Convert KML to KAP

Understanding kml and kap file formats

KML (Keyhole Markup Language) is an XML-based file format used to display geographic data in mapping applications like Google Earth. It stores points, lines, polygons, and image overlays with geographic coordinates.

KAP files are raster chart files used primarily in marine navigation. They are part of the BSB format, containing georeferenced map images and metadata, and are widely supported by navigation software such as OpenCPN.

Why convert kml to kap?

Converting KML to KAP is useful for mariners and navigators who want to use custom map overlays or routes created in mapping tools (like Google Earth) within marine navigation software that supports KAP charts.

How to convert kml to kap

Direct conversion from KML to KAP is not straightforward, as KML is vector-based and KAP is raster-based. The process typically involves:

1. Exporting the KML data as an image overlay (e.g., a map or chart image).
2. Georeferencing the image to match real-world coordinates.
3. Creating a KAP file from the georeferenced image.

Recommended software for kml to kap conversion

MapCal (part of the OziExplorer suite) is a popular tool for creating KAP files from georeferenced images. Here’s a typical workflow:

1. Use Google Earth to open your KML file and save the map as an image (File → Save → Save Image).
2. Georeference the saved image using MapCal or OziExplorer by assigning real-world coordinates to the image corners.
3. Export the georeferenced image as a KAP file (File → Export Map to BSB/KAP).

Alternatively, QGIS (a free GIS tool) can be used to import KML, export as a georeferenced raster, and then use plugins or external tools to create KAP files.

Summary

While there is no one-click solution for converting KML to KAP, using tools like OziExplorer or QGIS allows you to georeference exported map images and create KAP files suitable for marine navigation.