Convert MID to BSB

Understanding MID and BSB file formats

MID files, or MapInfo Interchange Format files, are used to store geographic data, typically in conjunction with a MIF (MapInfo Interchange Format) file. The MID file contains attribute data, while the MIF file contains the spatial data. These files are commonly used in GIS (Geographic Information Systems) for exchanging map data between different software.

BSB files are raster chart files used primarily for nautical navigation. The BSB format, developed by Maptech, is widely used for storing electronic navigational charts (ENCs) and is supported by many marine navigation applications. BSB files contain raster images of charts along with georeferencing information.

Why convert MID to BSB?

Converting MID to BSB is necessary when you need to use vector-based GIS data (from MID/MIF) in marine navigation systems that require raster chart formats like BSB. This conversion is not straightforward, as it involves transforming vector data into a raster image and then encoding it in the BSB format with proper georeferencing.

How to convert MID to BSB

There is no direct one-step converter from MID to BSB. The process typically involves two main steps:

1. Convert MID/MIF to a raster image (such as TIFF or PNG) using GIS software.
2. Convert the raster image to BSB format using specialized charting tools.

Recommended software for conversion

• QGIS: An open-source GIS application that can open MID/MIF files and export map views as raster images. Use Project → Import/Export → Export Map to Image to save your map as a raster file.
• MapCal (by Maptech): A tool for converting raster images (like TIFF) into BSB format. Import your raster image and use the calibration tools to georeference and export as BSB.

Step-by-step conversion process

1. Open your MID/MIF files in QGIS.
2. Style and adjust your map as needed.
3. Export the map as a raster image using Project → Import/Export → Export Map to Image.
4. Open the exported raster image in MapCal or a similar BSB chart creation tool.
5. Calibrate the image by assigning geographic coordinates to reference points.
6. Export the calibrated chart as a BSB file.

Tips for successful conversion

• Ensure your MID/MIF data is properly georeferenced before exporting to raster.
• Choose a high resolution for the raster export to maintain chart clarity.
• Carefully calibrate the raster image in the BSB creation tool for accurate navigation.

Conclusion

While there is no direct MID to BSB converter, using QGIS and MapCal in combination provides a reliable workflow for transforming vector GIS data into navigational BSB charts.