[mkgmap-dev] How to display highway shields with numbers only

Tue Dec 9 02:51:59 GMT 2014

Hi list members,

I'm relatively new to mkgmap.  I have a question about displaying shields on
highways.  Table 4.4 in the Conversion Style Manual shows highway shields
displaying numbers only, which is what I would like to achieve.  In Table
4.3 (the list of substitution filters), the description for the
highway-symbol filter says that the filer "Prepares the value as a highway
reference such as 'A21' 'I-80' and so on.  A code is added to the front of
the string so that a highway shield is displayed, spaces are removed and the
text is truncated so as not to overflow the symbol."  The description does
not explain (from what I can tell) how to remove the alphabetic characters,
leaving only the numbers.  I've tried several possibilities of the filter
without success.  Where I live, there's a motorway called Interstate 70
which is labeled "I70" in OSM.  I would like to create shields with only the
number in the shields, similar to the example in Table 4.4.  How do I do
this?

Mark

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