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mbloch/mapshaper

A JavaScript-based tool for editing and transforming geospatial data formats like Shapefile, GeoJSON, and TopoJSON, offering both command-line and interactive web interfaces.

Core Features

Supports multiple geospatial data formats (Shapefile, GeoJSON, TopoJSON, CSV)

Performs essential map making tasks (simplifying, clipping, dissolving, filtering)

Offers both command-line tools and an interactive web interface

Handles large files efficiently, with options for increased memory allocation

Client-side processing in the web UI ensures data privacy

Quick Start

npm install -g mapshaper

Detailed Introduction

Mapshaper is a powerful, JavaScript-based software designed for efficient editing and transformation of various geospatial data formats, including Shapefile, GeoJSON, and TopoJSON. It provides a comprehensive suite of tools for common map-making tasks such as simplifying shapes, editing attributes, clipping, dissolving, and filtering. Available as both a command-line utility and an interactive web interface, Mapshaper prioritizes data privacy by performing all web-based processing directly in the browser. Its robust architecture also supports handling very large datasets, making it an invaluable resource for geospatial data preparation and analysis.