Author Topic: Higher resolution elevation data  (Read 1972 times)

Offline chbla

  • More than Newbie
  • *
  • Posts: 85
    • View Profile
Higher resolution elevation data
« on: March 22, 2016, 20:32:07 »
Hi there,

I've got a question, there is quite high-resolution elevation data available for Austria, and I managed to get it loaded in GlobalMapper (see screenshot for a difference between existing hgt files I have vs the high-resolution ones).

As I have no experience with GIS whatsoever I wanted to ask:

1. Are there benefits to using these in Locus, or does it have its own limitation regarding resolution? (e.g. for the slope shading)
2. Can anyone tell me how this should be exported to be usable? I can apparently export it in SRTM 1" and 3" .hgt files which makes me wonder if this reduces that resolution or if it keeps it?

Maybe someone familiar with all this GIS magic can help me.

Thanks a lot,
Christoph
« Last Edit: March 22, 2016, 20:46:04 by chbla »
 

Offline gynta

  • Global Moderator
  • Professor of Locus
  • *****
  • Posts: 3503
  • Thanked: 23 times
    • View Profile
    • Locus live tracking service
  • Device: SGS5m (4.4.2 root), SGTab10.1 (4.0.4)
Re: Higher resolution elevation data
« Reply #1 on: March 22, 2016, 22:46:26 »
3"
http://www.viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org3.htm

1"
http://www.viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org1.htm
select area of map shading and download it
extract and copy the altitude *:hgt files to Locus/data/srtm directory

make it sense?

3": 1,75MB
1": 24,7MB - whole Alps 2,5 GB (roughly)

Compare...

...slope: http://www.oldboys.at/comp1/
plausible view?

...hillshading: http://www.oldboys.at/comp2/
« Last Edit: March 22, 2016, 22:48:35 by gynta »
 

Offline chbla

  • More than Newbie
  • *
  • Posts: 85
    • View Profile
Re: Higher resolution elevation data
« Reply #2 on: March 22, 2016, 22:51:56 »
Thanks a lot for your answer - but I think you misunderstood. Why download?
The files I want to use are of higher resolution.
 

Offline gynta

  • Global Moderator
  • Professor of Locus
  • *****
  • Posts: 3503
  • Thanked: 23 times
    • View Profile
    • Locus live tracking service
  • Device: SGS5m (4.4.2 root), SGTab10.1 (4.0.4)
Re: Higher resolution elevation data
« Reply #3 on: March 22, 2016, 22:55:18 »
just do it

Offline chbla

  • More than Newbie
  • *
  • Posts: 85
    • View Profile
Re: Higher resolution elevation data
« Reply #4 on: March 22, 2016, 22:56:25 »
Do what? Did you even read my question?
 

Offline gynta

  • Global Moderator
  • Professor of Locus
  • *****
  • Posts: 3503
  • Thanked: 23 times
    • View Profile
    • Locus live tracking service
  • Device: SGS5m (4.4.2 root), SGTab10.1 (4.0.4)
Re: Higher resolution elevation data
« Reply #5 on: March 22, 2016, 23:07:17 »
there is quite high-resolution elevation data available for Austria
http://www.viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org1.htm
or other source?

Quote
Are there benefits to using these in Locus?
try it

Quote
I can apparently export it in SRTM 1" and 3" .hgt files
great ! - so, just use it.

Offline chbla

  • More than Newbie
  • *
  • Posts: 85
    • View Profile
Re: Higher resolution elevation data
« Reply #6 on: March 22, 2016, 23:09:11 »
it's a different source, a 10m grid (just see my attached image in the first post - it's a comparison between my sources and the ones you posted)

my question is:
2. I can apparently export it in SRTM 1" and 3" .hgt files which makes me wonder if this reduces that resolution or if it keeps it?

Could you give me a link to the area you posted?
I'd like to compare it but cannot find a name on it
« Last Edit: March 23, 2016, 00:01:32 by gynta »
 

Offline gynta

  • Global Moderator
  • Professor of Locus
  • *****
  • Posts: 3503
  • Thanked: 23 times
    • View Profile
    • Locus live tracking service
  • Device: SGS5m (4.4.2 root), SGTab10.1 (4.0.4)
Re: Higher resolution elevation data
« Reply #7 on: March 22, 2016, 23:17:01 »
i fear your export ends in the same result.
link to this area? uff  - have to search...
brb

Offline chbla

  • More than Newbie
  • *
  • Posts: 85
    • View Profile
Re: Higher resolution elevation data
« Reply #8 on: March 22, 2016, 23:19:10 »
yes that's what I wan to find out, how to export and use the higher resolution files..
 

Offline gynta

  • Global Moderator
  • Professor of Locus
  • *****
  • Posts: 3503
  • Thanked: 23 times
    • View Profile
    • Locus live tracking service
  • Device: SGS5m (4.4.2 root), SGTab10.1 (4.0.4)
Re: Higher resolution elevation data
« Reply #9 on: March 22, 2016, 23:24:19 »



Offline chbla

  • More than Newbie
  • *
  • Posts: 85
    • View Profile
Re: Higher resolution elevation data
« Reply #10 on: March 22, 2016, 23:29:01 »
Ah I did not generate the data for this point yet - if you have elevation data for all parts of Austria, could you maybe take a screenshot of 47.3573592,9.7254071 with the zoom/scale set to 400m and slope shading on? I'd like to compare it as I have two different files
 

Offline gynta

  • Global Moderator
  • Professor of Locus
  • *****
  • Posts: 3503
  • Thanked: 23 times
    • View Profile
    • Locus live tracking service
  • Device: SGS5m (4.4.2 root), SGTab10.1 (4.0.4)
Re: Higher resolution elevation data
« Reply #11 on: March 22, 2016, 23:30:49 »
sure...
1" and 3" ?

Offline chbla

  • More than Newbie
  • *
  • Posts: 85
    • View Profile
Re: Higher resolution elevation data
« Reply #12 on: March 22, 2016, 23:31:11 »
if possible yes, but 1" would be enough I think
 

Offline gynta

  • Global Moderator
  • Professor of Locus
  • *****
  • Posts: 3503
  • Thanked: 23 times
    • View Profile
    • Locus live tracking service
  • Device: SGS5m (4.4.2 root), SGTab10.1 (4.0.4)
Re: Higher resolution elevation data
« Reply #13 on: March 22, 2016, 23:46:02 »


. 1"

. 1"

...blurry because it was 143% of zoom16
« Last Edit: March 22, 2016, 23:57:55 by gynta »
 

Offline chbla

  • More than Newbie
  • *
  • Posts: 85
    • View Profile
Re: Higher resolution elevation data
« Reply #14 on: March 23, 2016, 00:05:33 »
Looks really different ..
which map/style did you use exactly so I can compare better?