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Old 07-09-2019, 04:21   #1
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Join Date: Jan 2019
Location: Netherlands
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Converting PNG files to KAP files for usage in OpenCPN

Hello,

Last winter, I switched over from SeaClear to OpenCPN.
I did create my own maps, using MobAC, which delivers PNG files and coordinates.
Combining the PNG file with coordinates, I did create WCI files, using the SeaClear MapCal application.
These MapCal WCI-files were then converted to KAP-files.

This whole process was working fine, until I did try to use files which do require a higher color-depth (Google-satellite-256 mapsource).
Then I did discover that MapCal creates WCI files, only using an 8-bit color depth. Creating atlases, based on Google-satellite data, however requires 32-bit color-depth.

Based on that, I do have the following questions:
  1. Is there anyone, who knows, if MapCal can create WCI-files with 32-bit color depth??
  2. Or is there another conversion utility, which can combine PNG files with coordinates, and has the possibility of exporting KAP-files??
  3. Does anyone know, or have a procedure, where MobAC exports KAP-files directly?

My PNG-files are created with MobAC, but that has no direct KAP-export capacity.

Thanks on forehand.
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Old 07-09-2019, 04:40   #2
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Location: Probably in an anchorage or a boatyard..
Boat: Ebbtide 33' steel cutter
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Re: Converting PNG files to KAP files for usage in OpenCPN

Can't help with MoBac but you can create Mbtiles directly from sasPlanet, of navionics, cmap or a few satellite sources.

http://www.cruisersforum.com/forums/...ml#post2860707

Opencpn V5 can read mbtiles.
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Old 07-09-2019, 05:44   #3
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Re: Converting PNG files to KAP files for usage in OpenCPN

Take a look at Mobac_Convert



That's what you need.
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Old 07-09-2019, 06:46   #4
bcn
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Re: Converting PNG files to KAP files for usage in OpenCPN

imgkap
https://github.com/nohal/imgkap

Nohal is developer of OpenCPN.

We are using Imgkap for the creation of the upcoming oeRNC raster charts for OpenCPN with either png or tiff raster files as source.
You will nee the px/py coords, the lat/lon reference of the charts and in case a polygon of several x/y pixel points for non-rectangular shapes.
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