# placemark/placemark

A flexible web-based editor, converter, visualization tool, for geospatial data

Repository: https://github.com/placemark/placemark
Canonical: https://ross.abutalabs.com/products/placemark
Homepage: https://placemark.io/
Language: TypeScript
License: MIT
License Family: permissive
Topics: geojson, geospatial, maps
Last push: 2026-08-26T01:40:43+00:00

## Health v2 (maintenance only)
Score: 87/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 80, longevity 71
- inputs: {"age_days": 1001, "days_push": 8, "days_rel": 56, "gap_med": 34, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1451, forks 124 (observed 2026-08-28T04:04:45.737578+00:00)

## What it is
Placemark is a free, open-source web application for creating, viewing, editing, and analyzing geospatial map data, built with MapLibre GL JS. It can be used via the hosted placemark.io instance or self-hosted by developers.

## Use cases
- edit geojson files in the browser
- convert between geospatial data formats
- visualize map data on a basemap
- draw and edit polygons and points on a map
- self-host a geojson editor
- analyze geospatial data interactively

## When to choose
- you need a browser-based editor for GeoJSON and other map formats
- you want an open-source alternative to geojson.io
- you need to convert or visualize geospatial data without installing desktop GIS software

## When to avoid
- you need full professional GIS capabilities like advanced raster analysis or projections
- you need an offline desktop application
- you want a lightweight library to embed map editing in your own app rather than a standalone tool

## Facets
- artifact type: application
- maturity: active
- function: editor, data-visualization, geospatial, web-scraping
- domain: web-development, data-visualization
- platform: self-hosted, cross-platform
- tags: geojson, maplibre, map-editor, gis, converter, typescript, maps, geospatial, web-server, nodejs

## Member repositories
- placemark/placemark (main) score 87

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:45.737578+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:35:52.277859+00:00, confidence not recorded.
  - readme: https://github.com/placemark/placemark (fetched 2026-08-28T04:04:45.737578+00:00, sha 84c196ea4127)
  - homepage: https://placemark.io/ (fetched 2026-08-29T11:45:34.055636+00:00, sha 249152da7d89)
- Data as of 2026-08-30T08:39:29.467469+00:00.