[mkgmap-dev] Is dem-tdb branch ready for trunk ?

Sun Jan 28 13:20:42 GMT 2018

I've downloaded and testet.

look at attachment.

In short-form:
-----------------------------------------
really good, comparable with the
USGS-NASA .hgt-files.

  N74E018, N74E019:
    Bjornoya (Bäreninsel) missing,
    only "0", files deactivated

  N52E006, N51E005, N51E008, N50E005:
    some void's, easily correctable

comparisation with USGS-NASA files
only in the Alps-area and
only regarding min/max-values:

majority are nearly identical,
some differ by 20-30m
regarding the min/max-values,
but which are "better" ???

regards Peter

Am 27.01.2018 um 17:50 schrieb Carlos Dávila:
> Thanks for sharing your results. Have you tested data from 
> http://opendem.info/opendemeu_download_4326.html ?
> 
> El 27/01/18 a las 15:56, Peter Danninger escribió:
>> Some results from my .hgt-tests:
>>
>> I wanted to find usable .hgt files for my
>> web-application zu add height data to .gpx
>>
>> http://peter.myds.me/HDS/Tipps_Tricks/GPS/GPXclean/GPXclean.html
>>  ==> look at: "Spezialisten-Funktionen per Aufrufparameter"
>>  ==> sorry, only German ...
>>
>>  ==> The results are in the attachment.
>>
>> In short form:
>> -----------------------------------------------------
>> Viewfinderpanoramas Medium Europe 3sec:
>>   ==> lots of voids and too low height values.
>>
>> NASA_USGS 1sec:
>>   ==> no voids, but some too low height values.
>>   not too bad, but easily correctable by
>>   directly adjacent height values.
>>   BUT only up to N59 in the north.
>>
>> Viewfinderpanoramas Northern Europe 1/3 sec:
>>   ==> some voids in Island in the overlay
>>   row/col, but easily correctable by
>>   directly adjacent height values.
>>
>> To sum up:
>> More then 3100 .hgt files without real problems.
>> As far as available these are 1sec files.
>> Only in the very north 3sec .hgt files.
>>
>> I'm happy with the NASA_USGS 1sec .hgt files :-)
>>
>> Peter
>>
>> http://www.danninger.eu
>>
>> Am 27.01.2018 um 15:06 schrieb Carlos Dávila:
>>> El 27/01/18 a las 14:57, Carlos Dávila escribió:
>>>> I have no objective method to compare hgt sources (is there any?)
>>>
>>> Well, a method I have already used is to get the number of voids in a 
>>> hgt file using QGIS.
>>>
>>>
> 
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