轉換為緊湊的字串表示，該套件實現了高效的空間索引和鄰近查詢。此套件支援所有主要平台，非常適合需要快速地理空間運算的應用程式，例如基於位置的服務或地圖群集。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
GeoHash is a simple way of storing a latitude/longitude location as a simple string.
Includes a Class for encode/decode and finding neighbors as well as a Class that can be given a location and will contain all needed information for that GeoHash.
// Create a simple geohash from a given string
GeoHash myHash = GeoHash("9yf0zhhtj");
// Immediately be able to get all other information related to it
myHash.geohash;
myHash.longitude();
myHash.latitude(decimalAccuracy: 4);
myHash.neighbors; // Returns a Map with itself and 8 surrounding neighbors
myHash.neighbor(Direction.NORTH);
// You can also create it from a specific lon/lat
GeoHash myOtherHash = GeoHash.fromDecimalDegrees(-98.1235, 38.1234);
// Separately you can use only the Geohasher functions
GeoHasher geoHasher = GeoHasher();
geoHasher.encode(-98, 38); // Returns a string geohash
geoHasher.encode(-98, 38, precision: 6) // Returns string geohash with length
geoHasher.decode("9yf0zhhtj"); // Returns decimal longitude/latitude
geoHasher.neighbors("9yf0zhhtj"); // Returns itself and 8 neighbors as a Map
Based on the Python Package Mapzen GeoHash