[mkgmap-dev] [PATCH] patch (V8) for simplifying ways and reducing img size

Fri Nov 27 00:20:35 GMT 2009

I wanted to apply it but I get "The chunk size did not match the number 
of added/removed lines!"

Is there possibly something wrong with Patch V8?

Johann Gail wrote:
> Patch V8 updated to r1404.
> - do not merge lines at resolution 24, as the dp filter is disabled. 
> With this change there should be no longer routing problems.
>
> -------------------------------------------------------------------
>
> Patch V7 is now based on the R1041 (and the SizeFilter.patch)
> - removing of the -- suppress-dead-end-nodes option, as it causes 
> problems with routing.
> - code cleanup, introduction of new classes.
>
> -------------------------------------------------------------------
>
> Patch V4 now supports three options.
> Its build on top of r972. With all three options used, it will reduce 
> the four bavaria tiles from 58MB to 46MB. Drawing at low zoom levels 
> gets speed up significantly at my etrex.
>
> This will not be the last version of the patch. I'm working further on 
> it, but have no idea, how fast work will progress.
>
> The options are as follows:
>
> +--reduce-point-density=num
> +    Simplifies the ways with the douglas peucker algorithm.
> +    num is the maximal allowed error distance, by which the resulting
> +    way may differ from the original one.
> +    This distance gets shifted with lower zoom levels.
> +    Recommended setting is 10, this should lead to only small 
> differences
> +    (Default is 2.6, which should lead to invisible changes)
> +
> +-- suppress-dead-end-nodes
> +    Do not generate nodes at the end of an dead end way.
> +    Decrease file size and should speed up routing slightly.
> +    May possibly cause errors, but not seen any one at the moment.
> +
> +--merge-lines
> +    Try to merge lines. This helps the simplify filter to straighten out
> +    longer chunks at lower zoom levels. Decreases file size more.
> +    Increases paint speed at low zoom levels
> .
> ------------------------------------------------------------------------
>
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