El 02/02/17 a las 14:06, Andrzej Popowski escribió:
Hi Carols,
some guessing on my part, hope someone corrects if I'm wrong.
As I understand, elevations in img are stored in feet.
Filters hight:m=>ft and conv:m=>ft indicate, that value from source
has to be converted into feet, as expected by img format.
When you look at map, you see height units according to settings in
GPS. You can set meters or feet. So for hight:m=>ft, these values are
correct:
ele=500, map: ", 500 m" = 1650ft, default conversion
ele=500m, map: ", 500 m" = 1650ft, converted form meters
ele=500ft, map: ", 152 m" = 499ft, preserved feet
Settings in GPS are valid only for some objects types and label
content. Conversion in GPS is done, when label starts with numeric or
numeric is prefixed by special separator (it is [0x1f] for
cgpsmapper). I guess filter "hight:" adds separator and GPS converts
it to ", ".
Now filter hight:ft=>m seems to be kind of useless. It converts feet
to meters, stores this value in img and adds a prefix, indicating that
value is in feet. What we need here, is no conversion but separator
only. Maybe something like this could work: {ele|height:ft=>ft}.
Actually it always should be feet as a destination for height, we
could simplify this filter like this: {ele|height:m} or
{ele|height:ft}, indicating only default unit in source data.
It also looks reasonable to me.
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