About geobase

Key features of the geobase package:

• 🌐 geographic (longitude-latitude) and projected positions and bounding boxes
• 🧩 simple geometries (point, line string, polygon, multi point, multi line string, multi polygon, geometry collection)
• 📏 cartesian 2D calculations (centroid, polylabel, point-in-polygon, distance).
• 🔷 features (with id, properties and geometry) and feature collections
• 📐 spherical geodesy functions for great circle and rhumb line paths
• 📅 temporal data structures (instant, interval) and spatial extents
• 📃 vector data formats supported (GeoJSON, Newline-delimited GeoJSON, WKT and WKB)
• 🗺️ coordinate projections (web mercator + based on the external proj4dart library)
• 🔢 tiling schemes and tile matrix sets (web mercator, global geodetic)

Other resources

📚 Web APIs: See also the geodata package that extends capabilities of geobase by providing geospatial API clients to read GeoJSON data sources and OGC API Features web services.

🚀 Samples: The Geospatial demos for Dart repository contains more sample code showing also how to use this package!

🛠️ Usage

The package requires at least Dart SDK 2.17, and it supports all Dart and Flutter platforms.

Add the dependency in your pubspec.yaml:

dependencies:
  geobase: ^1.3.0

Import it:

import `package:geobase/geobase.dart`

There are also partial packages containing only a certain subset. See the packages section below.

🚀 Shortcuts to docs

📍 Coordinates

🧩 Simple geometries

📏 Geometry calculations

🔷 Geospatial features

📃 Vector formats

📅 Metadata

🗺️ Projections

📐 Spherical geodesy

🔢 Tiling schemes

📦 Packages

The geobase library contains also following partial packages, that can be used to import only a certain subset instead of the whole geobase package:

Package	Description
common	Common codes, constants, functions, presentation helpers and reference systems related to geospatial applications.
coordinates	Position, bounding box and positions series (with coordinate arrays).
geodesy	Spherical geodesy functions for great circle and rhumb line paths.
geometric	Cartesian 2D calculations (centroid, polylabel, point-in-polygon, distance).
meta	Temporal data structures (instant, interval) and spatial extents.
projections	Geospatial projections (currently only between WGS84 and Web Mercator).
projections_proj4d	Projections provided by the external proj4dart package.
tiling	Tiling schemes and tile matrix sets (web mercator, global geodetic).
vector	Text and binary formats for vector data (features, geometries, coordinates).
vector_data	Data structures for geometries, features and feature collections.

External packages geobase is depending on:

• collection for priority queues and collection utilities
• equatable for equality and hash utils
• meta for annotations
• proj4dart for coordinate projections