Hi Mike, quite a lot of missunderstandings ;) 1) The data in land-polygons-split-4326.zip is calculated (compiled) from OSM coastline data. AFAIK the same data is used by the renderer of https://www.openstreetmap.org Find more details here https://osmdata.openstreetmap.de/data/land-polygons.html The expected avantage is that the coastline data produced by them is complete and correct (no gaps, no reversed coastline) 2) The data in sea.zip uses the OSM pbf format. It containes the result of processing this (hopefully correct) data using the algorithm that is used with --generate-sea=multipolygon. That's also a reason why it is called pre-compiled. 3) You should load the data of a rather small sea*.pbf file into JOSM to sea what it contains. You'll sea the result of "cutting out holes(islands) of a multipolygon". So, the file contains only simple ways, no multipolygons.
If you don't want or cannot use precompiled sea data you should try the sub options of --generate-sea. Gerd PS: See also my trick regarding testing sea: http://gis.19327.n8.nabble.com/precomp-sea-problem-tp5953261p5953281.html ________________________________________ Von: Mike Baggaley <[email protected]> Gesendet: Donnerstag, 30. Januar 2020 00:24 An: 'Gerd Petermann'; 'Development list for mkgmap' Betreff: RE: [mkgmap-dev] precompiled sea Hi Gerd, having now read your link on generating sea yourself, I gather that mkgmap cannot produce precompiled sea from OSM files, only from ESRI files. I also wasn't aware that optional code had to be included to use the sea generator. I could include the optional code in my mkgmap build, but it looks like using precompiled sea is a non-starter for me if it can't read OSM data. The original source of my land/sea border was ESRI, but this data has gone through a filtering process and been converted to OSM format. I had assumed that the precompiled sea tiles were in img format, but from opening the precompiled sea zip file from the download page, I see the files are pbf, suggesting that 'precompiled' is something of a misnomer if they are just OSM files. I assume it refers to converting from ESRI to OSM, which I don't need, as it looks like it is doing something pretty similar to what I already have. Ah well, back to the drawing board... Cheers, Mike -----Original Message----- From: Gerd Petermann [mailto:[email protected]] Sent: 29 January 2020 20:12 To: Development list for mkgmap <[email protected]> Subject: Re: [mkgmap-dev] precompiled sea Hi Mike, if you want to compile your own sea.zip see https://wiki.openstreetmap.org/wiki/Mkgmap/help/options#Using_precompiled_se a If you want to create a map similar to that created with java -jar mkgmap.jar --generate-sea=multipolygon --style-file=styles\coastline -c template.args you have to use something like java -jar mkgmap.jar --precomp-sea=\osm\sea.zip --style-file=styles\coastline -c template.args Gerd ________________________________________ Von: mkgmap-dev <[email protected]> im Auftrag von Gerd Petermann <[email protected]> Gesendet: Mittwoch, 29. Januar 2020 20:22 An: Development list for mkgmap Betreff: Re: [mkgmap-dev] precompiled sea Hi Mike, not sure what you are trying to do. What do you expect to get with the last command? Gerd ________________________________________ Von: mkgmap-dev <[email protected]> im Auftrag von Mike Baggaley <[email protected]> Gesendet: Mittwoch, 29. Januar 2020 19:20 An: 'Development list for mkgmap' Betreff: [mkgmap-dev] precompiled sea Hi, I have not used precomp sea before and am struggling to compile the sea tiles. Using the following process I get a map with no sea: Used osmfilter to extract just the coastline data Used splitter on the coastline data Used mkgmap on the splitter data with a simple style that just processes coastline and with --generate-sea=multipolygon. I can see some img files created in my sea folder Used splitter again on the original data Used mkgmap again with --precomp-sea and --generate-sea=multipolygon Am I doing something wrong? Regards, Mike _______________________________________________ mkgmap-dev mailing list [email protected] http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev _______________________________________________ mkgmap-dev mailing list [email protected] http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev _______________________________________________ mkgmap-dev mailing list [email protected] http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
