Higher resolution elevation data

Started by chbla, March 22, 2016, 20:32:07

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gynta

#15
last LoMap of austria from store
and http://forum.locusmap.eu/index.php?topic=4982.msg41086#msg41086  HiLo theme

chbla

#16
Ah, I don't have that one.
However, I've attached a screenshot with hike&bike osm classic

 
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chbla

#17
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
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gynta

Nice and clear in GlobalMapper but what's nearly realistic inside Locus?

chbla

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.
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poutnikl

Quote from: chbla 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?

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.

chbla

@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).
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poutnikl

I see. It is known that not all elevation data are SRTM based, therefore thanks for explanation.

chbla

What digital elevation data files/formats can locus handle exactly?
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chbla

I noticed that the SRTM .hgt format itself limits a higher resolution :/
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