Convert BNA to GML Online - Free & Fast

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.

What is GML?

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

When Should You Use BNA vs GML?

BNA vs GML: Key Differences

• •BNA uses lossy compression while GML uses lossless compression — this is the fundamental technical difference between the two formats.
• •Moving from BNA (lossless) to GML (lossless) means the output file will be larger — but every bit of the original is preserved.
• •How transparency is handled: GML supports transparency, so alpha information is preserved during conversion.
• •Storage footprint: 1KB to 50MB depending on boundary complexity for BNA vs Larger than Shapefile due to verbose XML structure for GML.
• •Use case fit: BNA targets atlas gis boundary exchange, regional mapping, legacy spatial data conversion and GML targets ogc-compliant geospatial data exchange, enterprise gis — your choice depends on which workflow stage you are serving.

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.

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.

Common Use Cases for BNA to GML Conversion

Industry Applications

Best Practices for BNA to GML Conversion

• →For BNA to GML: verify that field name length limits in GML 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 BNA to GML Conversion

• !GML features land in the wrong place after BNA to GML → verify the CRS/projection; mismatched coordinate systems shift geometry
• !Attribute columns missing in GML → some GIS formats have field name length or type limits; rename or cast columns first
• !BNA to GML drops the z/elevation dimension → pick a target format that supports 3D geometry
• !GML 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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