Author Topic: Higher resolution elevation data  (Read 2757 times)

Offline gynta

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Re: Higher resolution elevation data
« Reply #15 on: March 23, 2016, 00:07:29 »
last LoMap of austria from store
and http://forum.locusmap.eu/index.php?topic=4982.msg41086#msg41086  HiLo theme
« Last Edit: March 23, 2016, 00:12:30 by gynta »
 

Offline chbla

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Re: Higher resolution elevation data
« Reply #16 on: March 23, 2016, 00:11:44 »
Ah, I don't have that one.
However, I've attached a screenshot with hike&bike osm classic

 
« Last Edit: March 23, 2016, 00:46:46 by gynta »
 

Offline chbla

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Re: Higher resolution elevation data
« Reply #17 on: March 23, 2016, 00:17:03 »
Here is a better comparison, in GlobalMapper you can actually see the difference in detail:

SRTM 1" from Viewfinder (the one that you have)
https://dl.dropboxusercontent.com/u/311345/gps/viewfinder_srtm1.png

SRTM 1" my Version, better resolution
https://dl.dropboxusercontent.com/u/311345/gps/my_srtm1.png
« Last Edit: March 23, 2016, 00:51:06 by chbla »
 

Offline gynta

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Re: Higher resolution elevation data
« Reply #18 on: March 23, 2016, 00:51:44 »
Nice and clear in GlobalMapper but what's nearly realistic inside Locus?

Offline chbla

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Re: Higher resolution elevation data
« Reply #19 on: March 23, 2016, 00:54:21 »
Yes, the files I have are much better than the SRTM1 ones.
But check this one, this is the original:
https://dl.dropboxusercontent.com/u/311345/gps/high_detail.png
That's why my initial question was how to export it for maximum resolution.

Best to compare all 3:
SRTM1 https://dl.dropboxusercontent.com/u/311345/gps/viewfinder_srtm1.png
SRTM1my https://dl.dropboxusercontent.com/u/311345/gps/my_srtm1.png
Orig https://dl.dropboxusercontent.com/u/311345/gps/high_detail.png

As you say I don't know where the limits of locus are, that's why I'm asking - but I assume better quality does not harm.
 

Offline poutnikl

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Re: Higher resolution elevation data
« Reply #20 on: March 23, 2016, 06:58:09 »
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?

That is strange, as 1" and 3" are 30 and 90m grid, respectively.  ( 1' is 1 nautical mile 1852 m, 1800/60  = 30 )

The known problem with SRTM artefacts remain ( woods, narrow valleys, urban canyons, rivers, bridges)
 as reportedly tested by Brouter author, they have just better details.
https://github.com/poutnikl/Brouter-profiles/wiki
When a user digs profiles up from the GitHub repositories,
they will be hopefully wrapped in some wiki knowledge....  :-)
 

Offline chbla

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Re: Higher resolution elevation data
« Reply #21 on: March 23, 2016, 08:17:47 »
@poutnikl, see the files above, I'm just comparing SRTM 1" with my data that I exported as "SRTM 1" in global mapper as this exports to .hgt.

The underlying data is not 30/90 resolution but 10m (I also have 5m).
 

Offline poutnikl

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Re: Higher resolution elevation data
« Reply #22 on: March 23, 2016, 09:42:03 »
I see. It is known that not all elevation data are SRTM based, therefore thanks for explanation.
https://github.com/poutnikl/Brouter-profiles/wiki
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Offline chbla

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Re: Higher resolution elevation data
« Reply #23 on: March 23, 2016, 13:39:20 »
What digital elevation data files/formats can locus handle exactly?
 

Offline chbla

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Re: Higher resolution elevation data
« Reply #24 on: March 24, 2016, 18:57:34 »
I noticed that the SRTM .hgt format itself limits a higher resolution :/