Placemark is a browser-based application for creating, editing, visualising and analysing geospatial data. It combines an interactive map with a table-oriented workflow, making it useful for drawing features by hand as well as cleaning, inspecting and transforming existing datasets.
The application can be used through its hosted instance or self-hosted. Map rendering is handled by MapLibre GL JS, with OpenFreeMap used for the default basemaps. Optional services can add geocoding and route generation.
This is free and open source software.
Key Features
- Imports, converts and exports a wide range of geospatial data formats.
- Draws and edits points, lines and polygons directly on the map with tools designed for precise feature creation.
- Provides algorithmic editing operations such as buffering alongside drawing-based workflows.
- Supports routing as a drawing mode, allowing waypoints to be connected along roads and paths through a configured routing provider.
- Offers a feature table for examining and editing properties, with sortable columns and find-and-replace support.
- Supports multiselect and bulk editing when working with groups of map features.
- Provides category, ramp and uniform symbolisation for styling geographic data.
- Supports H3 cell identifiers in CSV data for workflows based on the H3 hierarchical geospatial index.
- Includes undo and history handling to make interactive editing easier to reverse and refine.
- Can load data through a URL, including GeoJSON supplied directly or referenced remotely.
- Uses MapLibre GL JS for map rendering and supports optional search through a configured geocoding service.
- Can use openrouteservice, Geoapify or OSRM as an optional routing backend.
Website: github.com/placemark/placemark
Support:
Developer: Placemark
License: MIT License
Placemark is written in TypeScript. Learn TypeScript with our recommended free books and free tutorials.
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