[mkgmap-dev] overview map

Fri May 31 07:07:38 BST 2013

Hi all,

finally I've merged r2629 into trunk.

A brief description of the changes:
1) new or changed options
--overview-levels
  like levels, specifies additional levels that are to be written to the
  overview map. Counting of the levels should continue. Up to 8 additional 
  levels may be specified, but the lowest usable resolution with MapSource 
  seems to be 11.     

--remove-ovm-work-files
  If overview-levels is used, mkgmap creates one additional file 
  with the prefix ovm_ for each map (*.img) file. 
  These files are used to create the overview map.
  With option --remove-ovm-work-files=true the files are removed 
  after the overview map was created. The default is to keep the files.  

--polygon-size-limits=limits code
  Allows to specify different min-size-polygon values for each resolution.
  Sample:  
  --polygon-size-limits="24:12, 18:10, 16:8, 14:4, 12:2, 11:0"
  If a resolution is not given, mkgmap uses the value for the next higher 
  one. For the given sample, resolutions 19 to 24 will use value 12,
  resolution 17 and 18 will use 10, and so on.
  Value 0 means to skip the size filter. 
  Note that in resolution 24 the filter is not used.  

2) Optimizations:
- The polygon filter allows larger polygons. 
- SeaGenerator generates fewer "sea-only" and "land-only" polygons when 
  precomp-sea is used.
Both reduce the img size, esp. for maps containing large "sea only" areas. 

3) Changes regarding styles:
- The support for the out-aged map-features.csv file was removed
- Level ranges can now use min-max or max-min
- Usage of polygon type 0x4a will be flagged with --check-styles

4) Other changes
- A few checks are performed regarding the plausibility of the given options
and input files
to help beginners.

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