[mkgmap-dev] Drive-on-left

Tue Aug 6 21:01:33 BST 2013

Hi Steve, thanks for the patch... any chance of a jar file please? Then
I can check it out. Will this find its way into the standard code? 

As I mentioned I am not a java programmer although I can read and
understand it well enough. 

Thanks again, 

Colin 

On 2013-08-06 16:21, Steve Ratcliffe wrote: 

> On 05/08/13 19:30, Colin Smale wrote:
> 
>> I took a look at the code and saw that the drive-on-left and drive-on-right flags are only used to set a flag in NODHeader.java. However I just discovered ImgTool[1] which exposes the "TRE parameters", a sequence of four numbers which, I noticed, include a flag for "drive-on-left". This was not being set on my UK maps (despite using the drive-on-left option for mkgmap) so they all appeared to be drive-on-right. With ImgTool I was able to simply set this bit in my img file - and then the problems with the roundabout direction disappeared!
> 
> Very interesting.
> 
> I've created a patch based on your discovery which is attached.
> 
> It only works when there is an explicit --drive-on-left flag and not
> when mkgmap infers it by looking at the direction of roundabouts.
> How important do you think that is? I think it is much safer to
> give the flag than letting mkgmap guess which can be wrong for all
> kinds of reasons.
> 
> Cheers,
> 
> ..Steve
> 
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