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author | Ilya Zverev <zverik@textual.ru> | 2015-10-01 17:03:22 +0300 |
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committer | Ilya Zverev <zverik@textual.ru> | 2015-10-03 00:25:25 +0300 |
commit | f541ce348914d893082c7fe7e20619b4f081a9ee (patch) | |
tree | e03109273f83d8b217a22cad53b33b2eb3013dcc /docs | |
parent | e08126aec0b1a8b3662b29170be963452036b28b (diff) |
[docs] Started writing MWM.md
Diffstat (limited to 'docs')
-rw-r--r-- | docs/MWM.md | 108 |
1 files changed, 106 insertions, 2 deletions
diff --git a/docs/MWM.md b/docs/MWM.md index 2fd12a2b95..7da70f9a28 100644 --- a/docs/MWM.md +++ b/docs/MWM.md @@ -1,11 +1,115 @@ # MWM Files +MAPS.ME uses maps in its own vector format, MWM. It contains classified features sorted and simplified by zoom level. +For car routing, it needs a separate routing index in a `.mwm.routing` file. We build maps for the entire planet: + +* [daily.mapswithme.com/direct/latest](http://direct.mapswithme.com/direct/latest/) - official maps bundled with releases. + ## Building -### Single region +For building maps, you need compiled Generator Tool and, for routing indices, OSRM backend. +See [INSTALL.md](INSTALL.md) for compilation instructions. We usually use this line: + + CONFIG=gtool omim/tools/unix/build_omim.sh -cro + +Scripts described here require OSM C Tools, which are maintained as a submodule of the omim repository. + +### A Single Region + +Having built a generator tool, prepare a source file in pbf/o5m/bz2 format, and run: + + omim/tools/unix/generate_mwm.sh source.pbf + +In some minutes it will create a similarly-named `.mwm` file in the same directory as the original file. +Specify `TARGET` variable for changing that (e.g. `TARGET=.`). The script runs `generator_tool` twice, +see `find_generator_tool.sh` script for an algorithm on how it finds it. All temporary files are created +with `mktemp` and then removed. + +The resulting file won't have any coastlines, though MAPS.ME will overlay zoomed-in map with a low-quality +generalized coastline. To add a detailed coastline, you would need a `WorldCoasts.geom` file and +a [border polygon](http://wiki.openstreetmap.org/wiki/Osmosis/Polygon_Filter_File_Format) for a source +file area. Having that, run (and prepare to wait a bit longer): + + COASTS=WorldCoasts.geom BORDER=source.poly omim/tools/unix/generate_mwm.sh source.pbf + +A car routing index will be built when you specify a second parameter: either a full path to a Lua script +with a routing profile, or any gibberish, in which case a default `car.lua` from omim repository +would be used. For example: + + omim/tools/unix/generate_mwm.sh source.pbf asdf + +Inter-mwm navigation requires another index inside a `.mwm.routing` file. To build it, you would need +border polygons for not only the source region, but all regions neighbouring it. The source border polygon +must have the same name as the source file (e.g. `Armenia.poly` for `Armenia.pbf`), and in the target +directory shouldn't be a `borders` subdirectory. With all that, just use this line: + + BORDERS_PATH=/path/to/polygons omim/tools/unix/generate_mwm.sh source.pbf asd + +### The Planet -### Part of a planet +To create a bunch of MWM files for the entire planet, splitting it by border polygons, we have +a different script, `generate_planet.sh`. It will print a short help when run without arguments. +The usual line we use is: + + TARGET=/opt/mwm/151231 omim/tools/unix/generate_planet.sh -a + +This is a shortcut for following options: + +* `-u` - update a planet file from osm.org (use `-U` when you need to download one, specify `PLANET` +variable if it's not in `$HOME/planet/planet-latest.o5m`). +* `-l` - filter and process coastlines, creating `WorldCoasts.geom` and `.rawgeom` files. +* `-w` - generate overview maps, `World.mwm` and `WorldCoasts.mwm`. +* `-r` - generate routing indices, `.mwm.routing` file for each `.mwm`. + +All border polygons from `BORDERS_PATH` are processed into MWM files by default. You can +specify only required polygons in `REGIONS` variable, or set it to empty value, so no regular +MWM files are created. The whole process takes 15 hours on a 40-core server, so we suggest +you specify your e-mail address in a `MAIL` variable and get a mail when the generation +is finished. + +If a previous run ended with an error, the next one will ignore arguments and continue with +the same arguments as the previous time. Set `-c` option to ignore the stored status. + +Log files for each region and the entire process (`generate_planet.log`) are written to +`logs` subdirectory of the target. Intermediate data requires around 250 MB of space, and +to clean it during the process, specify `KEEP_INTDIR=` empty variable. + +#### Steps + +The planet generation process is divided in several steps, which are printed during the +script run, along with timestamps. To start generation from a specific step, specify it +in the `MODE` variable (and make sure you don't have stored status, or run with `-c` +option). + +* Step 1 (`coast`): updating planet file. +* Step 2: filtering and processing coast lines. If there was a merge error, the script +prints way identifiers, waits 40 minutes and tries again from step 1. +* Step R: preparing `.osrm` files for routing indices. PBF files for each region are +cut out of the planet, then OSRM backend scripts process each of these. Can work +asynchronously if `ASYNC_PBF=1` variable is set. +* Step 3 (`inter`): generating intermediate data for the planet. +* Step 4 (`features`): generating features for each region, splitting the planet. +* Step 5 (`mwm`): building the resulting MWMs. +* Step 6 (`routing`): building `.mwm.routing` files out of MWMs and `.osrm` files. +* Step 7 (`resources`): updating resource and map lists. +* Step 8 (`test`): calling `test_planet.sh` to run routing tests. + +### Variables + +*todo* ### Testing +To test that the generator is not broken, you don't have to wait for 20 hours processing +the whole planet: instead download [a 150 MB extract](http://osmz.ru/mwm/islands/) with +some islands and the corresponding script `islands.sh` and put these into `omim/tools/unix`. +Run the script with options for `generate_planet`, e.g. + + omim/tools/unix/islands.sh -lwr + +In a half an hour you'll get files for 4 regions in a `target` subdirectory. Note that +you can build both generator tool and OSRM backend with the `build_omim.sh` script. + ## Format + +*todo* |