Projects sharing features with Mapshaper

TopoJSON is a topological geographic data format and a set of tools that convert standard GeoJSON into a more compact representation. It reduces file size by encoding shared boundaries between adjacent features as reusable arcs, eliminating duplicate boundary coordinates and preserving the spatial relationships between map regions. The format achieves compression through several encoding techniques. Arc-sharing compression lets neighboring polygons reference a single arc, while coordinate quantization maps geographic coordinates to a fixed integer grid, reducing floating-point precision overh

GDAL is an MIT-licensed open source translator library that provides a unified abstract data model for reading and writing geospatial raster and vector data across hundreds of file formats. It serves as a foundational geospatial data translation library, enabling access to diverse geospatial data formats through a single, consistent interface. The library exposes its core functionality through command-line utilities that allow users to translate, convert, and process geospatial data between formats. A coordinate transformation engine handles conversions between spatial reference systems, whil

Tablib is a Python library designed for importing, exporting, and manipulating tabular datasets. It functions as a multi-format data converter and manager, allowing users to move information between different file standards. The library supports data transformation across CSV, JSON, YAML, and Excel formats. It provides a programmatic interface to manage these datasets by adding rows, filtering columns, and segregating records. The system uses a common internal representation and adapter-based mapping to normalize diverse input sources. This allows for consistent reading and writing routines

Danfo.js is a data analysis and preprocessing library for JavaScript that provides high-performance labeled data structures. It implements data frames and series to enable complex data analysis, statistical computing, and the manipulation of structured tabular data. The project serves as a machine learning preprocessing library, offering utilities for categorical label encoding, one-hot encoding, and numeric feature scaling and standardization. It specifically facilitates the conversion of labeled data structures into tensors for model training and evaluation. The library covers a broad set

maptalks.js is a JavaScript map rendering library and web map interaction framework used to render interactive 2D and 3D geographic data on a web canvas. It functions as a 3D geospatial engine supporting 3DTiles and GLTF formats, a GeoJSON visualization tool, and a spatial analysis library. The project distinguishes itself through high-performance rendering and dynamic geospatial animation, including the ability to simulate traffic flow and execute smooth visual transitions for map elements. It provides comprehensive tools for interactive geometry editing, allowing users to draw and modify ve

TorchGeo is a PyTorch library designed for deep learning on geospatial data, providing a framework for building and training neural networks for tasks such as semantic segmentation, object detection, and change detection. It serves as a comprehensive pipeline for remote sensing, featuring specialized dataset loaders and multispectral image preprocessing tools. The library is distinguished by a dedicated remote sensing model zoo and extensive support for transfer learning, allowing users to integrate pre-trained weights optimized for specific satellite sensors. It also includes support for sel

Dasel is a multi-format data processor and structured data query tool used for querying, editing, and converting data across JSON, YAML, TOML, and XML. It functions as a universal data converter and a cross-format configuration editor that allows users to interact with various serialization formats through a single unified interface. The tool provides a selector-based interface for extracting and searching nested values and modifying keys and values across different file types. It enables the transformation of data between supported structures to change file types while preserving the origina

GeoPandas is a Python library that extends pandas with native support for geospatial data. It treats geographic geometries—points, lines, and polygons—as a first-class column type within DataFrames, enabling users to store, manipulate, and analyze vector spatial data alongside traditional tabular attributes. The library is built on top of proven geospatial components: it uses Shapely for all geometric operations, Fiona and GDAL for reading and writing standard spatial file formats, PyProj for coordinate reprojection, and an R‑tree spatial index (from Shapely) to accelerate spatial queries. Wh

Turf is a JavaScript and TypeScript geospatial analysis library and toolkit used for performing spatial analysis and geometric operations on GeoJSON data. It functions as a modular spatial engine that allows for the generation, manipulation, and classification of geographic datasets within web and node environments. The library provides a set of utility functions to programmatically create structured points, lines, and polygons. It enables the calculation of distances, areas, and geometric relationships between geographic coordinates, supporting both browser-based geospatial analysis and clie

Cesium is a JavaScript library designed for rendering high-precision 3D globes and 2D maps within web browsers. It functions as a visualization engine that leverages hardware-accelerated graphics to display complex geographic data, terrain, and imagery. The library distinguishes itself through a modular architecture that supports the streaming of massive geographic datasets. By employing tiled data delivery and hierarchical level-of-detail optimization, it maintains performance while navigating large-scale environments. It also includes a time-dynamic state management system, which synchroniz

Mapnik is a cartographic rendering library and map rendering engine designed to convert geographic information system data into visual maps and printable layouts. It serves as a spatial data visualization tool that applies symbology and styling rules to diverse geographic data sources. The project utilizes an XML map configuration framework to define the visual appearance of maps, allowing the separation of styling logic and layout properties from the core rendering engine. Its capabilities cover geographic information visualization and cartographic style management. The system integrates sp

QGIS is a professional, open-source desktop geographic information system designed for the creation, editing, visualization, and analysis of complex spatial data. It functions as a comprehensive environment for managing vector, raster, and point cloud datasets, providing the tools necessary to perform coordinate transformations, georeferencing, and geographic calculations. The platform distinguishes itself through a modular architecture that supports deep system integration via third-party plugins and a hybrid runtime that combines high-performance compiled code with an interpreted scripting

This project is a cross-platform mapping SDK and hardware-accelerated rendering engine implemented in C++. It provides a shared geospatial core that allows for the embedding of interactive maps into Android, iOS, macOS, Node.js, and Qt applications. The system focuses on high-performance vector tile rendering using OpenGL and GPU primitives to display interactive 3D landscapes and complex geospatial datasets. It transforms compressed protocol buffers into customizable visuals through a style-driven layer pipeline. The capability surface extends to comprehensive location services, including g

Dawarich is a self-hosted location history manager and travel journaling platform. It functions as a personal travel archive that collects GPS coordinates and movement data, providing a private alternative to proprietary tracking services. The system utilizes a PostgreSQL geospatial database to store coordinates, visits, and custom geofence boundaries. The project distinguishes itself as a geospatial data converter and visualization tool, capable of transforming location history between formats such as GPX, KML, and GeoJSON. It allows users to organize GPS tracks and geotagged photos into nam

Proton Native is a cross-platform desktop framework that compiles React code into native applications for Windows, macOS, and Linux. It enables developers to build desktop applications using the same component syntax and patterns as React Native, with the ability to reuse existing React Native components with minimal modifications. The framework integrates a flexbox layout engine for positioning native desktop widgets and embeds the Node.js runtime for direct filesystem and system-level access. The framework translates React component trees into native desktop widgets through a bidirectional

This project is a SQL database abstraction layer that provides a consistent object-oriented interface for interacting with multiple relational database systems. It includes a driver wrapper to standardize connections and result sets, a fluent query builder for constructing portable SQL statements, and a type mapper for converting database-specific data types into native application types and vice versa. The library enables programmatic schema management through a schema manager that can introspect database metadata, model structures as objects, and generate the SQL required to migrate between

isomorphic-fetch is a cross-runtime fetch API and isomorphic HTTP client that provides a standardized request interface across different JavaScript environments. It functions as a WHATWG fetch polyfill, ensuring that network request logic behaves identically in both web browsers and Node.js. The project enables universal JavaScript development by allowing a single codebase to perform HTTP requests without environment-specific code. It integrates the fetch interface into Node.js and supports application bundling for the browser.

imewlconverter is an input method editor wordlist converter and format transformer designed to migrate user dictionaries and phrase lists between different software environments. It functions as a cross-platform dictionary migrator, translating proprietary binary and text wordlists for use across Windows, macOS, and mobile systems. The tool standardizes diverse lexicon formats, such as WL, FIT, DCTX, LD2, and QPYD, into common structures to ensure cross-platform compatibility. It specifically handles binary wordlist extraction and the transformation of custom phrase lists for systems includin

Xan is a command-line tool and data transformation engine for processing CSV, TSV, and JSONL datasets. It functions as a processor for compressed files, enabling random access and seeking within gzipped and Zstd files, and serves as a converter for specialized bioinformatics data formats. The tool handles large datasets without requiring full memory loads by utilizing stream-based processing. It provides capabilities for merging, sorting, and deduplicating massive files, as well as converting data between various tabular formats. The project covers a broad range of data wrangling and analysi

NodeGUI is a framework for building native desktop applications using Qt6 widgets, controlled entirely from JavaScript and Node.js. It provides a Qt6 Node.js binding that maps native widget classes to JavaScript objects, enabling developers to create cross-platform desktop apps for Linux and Windows with full access to the Node.js ecosystem and npm modules. The framework distinguishes itself by allowing developers to style native desktop widgets with CSS and Flexbox layout rules, without relying on a web browser. It translates CSS properties and Flexbox layout into Qt stylesheet and layout ma

GeoServer is an open-source geospatial data manager and publisher that shares, edits, and processes geographic information using open standards. It operates as an OGC geospatial server and web map service provider, delivering spatial data and calculated measurements to client applications via standardized web protocols. The platform enables the publishing of geospatial datasets from various file formats to web services and supports the modification and management of spatial datasets through a central server. It provides capabilities for remote spatial processing and the creation of searchable

This project is a collection of reference implementations and sample applications for desktop software development using Electron. It provides cross-platform boilerplates and practical code examples that demonstrate how to integrate web technologies with native operating system APIs. The repository serves as a feature showcase for implementing native system integrations, such as local file system access, process management, and custom window framing. It includes demonstrations for specialized capabilities like network request interception via service workers, screen and window capture, and th

Fern is a toolset for managing API specifications, generating type-safe client libraries, and producing hosted developer documentation. It provides a utility for validating, transforming, and exporting API definitions into standardized OpenAPI formats, serving as a system to maintain a consistent source of truth for API designs. The project differentiates itself through an automated SDK distribution pipeline that publishes generated libraries to package managers such as npm, PyPI, Maven, and NuGet. It also includes an AI-powered search assistant trained on API and SDK specifications to answer

Brush is a tool for creating high-fidelity three-dimensional scene reconstructions from posed images using Gaussian splatting. It processes photographs with known camera coordinates to generate spatial geometry. The project includes capabilities for refining reconstructions through 3D scene masking, which allows for the exclusion of specific image regions or the incorporation of transparency during the training process. The system provides a command line interface for managing the training pipeline and debugging workflows. Visualization is handled via client-side WebGL rendering, which supp

omni-tools is a browser-based utility suite that provides client-side tools for manipulating PDFs, media files, and data formats. It functions as a collection of web-based processors and calculation engines that execute directly within the browser without requiring server-side processing. The suite includes a client-side PDF editor for merging, splitting, and reorganizing document structures, and a web-based media processor for resizing, trimming, and converting image and video files. It also features a data format converter that transforms structured information between JSON, CSV, and XML fo

geemap is a Python library and geospatial toolkit designed for interactive mapping, remote sensing visualization, and satellite imagery analysis. It serves as a Python interface for Google Earth Engine, enabling users to manage cloud-based geospatial workflows and visualize datasets within notebook environments. The project distinguishes itself through automated code conversion, allowing scripts and notebooks to be translated between programming languages. It also provides specialized remote sensing visualization capabilities, such as generating time-lapse GIFs from imagery sequences with sup

Unified is a syntax tree processing engine and content ecosystem designed to parse, transform, and serialize text content. It functions as a plugin-based content pipeline that converts raw text into structured abstract syntax trees using plain JavaScript objects for programmatic inspection and modification. The project distinguishes itself through a modular architecture that enables cross-ecosystem translation, allowing syntax trees to be converted between different specifications such as HTML and Markdown. It utilizes a system of immutable processor cloning and shared state containers, ensur