Hi Ticker,
I guess variables like mkgmap:us_interstate come from my style. I use
them for shields with road reference numbers. There are dedicated
shields for US maps and standard shields for other countries. These
variables allows to create single style for both cases.
This is an example from my style, file "lines":
# Set highway names to include the reference if there is one
highway=motorway & mkgmap:us_interstate=* {name
'${mkgmap:us_interstate|highway-symbol:interstate:12}'; addlabel
'${name|not-equal:ref}'; set mkgmap:refnam=yes}
highway=motorway & mkgmap:refnam!=* & mkgmap:us_usroute=* {name
'${mkgmap:us_usroute|highway-symbol:shield:12}'; addlabel
'${name|not-equal:ref}'; set mkgmap:refnam=yes}
highway=motorway & mkgmap:refnam!=* & mkgmap:us_state=* {name
'${mkgmap:us_state|highway-symbol:round:12}'; addlabel
'${name|not-equal:ref}'; set mkgmap:refnam=yes}
highway=motorway & mkgmap:refnam!=* & mkgmap:admin_level2=USA {name
'${name}' | '${ref}'; set mkgmap:refnam=yes} #disable box
highway=motorway & mkgmap:refnam!=* & mkgmap:admin_level2!=USA {name
'${ref|highway-symbol:hbox:12}'; addlabel '${name|not-equal:ref}'; set
mkgmap:refnam=yes}
highway=trunk & mkgmap:refnam!=* & mkgmap:admin_level2!=USA {name
'${ref|highway-symbol:hbox:12}'; addlabel '${name|not-equal:ref}'; set
mkgmap:refnam=yes}
highway=* & mkgmap:refnam!=* & mkgmap:us_interstate=* {name
'${mkgmap:us_interstate|highway-symbol:interstate:12}'; addlabel
'${name|not-equal:ref}'; set mkgmap:refnam=yes}
highway=* & mkgmap:refnam!=* & mkgmap:us_usroute=* {name
'${mkgmap:us_usroute|highway-symbol:shield:12}'; addlabel
'${name|not-equal:ref}'; set mkgmap:refnam=yes}
highway=* & mkgmap:refnam!=* & mkgmap:us_state=* {name
'${mkgmap:us_state|highway-symbol:round:12}'; addlabel
'${name|not-equal:ref}'; set mkgmap:refnam=yes}
highway=* & mkgmap:refnam!=* & mkgmap:admin_level2=USA {name '${name}'
| '${ref}'; set mkgmap:refnam=yes} #disable box
highway=primary & mkgmap:refnam!=* & (name=* | ref=*) {name
'${name|not-equal:ref}' | '${ref|highway-symbol:box:12}'; set
mkgmap:refnam=yes}
highway=secondary & mkgmap:refnam!=* & (name=* | ref=*) {name
'${name|not-equal:ref}' | '${ref|highway-symbol:oval:12}'; set
mkgmap:refnam=yes}
highway=* & mkgmap:refnam!=* {name '${name}'
| '${ref}'}
--
Best regards,
Andrzej
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