[mkgmap-dev] Is height: filter working as described?

Thu Feb 2 10:44:42 GMT 2017

I thought the special character was the comma that is added after the 
name. So there is some internal character that may affect displayed 
units, right?

El 02/02/17 a las 11:31, Gerd Petermann escribió:
> Hi Carlos,
>
> I forgot to mention that the special separation character added by the height filter might tell Garmin softtware
> to convert the value (again). IIRC there is a flag in the img file which tells Garmin if values are in feet or metres, so
> you are probably right that the filter doesn't work as expected.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <GPetermann_muenchen at hotmail.com>
> Gesendet: Donnerstag, 2. Februar 2017 11:18:05
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Is height: filter working as described?
>
> Hi Carlos,
>
> this seems to be a problem in the documentation. I found this description for the height filter:
> "This is exactly the same as the conv filter, except that it prepends a special separation character before the value
> which is intended for elevations."
> ${ele|height:"m=>ft"}
>
>
> This can be easily confused with the example for the conv filter:
> ${height|conv:"m=>ft"}
>
> Looking at the source code the description for height seems okay.
> In your examples the rule doesn't place the argument in "", maybe that is the problem?
>
> Gerd
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Carlos Dávila <cdavilam at orangecorreo.es>
> Gesendet: Donnerstag, 2. Februar 2017 10:45:02
> An: Development list for mkgmap
> Betreff: [mkgmap-dev] Is height: filter working as described?
>
> According to style manual the rule
> natural=peak {name '${name|def:}${ele|height:m=>ft|def:}' } [0x6616
> resolution 24]
> from default style should convert ele values from meters to feet,
> assuming ele is in meters, but this is what map shows for the following
> ele values:
> ele=500, map: ", 500 m"
> ele=500m, map: ", 500 m"
> ele=500ft, map: ", 152 m"
> So it seems to be doing right the opposite, converting from feet to
> meters. Also, with m=>ft rule, map should show ft units, not m.
> If I invert the rule from m=>ft to ft=>m this is what happens:
> ele=500, map: ", 46 m"
> ele=500m, map: ", 152 m"
> ele=500ft, map: ", 46 m"
> Now it seems when values are in feet conversion factor is applied twice.
> It seems when height: is used it always does a ft to m conversion first
> and then it applies what is specified in the rule.
> For the same examples, conv: filter gives the right values.