Hi developers, yes, RGN5 contains one or more Huffman decoding sections. For the Ile of man map there is only one table with symbol width 32, in a CN Europe NTU tile I find 5 different tables, two with symbol width 8 and three with 32. A lot more to learn here.. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen@hotmail.com> Gesendet: Dienstag, 25. Januar 2022 09:53 An: Development list for mkgmap Betreff: Re: [mkgmap-dev] Embedding raster maps Hi Ticker, yes, that's right. I am working on an implementation, but it will take a while ... The Huffman table in the Ile of man map is probably used to decode the raster image. I has a symbol width of 32. Just starting to learn how it works, GPXSee is a great help but the code is hard to read. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap@jagit.co.uk> Gesendet: Dienstag, 25. Januar 2022 09:45 An: Development list for mkgmap Betreff: Re: [mkgmap-dev] Embedding raster maps Hi Gerd When I looked at this (not very closely) a couple of weeks ago, it seemed as if LBL could be huffman encoded, with ENCODING_FORMAT set to 11, and the decoding table somewhere in RGN Ticker On Tue, 2022-01-25 at 08:10 +0000, Gerd Petermann wrote:
Hi Steve,
if I got that right data in RGN5 is like MDR16, means, it contains Huffman decoding data. At least a lot of bytes look similar and GPXSee also gets the decoding data from it.
Most of the code that displays MDR16 can be used to read RGN5, too.
Gerd
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