[mkgmap-dev] How to create a map covering Fiji & Samoa?From GerdP gpetermann_muenchen at hotmail.com on Sun Mar 4 14:01:18 GMT 2012
Hi Colin, your are right, it's not the IDL, but the 180-degree longitude. splitter and mkgmap are internally using integer values to represent the latitude and longitude values. Longitude -180 is represented by -8388608, and +180 is reprensented by 8388608. So, the integer values are very different, but -180 and +180 are - afaik - exactly the same. A lot of comparison are done with something like if (lat > maxlat)... and I think a lot of them will fail. Gerd Colin Smale-2 wrote > > Gerd, > > I have no idea how to answer your question, but I was wondering if it is > really connected to the IDL or the 180-degree longitude? Of course > 179.99 East is separated from 179.99 West by only 0.02 degrees, not > 359.98. I can imagine how this would need some special handling. The IDL > wanders around quite a bit, roughly centred on 180. If the issue really > is connected to the IDL, I would love to learn how! > > Colin > > On 04/03/2012 11:09, GerdP wrote: >> Hi, >> >> while optimizing splitter and mkgmap I did never see special code to >> handle bounding boxes that cover the date limit. >> I wonder if I have to test that case? >> >> In other words: What are the steps to create >> a map covering e.g. Fiji and Samoa? >> Are features like routing expected to work? >> >> Gerd >> >> >> -- >> View this message in context: >> http://gis.19327.n5.nabble.com/How-to-create-a-map-covering-Fiji-Samoa-tp5535019p5535019.html >> Sent from the Mkgmap Development mailing list archive at Nabble.com. >> _______________________________________________ >> mkgmap-dev mailing list >> mkgmap-dev at .org >> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev > > _______________________________________________ > mkgmap-dev mailing list > mkgmap-dev at .org > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev > -- View this message in context: http://gis.19327.n5.nabble.com/How-to-create-a-map-covering-Fiji-Samoa-tp5535019p5535258.html Sent from the Mkgmap Development mailing list archive at Nabble.com.
- Previous message: [mkgmap-dev] How to create a map covering Fiji & Samoa?
- Next message: [mkgmap-dev] How to create a map covering Fiji & Samoa?
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
More information about the mkgmap-dev mailing list