Package org.geotools.pmtiles.store

package org.geotools.pmtiles.store
GeoTools DataStore implementation for PMTiles archives containing Mapbox Vector Tiles.

Overview

This package provides a complete GeoTools DataStore implementation for reading PMTiles v3 archives with embedded vector tiles. It enables access to cloud-optimized tile archives from local files, HTTP/HTTPS servers, and cloud storage providers (AWS S3, Azure Blob Storage, Google Cloud Storage).

Architecture

The implementation consists of two main components:

1. PMTiles-Specific Classes

2. Generic Vector Tiles Support

Features

  • Cloud-Optimized Access: Efficient byte-range reads minimize data transfer
  • Multi-Source Support: Local files, HTTP, S3, Azure Blob, Google Cloud Storage
  • Automatic Zoom Selection: Chooses optimal zoom level based on query resolution hints
  • Spatial Filtering: Minimizes tile reads using bounding box extraction
  • CRS Transformation: Native support for coordinate reference system transformations
  • Caching: Configurable in-memory and disk caching for improved performance
  • Thread-Safe: Supports concurrent access from multiple threads

Usage Example


 // Create datastore from S3
 Map<String, Object> params = new HashMap<>();
 params.put("pmtiles", "s3://my-bucket/tiles.pmtiles");
 params.put("io.tileverse.rangereader.caching.enabled", true);
 params.put("io.tileverse.rangereader.caching.blockaligned", true);

 PMTilesDataStore datastore = PMTilesDataStoreFactory.INSTANCE.createDataStore(params);

 // Query features
 String typeName = datastore.getTypeNames()[0];
 SimpleFeatureSource source = datastore.getFeatureSource(typeName);
 Query query = new Query(typeName);
 query.setFilter(BBOX(bbox));
 FeatureCollection<SimpleFeatureType, SimpleFeature> features = source.getFeatures(query);

Configuration Parameters

The datastore supports extensive configuration through PMTilesDataStoreFactory:

Required Parameters

  • pmtiles: URI to the PMTiles archive

Optional General Parameters

  • namespace: Feature type namespace URI
  • io.tileverse.rangereader.caching.enabled: Enable memory caching (default: false)
  • io.tileverse.rangereader.caching.blockaligned: Use block-aligned caching (default: false)
  • io.tileverse.rangereader.caching.blocksize: Cache block size in bytes

Cloud Provider Authentication

Authentication parameters are automatically loaded from the environment or can be explicitly configured:

  • AWS S3: Access key, secret key, region, credential profiles
  • Azure Blob: Account key, SAS token, blob name
  • Google Cloud Storage: Project ID, application credentials

See PMTilesDataStoreFactory for all available parameters.

Performance Optimization

For optimal performance:

  • Enable memory caching for frequently accessed data
  • Use block-aligned caching to align reads with tile boundaries
  • Provide resolution hints (Hints.GEOMETRY_DISTANCE) for automatic zoom level selection
  • Use spatial filters (BBOX) to minimize tile reads

Thread Safety

All classes in this package are designed for thread-safe concurrent access, making them suitable for server environments like GeoServer where multiple requests may access the same datastore simultaneously.

Integration with Tileverse Libraries

This package integrates three Tileverse libraries:

  • tileverse-rangereader: Provides efficient byte-range access to data sources
  • tileverse-pmtiles: Implements the PMTiles format specification
  • tileverse-vectortiles: Handles Mapbox Vector Tile encoding/decoding
  • tileverse-tilematrixset: Manages tile pyramids and coordinate systems
See Also: