This object is in archive!
HGT update
Answered
Is it possible to update HGT files with Locus? Are they updated at all? Or are there different sources for some countries with better resolution, and newer?
I was glacier trekking last week in Switzerland, and sometimes the actual altitude was more than 100m (!) below what Locus was showing me.
I realize that for probably 99.9% of the earth's surface, the altitude profile doesn't change significantly over the years - but glaciers are an exception, and unfortunately these days a big one.
Anyone knows anything about this?
The same question
Hi,
we use several free sources for elevation HGT data. For Austria, Slovenia and part of Germany we use elevation data from Local Lidar missions but the main part of data is from Viewfinderpanoramas project. ViewFinderPanorames used also several datasources to obtain the most precise digital elevation model. It seems that majority of data it's from years 2000 or 2009. I'm sorry but we can't provide newest data.
I know that global warming is here but I wouldn't expect such changes. Please check your settings Menu > Settings > GPS and location > Altitude correction > enable "Altitude offset" and "Automatic correction" on Offset tab. This settings correct elevation from GPS to "real" values. Please see http://docs.locusmap.eu/doku.php?id=manual:user_guide:tools:altitude#altitude_offset
Thank you
Best regards
Petr
Hi,
we use several free sources for elevation HGT data. For Austria, Slovenia and part of Germany we use elevation data from Local Lidar missions but the main part of data is from Viewfinderpanoramas project. ViewFinderPanorames used also several datasources to obtain the most precise digital elevation model. It seems that majority of data it's from years 2000 or 2009. I'm sorry but we can't provide newest data.
I know that global warming is here but I wouldn't expect such changes. Please check your settings Menu > Settings > GPS and location > Altitude correction > enable "Altitude offset" and "Automatic correction" on Offset tab. This settings correct elevation from GPS to "real" values. Please see http://docs.locusmap.eu/doku.php?id=manual:user_guide:tools:altitude#altitude_offset
Thank you
Best regards
Petr
Hi guys,
Peter, I should be careful with "wouldn't expect". For example here is clearly "First results from field measurements indicate that the extreme warm and dry weather conditions in summer 2003 caused an average loss in thickness of glaciers in the European Alps of about 3 meters water equivalent, nearly twice as much as during the previous record year of 1998 (1.6 m), and roughly five times more than the average loss of 0.65 m per year recorded during the exceptionally warm period 1980 - 2000. In 2003 alone, the total glacier volume loss in the Alps corresponds to 5-10% of the remaining ice volume (18).".
So since year 2000, total change of glacier height may be even close to 50 metres. Just for your info ...
Hi guys,
Peter, I should be careful with "wouldn't expect". For example here is clearly "First results from field measurements indicate that the extreme warm and dry weather conditions in summer 2003 caused an average loss in thickness of glaciers in the European Alps of about 3 meters water equivalent, nearly twice as much as during the previous record year of 1998 (1.6 m), and roughly five times more than the average loss of 0.65 m per year recorded during the exceptionally warm period 1980 - 2000. In 2003 alone, the total glacier volume loss in the Alps corresponds to 5-10% of the remaining ice volume (18).".
So since year 2000, total change of glacier height may be even close to 50 metres. Just for your info ...
Thx for the explanation. I'm in Switzerland btw - what data do you use there?
However, it's not a matter of settings - we crosschecked the data with several separate altitude meters on several days, always calibrating it at the last fixed point. So yes, sad but true, but some glaciers can lose more than 100m of height within a decade or two (if you're interested: It's the Gornerglacier in Zermatt). The finding is also confirmed by our mountain guide that has been doing this route for more than 20 years...
Anyway, I just thought because I have the HGT files cached on my phone: Does Locus ever checked for updates at all (if there are any)? I could probably force an update by deleting the file, sure, but that's tedious...
Thx for the explanation. I'm in Switzerland btw - what data do you use there?
However, it's not a matter of settings - we crosschecked the data with several separate altitude meters on several days, always calibrating it at the last fixed point. So yes, sad but true, but some glaciers can lose more than 100m of height within a decade or two (if you're interested: It's the Gornerglacier in Zermatt). The finding is also confirmed by our mountain guide that has been doing this route for more than 20 years...
Anyway, I just thought because I have the HGT files cached on my phone: Does Locus ever checked for updates at all (if there are any)? I could probably force an update by deleting the file, sure, but that's tedious...
Replies have been locked on this page!