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Site Editorial Commentary：Mergin Maps is a QGIS field survey app for data collection even offline

Mergin maps is a robust field data collection tool seamlessly integrated with the free and open-source QGIS, empowering you to efficiently collect, store, and synchronize your geospatial data with your entire team. Say goodbye to the hassles of manual paper notes, georeferencing photos, and transcribing gps coordinates. With Mergin Maps, effortlessly transfer your QGIS projects to a user-friendly mobile app, enabling streamlined data collection and seamless synchronization back to your server.

Mergin Maps stands out as a versatile mobile GIS application meticulously designed to cater to a broad spectrum of field mapping and GIS survey requirements. It is extensively utilized by professionals across diverse industries, including agriculture, telecommunications, fiber optics, construction and engineering, environmental protection, forestry, utilities, and local government and municipalities. Whether your work takes you to remote, disconnected areas or well-connected environments, Mergin Maps ensures efficient, accurate, and collaborative GIS data collection and geospatial dataset management in the field.

Setting up your project with Mergin Maps is incredibly straightforward and takes only a few minutes. Simply create your survey project in QGIS, connect it to Mergin Maps using a dedicated plugin, and synchronize it with the mobile app to immediately commence data collection in the field.

The data you capture during field surveys is visually displayed on a map interface and can be exported to a wide variety of industry-standard formats, including CSV, Microsoft Excel, ESRI Shapefile, Mapinfo, GeoPackage, PostGIS, AutoCAD DXF, and KML.

Mergin Maps equips you with real-time position tracking, intuitive survey forms, and the ability to capture and edit points, lines, or polygons directly in the field. For enhanced precision, you can seamlessly connect external GPS/GNSS devices via Bluetooth for high-accuracy surveying. Enjoy a consistent experience, as map layers maintain the same visual representation as in QGIS desktop, allowing you to define layer symbology on your desktop and have it faithfully reproduced on your mobile device.

Mergin Maps offers comprehensive Offline field data capture capabilities, ideal for scenarios where a data connection is unavailable. It can be configured to utilize either offline or web-based background maps and contextual layers, ensuring uninterrupted data collection regardless of connectivity.

Key advantages of the Mergin Maps sync system:
- eliminate the need for cumbersome cables to transfer data to and from your device.
- Facilitate collaborative working by sharing projects with team members, even in offline environments.
- Intelligently merge updates from multiple surveyors, ensuring data consistency.
- Push data from the field in real-time, enabling immediate access to collected information.
- Benefit from version history and cloud-based backup for secure data management.
- Implement fine-grained access control to protect sensitive data.
- Record essential metadata, including EXIF, GPS, and external GNSS device information, for comprehensive data provenance.
- Seamlessly synchronize with your PostGIS datasets and external media storage solutions such as S3 and MinIO.

Supported field types for forms:
- Text (single or multi-line input)
- Numeric (plain, with +/- buttons, or with slider control)
- Date / time (with convenient calendar picker)
- Photo (capture and embed images directly)
- Checkbox (yes/no selection)
- Drop-down with predefined values (for conTrolled vocabulary)
- Drop-down with values sourced from another table (for relational data entry)