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[mkgmap-dev] Memory problems since 1245

From Charlie Ferrero charlie at cferrero.net on Tue Oct 6 19:59:58 BST 2009

Clinton Gladstone wrote:
> On Tue, Oct 6, 2009 at 12:11 PM, maning sambale
> <emmanuel.sambale at gmail.com> wrote:
>> I am interested in this approach as well.  Can you please post the
>> howto for this?
>> In our areas the sea gets broken sometimes due to newbie editing it
>> would be good if I have a permanent sea osm file to create a onetime
>> sea polygon.
> OK. I don't have my files here and I'm about to go on vacation, so
> I'll try to list the steps here from memory:
> 1. Copy the style files to a new directory. Use this for the new
> coastline styles.
> 2. In the new directory, remove everything from the points file,
> remove everything except coastline from the lines file, and remove
> everything except sea (or ocean) from the polygons file. (You might
> have to add a sea polygon; I can't remember.)
> 3. Compile the map with appropriate options to use the coastline style
> files, and to generate sea polygons.
> - Make sure you give the new map a unique family ID, and unique file names.
> - Set draw-priority to a low number (I used 10, I believe).
> - You can leave away a lot of the other options (such as routing) as
> they are not relevant for this map.
> - If your map is small enough, you can run mkgmap on the entire osm
> file instead of splitting it. (I would imagine that the Phillipines
> would be small enough.)
> - Set an appropriate map description, so you can easily recognise the
> coastline map when you install it on your GPSr.
> 4. Wait a while for the map to generate. The generate-sea option
> appears to always take a fair amount of time.
> 5. Install the map you just generated into MapSource/Roadtrip, or save
> it for separate combination into a gmapsup file.
> 6. Compile your regular map. Make sure to set the transparent option,
> and to ensure that the draw priority is higher than the coastline map
> (I think 25 is the default draw priority.)
> - Of course, do not use the generate-sea option here.
> - Also remember to use unique family IDs, map file names, etc.
> 7. Install this map into MapSource/Roadtrip, if you use them.
> 8. Combine the two maps into one gmapsup file on the GPSr, using
> MapSource/Map Install, or use another tool of your choice to create a
> combined gmapsup file.
> Once you install the maps on your device, you can also select and
> deselect the entire maps for display.
> - On an eTrex you can do this by paging to the map setup page.
> - On a Nuvi you can do this by navigating to the map options area.
> As others have mentioned, you can use a similar technique to create
> map overlays with contours or other information. Just compile with an
> appropriate new style file, a higher draw-priority, and the
> transparent option. For example, I have created an overlay for public
> transit in Toronto, Canada which I can turn on and off at will if I
> want to find the nearest subway, tram or bus line.

To make life easier, you could craft an XAPI call just to download the 
coastline for a particular area of interest (makes the OSM file much 
smaller so more likely that you'll have enough memory to process it). 
I've been trying with
-O UK_coastline.osm

but it doesn't seem to work.  Does anyone have any experience of XAPI 
and know where I'm going wrong?

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