Author Topic: SRTM- no attitude in some points  (Read 3743 times)

Offline menion

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Re: SRTM- no attitude in some points
« Reply #15 on: March 15, 2013, 12:30:19 »
generally there are no most accurate. every has good places and bad places. But everything is better then nothing. There is also no comparation so I'm saying this only from own experience.

And url to hgt files provided by locus do not exists. Only way is to download them directly in locus when these files are needed
« Last Edit: January 01, 1970, 01:00:00 by Guest »
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Offline tramp20

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Re: SRTM- no attitude in some points
« Reply #16 on: March 15, 2013, 13:14:39 »
Quote from: "menion"
Only way is to download them directly in locus when these files are needed


I tried this too with an empty srtm directory but I got an error processing this (?) and Locus did not try to download the data.

In the meantime I walked (in a little snowstorm) 4 km over a complete plain region near our house (max. 1m height diff) and made than two screenshots:
one without fill altitude and one with offline srtm data..
I had selected heavy altitude filter during recording as always.

You can see the result is terrible.
« Last Edit: January 01, 1970, 01:00:00 by Guest »
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Offline gynta

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Re: SRTM- no attitude in some points
« Reply #17 on: March 15, 2013, 20:15:56 »
Looks like a normal error rate.
It's not really exciting.
It's a smartphone - not an high end geographical instrument.
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Offline gynta

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Re: SRTM- no attitude in some points
« Reply #18 on: March 15, 2013, 20:21:17 »
Quote from: "menion"
...Locus offer for download "only" 3' data, so if you want higher resolution, you need to download them somewhere on your own. Difference in precision was shortly tested on our side and because difference was quite small, we decided to use 3' data due to very high difference in size. Anyway it's up to you, Locus should be able to handle both
thx and to illustrate the difference...
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Offline locuscycling

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Re: SRTM- no attitude in some points
« Reply #19 on: March 15, 2013, 20:47:18 »
How are the difference in Sizes between these ''resolutions''-  It is about megabytes or gigabytes ? ( i am thinking about covering  FULL EUROPA)
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Offline gynta

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Re: SRTM- no attitude in some points
« Reply #20 on: March 15, 2013, 20:52:54 »
sorry, only "ALPS" (840MB) available
http://www.viewfinderpanoramas.org/Cove ... s_org1.htm
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Offline menion

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Re: SRTM- no attitude in some points
« Reply #21 on: March 15, 2013, 21:20:17 »
On pictures, you compare 3' data from locus with 1' data from viewfinder right? On size of alps you may see that 1' are simply nine times bigger ... way too much to store huge areas ...

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« Last Edit: January 01, 1970, 01:00:00 by Guest »
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Offline tramp20

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Re: SRTM- no attitude in some points
« Reply #22 on: March 16, 2013, 06:20:50 »
Quote from: "gynta"
It's a smartphone - not an high end geographical instrument.
This well known of course.
But this shows that the filter should better interpolate : No real height change over 4 km and the srtm data show the same at least on some parts of the track.
« Last Edit: January 01, 1970, 01:00:00 by Guest »
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