Hi
The idea of a dem.zip sounds would have some major disadvantages
1) Data can only be 3arc or 1 arc not both
2) 1 arc data to me is more preferable but contains void data which have
to be replaced with 3arc data
Nick
On 27/01/2018 09:40, Thomas Morgenstern wrote:
Maybee we can create a ready to use DEM-model, store it like the
bounds.zip and see.zip ? The user can download it and mkgmap reads the
DEM from downloaded #DEM.ZIP# ?
This method would be a graet advantage for users, who not so familiar
with the DEM .
Regards Thomas
--------------------------------------------------
Von: "Gerd Petermann" <gpetermann_muenc...@hotmail.com>
Datum: Samstag, 27. Januar 2018 08:54
An: <mkgmap-dev@lists.mkgmap.org.uk>
Betreff: [mkgmap-dev] Is dem-tdb branch ready for trunk ?
Hi all,
I am not aware of any erros in r4091, so I think it is time to merge
it into trunk.
I see only one problem: HGT data changes rarely, so I'd prefer to do
the costly DEM calculations
only once and be able to store the results.
I've already described how to do this here [1] but I'd prefer to have
a container format that allows
mkgmap to extract the Garmin DEM bitstream data for a given lat/lon
pair from a file.
Such a container could contain the DEM data for one or more dem-dist
values. It could be empty first
and grow each time you calculate DEM for a new area. In subsequent
executions of mkgmap it would
check if the container already contains the data for the wanted area.
Advantage would be a faster tile compilation and less power
consumption, disadvantage would be the
additional disk space and higher complexity.
[1]
http://gis.19327.n8.nabble.com/Performance-with-zipped-hgt-files-tp5909756p5909801.html
Gerd
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