[mkgmap-dev] type numbers , again...From nwillink osm at pinns.co.uk on Wed Sep 24 12:06:37 BST 2014
So far I 've gathered that when subtype has 0x80 set no lbl pointers are given ; instead if byte 7 >&EF , ie F0 or F1 then byte 8 and 7 contain an algo for calculating the size of label that follows terminated by 0. This is followed by 3 bytes which determine the length of the information stream , depending, possibly, on the 8th bit being set . It's still a mystery: btw 0x 40 flag when set always add an extra 3 bytes Perhaps like you , I have no idea what all these bytes mean. Nick On 24/09/2014 10:39, Steve Ratcliffe [via GIS] wrote: > On 24/09/14 07:31, nwillink wrote: > > To me this is what I expected looking at various NT imgs. > > It might mean that POIs do have a maximum of 1FF only if 7th bit of > subtype > > is not set? > > I don't know much about extended types. The mkgmap code says this for > extended points: > > * type is written first, then subtype. > * type has no flags so its possible range is 0x0 to 0xff > * subtype has two flags: > * 0x20 - has a label > * 0x80 - has extra bytes after the label (describes marine buoy > lights etc) > so the possible subtype range is 0-0x1f (as expected) > * There are no flags on LBL offset. > > Of course there may be other flags we don't know about and > the possible range may not be fully utilised by any device. > > ..Steve > _______________________________________________ > mkgmap-dev mailing list > [hidden email] </user/SendEmail.jtp?type=node&node=5818312&i=0> > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev > > > ------------------------------------------------------------------------ > If you reply to this email, your message will be added to the > discussion below: > http://gis.19327.n5.nabble.com/type-numbers-again-tp5818050p5818312.html > To unsubscribe from type numbers , again..., click here > <http://gis.19327.n5.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=5818050&code=b3NtQHBpbm5zLmNvLnVrfDU4MTgwNTB8MTM1NTM3MTE1MQ==>. > NAML > <http://gis.19327.n5.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > -- View this message in context: http://gis.19327.n5.nabble.com/type-numbers-again-tp5818050p5818321.html Sent from the Mkgmap Development mailing list archive at Nabble.com. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20140924/5a2d6e84/attachment.html>
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