[Talk-TW] Taiwan Highway Shields rendering

Fri 4月 12 07:24:39 UTC 2013

Thank for the instructions.
Louis' step 7 is new to me. XD

dongpo

On Fri, Apr 12, 2013 at 3:17 PM, Louis Liu <pttdog at gmail.com> wrote:
>
> Hi Arne,
>
> Wow!
>
> How do you handle  the ref tags of provincial/national highway branches,
> like 1甲 and 1乙?
> "甲" should bellow "1" in the shield, but Mapnik just puts them in the same
> line when using the default settings.
> I have an ugly solution: Every branches have their own in style sheet and
> STATIC shield images.
> There only tens of provincial branches in Taiwan, so this method is
> possible.
> But this makes the style sheet file more difficult to maintenance.
>
> I started to fix some ref tag near Taichung and Kaohsiung.
> There are so many tags need to be fix.
> So I use the offline edit function of JOSM to massive modification in the
> following steps:
> 1. Install waydownloader plug-ins.
> 2. Download a small area that covers highway from server.
> 3. Use waydownloader to download connected highways.
> 4. Repeat step 3 to complete all way segments
> 5. Save the data as file.
> 6. Use your favorite editor to replace the tags.
> 7. Don't forget to add "action='modify'" to the way you've modified.
> 8. Open JOSM and open the file, then upload.
> The step 7 is important. Otherwise, JOSM won't know the way is modified (
> and the changes won't be upload).
>
> But do you have any elegant solutions for these cases?
>
> Louis
>
> 2013/4/12 Arne Goetje <arne.goetje at gmail.com>
>>
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>> Dear all,
>>
>> I'm currently in the process of hacking the rendering of Taiwan's
>> highway shields into Mapnik, so that we can us it on our local
>> rendering server. I have uploaded[1] an example screenshot of my local
>> server's output as illustration how it may look like in future. (Don't
>> worry,I will make it more beautiful. This is just a proof of concept.)
>>
>> However, in order for this to work properly, I need everyone's help to
>> fix the 'ref' tags in the database.
>>
>> 1. How the 'ref' tags are used:
>>         a. 'ref:en' and 'ref:zh'
>>         These tags are *never* rendered on the map! The /may/ be used by
>> routing software to *announce* the turning directions to the driver.
>> E.g. if 'ref:en'='Provincial Highway 4', the GPS routing software
>> /may/ use this value to give directions, as in: "Turn right and follow
>> $ref:en in 200 meters!"
>>
>>         b. 'ref'
>>         This tag is rendered on the map *as is*. Mapnik and other
>> applications *do not parse* the value and probably never will.
>> Therefore we need to make sure that this value has a usable format.
>> Some time ago we agreed already, that the old practice from putting
>> 'Fwy','Hwy' and English county abbreviations in this field (because
>> the rendering software did not have Chinese support available at that
>> time) should be changed.
>> Now, for the highway shields to work we *must* update all 'ref' tags
>> to the new tagging rules:
>>         * Freeways, Expressways and Highways: delete the 'Fwy' or 'Hwy'.
>>           E.g. 'Fwy 1' should become '1'.
>>         * Tertiary highways should have the Chinese county indicator and
>> not
>> the English abbreviation.
>>           E.g. 'TY48' should become '桃48'. Do not put spaces, dashes or
>> other characters in it (e.g. 縣).
>>
>>         c. 'ref' where multiple highways merge
>>         According to the OSM wiki, we should separate tag values with ';',
>> like '1;4;110', where the three highways 1,4 and 110 share the same
>> road. However, the ';' separator will not be parsed by the rendering
>> engine, that means, the value '1;4;110' will appear exactly like this
>> on the map. This *does not* work with the highway shields.
>> Since we cannot parse this value in Mapnik, we need to put additional
>> information into the database.
>>
>> I propose the following new tags:
>>         1. add a 'merged_highways' tag with a value of 1, 2, 3, or how
>> many
>> highways are merged on this way.
>>         2. add tags for each 'ref', like 'ref1', 'ref2', 'ref3', etc. with
>> the correct values.
>>
>> Example:
>>         'highway'='primary'
>>         'name'='三民路二段 (Sec. 2, Sanmin Rd.)'
>>         'ref'='1;4;110'
>>         'ref:en'='Provincial Highways 1, 4 & Route 110'
>>         'ref:zh'='台1、4線、110' (or whatever better way to describe it)
>>         'merged_highways'='3'
>>         'ref1'='1'
>>         'ref2'='4'
>>         'ref3'='110'
>> (Note: additional tags have been omitted in this example)
>>
>> This way, the default OSM map will behave like usual, but our map can
>> properly render 3 highway shields next to each other. (The fact that
>> '110' is a county highway and not a provincial highway can be
>> determined by regular expressions in Mapnik.)
>>
>> So, please everyone help to clean up the 'ref' tags in the main OSM
>> database:
>>         * remove 'Fwy', 'Hwy' and all white spaces
>>         * replace the English county indicators on Tertiary highways with
>> their proper Chinese ones, remove spaces and dashes where not appropriate
>>         * Where merged highways exist, update them according to the
>> example
>> above, remove spaces, ensure the separator in 'ref' is a ';'.
>>
>> Happy mapping! :)
>>
>> Cheers and Thanks!
>> Arne
>>
>> [1] http://people.linux.org.tw/~arne/OSM_Highway_Shields.png
>>
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