Introduction

Geocoder ID is an offline reverse geocoding tool for Indonesia. It converts latitude/longitude coordinates to administrative addresses down to the village (kelurahan/desa) level.

What is Reverse Geocoding?

Reverse geocoding is the process of converting geographic coordinates (latitude and longitude) into a human-readable address. For example:

• Input: -6.2088, 106.8456
• Output: Pasar Manggis, Setiabudi, Jakarta Selatan, DKI Jakarta

Features

Offline First

Once the database is downloaded (~233MB), no internet connection is required. Perfect for:

• Embedded systems
• Air-gapped environments
• Batch processing without API rate limits

Fast Performance

Uses DuckDB with spatial indexing for O(log n) query performance. Typical queries complete in under 10ms.

Complete Coverage

Covers all administrative levels in Indonesia:

Level	Count
Province (Provinsi)	38
Regency (Kabupaten/Kota)	514
District (Kecamatan)	7,277
Village (Kelurahan/Desa)	83,288

Dual Use

• CLI: Download binary and run from terminal
• Go Library: Import and use in your Go applications

Next Steps

• Installation - Install the CLI or Go library
• Quick Start - Get up and running in minutes