Convert GML to BNA Online - Free & Fast

What is GML?

GML (Geography Markup Language) is the OGC standard XML grammar for encoding geographic features with full coordinate reference system support.

What is BNA?

Atlas Boundaries (BNA) is a simple ASCII coordinate format for storing polygon boundary data, originally developed by Atlas GIS for representing area features like postal codes, sales territories, and administrative regions as coordinate lists.

When Should You Use GML vs BNA?

GML vs BNA: Key Differences

• •GML uses lossless compression while BNA uses lossy compression — this is the fundamental technical difference between the two formats.
• •Moving from GML (lossy) to BNA (lossy) means the output file will be significantly smaller — but at the cost of some visual fidelity.
• •Alpha channel support: BNA handles transparency, so semi-transparent pixels from the source will be lost.
• •GML files are typically Larger than Shapefile due to verbose XML structure while BNA files range 1KB to 50MB depending on boundary complexity
• •Use case fit: GML targets ogc-compliant geospatial data exchange, enterprise gis and BNA targets atlas gis boundary exchange, regional mapping, legacy spatial data conversion — your choice depends on which workflow stage you are serving.

Advantages of GML

• ✓The lossless nature of GML means file sizes stay reasonable while handling OGC-compliant geospatial data exchange, enterprise GIS efficiently.
• ✓From mobile devices to enterprise servers, GML is recognized and supported everywhere.
• ✓The trade-off for GML's perfection is larger files — but for archival work, it is worth every megabyte.
• ✓GML is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Advantages of BNA

• ✓The lossy nature of BNA means file sizes stay reasonable while handling Atlas GIS boundary exchange, regional mapping, legacy spatial data conversion efficiently.
• ✓From mobile devices to enterprise servers, BNA is recognized and supported everywhere.
• ✓Storage and bandwidth costs drop significantly when using BNA thanks to its efficient compression.
• ✓BNA is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Common Use Cases for GML to BNA Conversion

Industry Applications

Best Practices for GML to BNA Conversion

• →For GML to BNA: verify that field name length limits in BNA do not truncate attribute column names
• →Test a subset of features first — especially if the dataset contains mixed geometry types
• →Confirm that multi-part geometries (multi-polygons, multi-lines) remain intact after conversion
• →Check for any required sidecar files (.prj, .shx, .qpj) that the target format needs
• →Validate the converted file using a GIS validation tool before relying on it in production

Troubleshooting GML to BNA Conversion

• !BNA features land in the wrong place after GML to BNA → verify the CRS/projection; mismatched coordinate systems shift geometry
• !Attribute columns missing in BNA → some GIS formats have field name length or type limits; rename or cast columns first
• !GML to BNA drops the z/elevation dimension → pick a target format that supports 3D geometry
• !BNA file won't open in your GIS app → confirm the format version and any required sidecar files (e.g. .prj, .shx) are present

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