[mkgmap-dev] Combine ovm files?

Wed Feb 18 04:06:19 GMT 2015

Hi Ralf,

it is okay when the size of the overview map is much smaller
than the sum of the ovm* sizes. This is expected.
I think the reason is that the ovm* files contain many
labels which don't appear in the final overview map.

Gerd

Ralf Kleineisel wrote
> Hi,
> 
> On 02/17/2015 10:48 PM, GerdP wrote:
> 
>> this should work:
>> copy all *.img and ovm*.img into one directory and
>> use
>> java -jar mkgmap.jar *.img 
>> maybe with additional options for codepage etc.
> 
> that's what I thought, too, but it doesn't:
> 
> Starting with 3 tiles + 3 overview tiles:
> 
> $ ls -l
> total 52152
> -rw-r--r-- 1 ralf users 13522944 Feb 17 22:55 10000001.img
> -rw-r--r-- 1 ralf users 16841216 Feb 17 22:55 10000002.img
> -rw-r--r-- 1 ralf users 19913728 Feb 17 22:55 10000003.img
> -rw-r--r-- 1 ralf users   768512 Feb 17 22:55 ovm_10000001.img
> -rw-r--r-- 1 ralf users  1009152 Feb 17 22:55 ovm_10000002.img
> -rw-r--r-- 1 ralf users  1336320 Feb 17 22:55 ovm_10000003.img
> 
> $ java -enableassertions -Xmx8192m -jar mkgmap.jar --overview-mapname=ov
> --overview-mapnumber=99999999 *img
> 
> produces this:
> 
> -rw-r--r-- 1 ralf users    24064 Feb 17 22:56 ov.img
> 
> which is obviously much smaller than the three ovm files.
> 
> If I make a gmapsupp it's the same problem:
> 
> $ java -enableassertions -Xmx8192m -jar mkgmap.jar --overview-mapname=ov
> --overview-mapnumber=99999999 --gmapsupp *img
> 
> $ gmt -i gmapsupp.img
> gmt v0.8.186.801b  CC BY-SA (C) 2011-2014 AP www.gmaptool.eu
> 
> File:           gmapsupp.img, length 50199552
> Header:         17.02.2015 23:00:09, DSKIMG, XOR 00, V 0.00, Ms 0
> Mapset:         OSM street map
> 
> Map              length s-f  CP    prio  PID   FID  name
>  MAKEGMAP MPS       258  1
>  10000001 MPC  13462832  5  1252   25      1  6324  Description
>  10000002 MPC  16766155  5  1252   25      1  6324  Description
>  10000003 MPC  19826659  5  1252   25      1  6324  Description
>  99999999 MPC     20371  3  1252   25      1  6324  Overview Map
>  00006324 SRT       932  1
> 
> Data MPS
>  F: PID 1, FID 6324, family name
>  V: OSM map set (0)
> 
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