Convert GML to OSM

Understanding gml and osm file formats

GML (Geography Markup Language) is an XML-based format designed for expressing geographical features. It is widely used in GIS (Geographic Information Systems) for storing and sharing spatial data, including points, lines, and polygons, along with their attributes.

OSM (OpenStreetMap) files are used to store map data for the OpenStreetMap project. The OSM XML format represents geographic features such as roads, buildings, and points of interest, making it essential for mapping and navigation applications.

Why convert gml to osm?

Converting GML to OSM is useful when you want to import GIS data into OpenStreetMap or use it with OSM-compatible tools. This conversion enables seamless integration of spatial data from various sources into the OSM ecosystem.

Best software for gml to osm conversion

The most recommended tool for converting GML to OSM is GDAL/OGR, a powerful open-source library for geospatial data manipulation. The ogr2ogr utility, part of GDAL, supports both GML and OSM formats and allows for efficient conversion.

How to convert gml to osm using GDAL/OGR

1. Install GDAL on your system. It is available for Windows, macOS, and Linux.
2. Open a command prompt or terminal window.
3. Run the following command, replacing input.gml and output.osm with your file names:
   ogr2ogr -f "OSM" output.osm input.gml
4. Check the output.osm file for your converted data.

Alternative converters

• QGIS: Open your GML file in QGIS, then use Project → Import/Export → Export Project to OSM to save as OSM.
• Online converters: Some web-based tools support GML to OSM conversion, but for best results and data integrity, desktop tools like GDAL or QGIS are recommended.

Tips for successful conversion

• Ensure your GML file is valid and well-formed before conversion.
• Review the OSM output for completeness and correct mapping of attributes.
• Consider post-processing in OSM editors like JOSM for further refinement.