MapChecking
Operator: Anthony Catel
Estimates the maximum number of people in a marked area. The assumed crowd density can be adjusted.
Image, Video & Geo
Product
MapChecking by Anthony Catel, an open tool for estimating crowd sizes on maps.
Availability and source date
Active
As of: 16 October 2026.
No functionality test has been performed.
Use in OSINT research
Helps assess claims about crowd sizes using the available area and an assumed crowd density.
Queries
| Input | Result | Result type |
|---|---|---|
| Place name + Coordinates | Area of the marked region and calculated crowd capacity at the selected density. | Derived |
Features
- Mark an area as a polygon on the map.
- Calculate the area in square metres.
- Estimate the possible number of people using a selected density.
- Compare different density assumptions.
- Share map views and marked areas through a link.
Categories
- Image, Video & Geo
- Maps & satellite imagery
Coverage
Dataset
No proprietary dataset of people or events. The calculation uses drawn areas and selected density values; the base map comes from Google Maps.
Access
Installation and deployment
Website · Locally installable · Self-hosted
Public web application or self-hosted static website. The repository describes a local development server and build; Google Maps remains an external service.
Requirements
The web interface is accessible without signing in. According to the repository, self-hosting requires a Google Maps API key.
Export
Shareable link to the map view and marked areas. File export is not described on the product page or in the README.
Provider
Anthony Catel
Country of establishment
Unknown
Interfaces
No API, MCP or AI integration is documented.
Maintenance
Licence
MIT
Latest activity
Commit 12/2025
Stars
168 (as of 16 October 2026)
Legal note
Limitations
- The output is a capacity estimate, not a count of people actually present.
- According to the provider, uniformly dense crowds are rare; excessively high density assumptions overestimate the number of people.
Guides and practical reports
Official · MapChecking: Features and self-hosting
Anthony Catel · EN
Explains area and density calculations and installation.