Convert BNA to TAB 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 TAB?

MapInfo TAB is the native read/write format for MapInfo Professional, storing vector layers with geometry, attributes, styling rules, and projection information in a set of files that together form a complete map layer.

When Should You Use BNA vs TAB?

BNA vs TAB: Key Differences

• •The core technical difference: BNA relies on lossy compression whereas TAB uses lossless compression.
• •Converting from BNA to TAB changes compression type: lossless source becomes larger but with full quality preservation.
• •Transparency: N/A - proprietary multi-file format
• •BNA files are typically 1KB to 50MB depending on boundary complexity while TAB files range 10KB to 2GB depending on layer complexity
• •Use case fit: BNA targets atlas gis boundary exchange, regional mapping, legacy spatial data conversion and TAB targets mapinfo gis projects, cadastral mapping, desktop spatial analysis — your choice depends on which workflow stage you are serving.

Advantages of BNA

• ✓BNA applies lossy compression specifically calibrated for Atlas GIS boundary exchange, regional mapping, legacy spatial data conversion.
• ✓BNA enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓BNA delivers impressive compression ratios, shrinking files dramatically while keeping visual quality high.
• ✓You will find BNA support built into virtually every tool that handles Atlas GIS boundary exchange, regional mapping, legacy spatial data conversion — no plugins or converters needed.

Advantages of TAB

• ✓TAB applies lossless compression specifically calibrated for MapInfo GIS projects, cadastral mapping, desktop spatial analysis.
• ✓TAB enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓TAB guarantees every bit of the original data survives — no approximations, no shortcuts.
• ✓You will find TAB support built into virtually every tool that handles MapInfo GIS projects, cadastral mapping, desktop spatial analysis — no plugins or converters needed.

Common Use Cases for BNA to TAB Conversion

Industry Applications

Best Practices for BNA to TAB Conversion

• →When converting BNA to TAB: confirm the coordinate reference system (CRS / projection) is preserved or explicitly reprojected
• →Keep attribute tables and feature metadata intact — TAB should retain all fields from BNA
• →Check geometry types (point, line, polygon) map cleanly between the two formats
• →Verify that z/elevation values and topology survive the conversion when working with terrain data
• →Always keep a backup of your original files before converting
• →Choose the appropriate quality settings for your specific use case

Troubleshooting BNA to TAB Conversion

• !Topology errors in the converted TAB → self-intersecting polygons or duplicate vertices may not transfer cleanly between formats
• !The TAB file coordinate values shifted slightly → datums (WGS84 vs NAD83) differ even when the projection looks similar
• !Time field values were corrupted after converting BNA to TAB → date and time field formatting varies across GIS formats
• !Null geometry features appear in the converted TAB → empty or null-shape records in BNA may cause validation errors in some formats

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