The ground-codes package is the core implementation of the Ground Codes coordinate-based addressing system. This package provides the fundamental encoding and decoding functionality that powers the entire Ground Codes ecosystem.

Ground Codes is a coordinate-based addressing system that allows you to pinpoint any location in the world using just a region name and two words (e.g., "Yongsan-Happiness-Smile"). It leverages geographic coordinate systems (GCS) to provide a user-friendly alternative to traditional latitude and longitude coordinates.

npm install ground-codes
# or
yarn add ground-codes
# or
pnpm add ground-codes

Convert geographic coordinates (latitude/longitude) into a human-readable Ground Codes address:

import { encode } from "ground-codes";

// Example: Encode a specific location
const address = await encode(
  { lat: 37.5326, lng: 127.0246 }, // Target coordinates
  {
    regionLevel: 2, // Use region name (default)
    precisionMeters: 3, // 3-meter precision (default)
    language: "English", // English output (default)
  }
);

// Result: "Yongsan-Happiness-Smile" (example)
console.log(address);

Convert a Ground Codes address back to geographic coordinates:

import { decode, findClosestRegion } from "ground-codes";

// First, get the region center point
const region = await findClosestRegion(
  { lat: 37.5326, lng: 127.0246 }, // Approximate location
  { regionLevel: 2 } // Use region name (default)
);

// Then decode the encoded part
const coordinates = decode({
  encoded: "Happiness-Smile", // The encoded part after region name
  center: { lat: region.lat, lng: region.lng },
});

// Result: { lat: 37.5326, lng: 127.0246 } (approximate)
console.log(coordinates);

• 🔤 Simple and Memorable: Just three words to identify any location precisely
• 🌎 Global Coverage: Works anywhere in the world with a unique address
• 📖 Open Source: MIT licensed and fully transparent implementation
• 🌐 Multilingual Support: Currently available in Korean and English, with plans to expand to 60 languages
• 📏 Variable Precision: Offers three levels of precision (3m, 30cm, and 3cm) to suit different use cases

Encodes geographic coordinates into a Ground Codes address.

Parameters:

• target: { lat: number, lng: number } - The target coordinates to encode
• options (optional):
  • center: { lat: number, lng: number } - Custom center point (if not provided, closest region is used)
  • regionLevel: number - Region level (1 = code format, 2+ = name format)
  • precisionMeters: number - Precision in meters (default: 3)
  • language: SupportedLanguage - Output language (default: 'en')

Returns: Promise<string> - The encoded Ground Codes address

Decodes a Ground Codes address back to geographic coordinates.

Parameters:

• encoded: string - The encoded part of the Ground Codes address
• center: { lat: number, lng: number } - The center point coordinates

Returns: { lat: number, lng: number } - The decoded geographic coordinates

Finds the closest region to the given coordinates.

Parameters:

• target: { lat: number, lng: number } - The target coordinates
• options (optional):
  • regionLevel: number - Region level to search for
  • language: SupportedLanguage - Language for region names

Returns: Promise<{ name: string, code: string, lat: number, lng: number }> - The closest region

Ground Codes offers different precision levels through simple syntax changes:

• 🏙️ Yongsan-Happiness-Smile (3m precision) - Standard precision, ideal for general location finding
• 🏢 Yongsan#Happiness#Smile (30cm precision) - Higher precision for detailed navigation
• 📍 Yongsan+Consideration+Happiness+Smile (3cm precision) - Highest precision for exact positioning

Ground Codes uses a custom GIS algorithm called "Grok Spiral" that determines coordinates by moving in a clockwise spiral from a central point. This implementation leverages the "Gauss Circle Problem" formula to achieve O(sqrt N) efficiency in coordinate generation. The spiral pattern maintains a circular shape regardless of distance from the center point, resulting in excellent coordinate indexing efficiency.

This package works seamlessly with other Ground Codes ecosystem packages:

• 🗺️ @repo/geoint: Provides the geographical information database
• 📖 @repo/codebook: Manages the word codebooks used in the encoding system

MIT License