Thanks for the info!! El 28/01/18 a las 14:20, Peter Danninger escribió:
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
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.