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#1 2017-09-18 10:58:52

Władysław Komorek
Member
From: Kraków, Poland
Registered: 2012-06-30
Posts: 1,726
Website

Imagery

I noticed that a lot of entities are shifted.
This poses a big problem with adding more entities.
I think some editors have, in settings, some offset value.
Please reset the offset.

If you use Bing, set the offset to 0 for Nepal.
So far, the best is DigitalGlobe Premium Imagery with offset=0

Last edited by Władysław Komorek (2017-09-18 23:42:21)

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#2 2017-09-22 03:56:03

g246020
Member
From: USA
Registered: 2014-08-18
Posts: 48

Re: Imagery

Is there a more scientific approach to setting offset,perhaps geological survey makers visible on imagery?

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#3 2021-04-30 17:42:13

Władysław Komorek
Member
From: Kraków, Poland
Registered: 2012-06-30
Posts: 1,726
Website

Re: Imagery

According to locals, it can be a fairly good offset:
https://www.openstreetmap.org/#map=19/28.20289/83.96488

So far for Bing it is about 6.6, -5.39.
Most entities will need to be moved or re-placed.

Marek Kleciak supposes that the more precise 3 points from DGPS will be in a week.

Last edited by Władysław Komorek (2021-04-30 17:44:23)

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#4 2021-06-09 21:05:09

seichter
Member
Registered: 2011-05-21
Posts: 3,120

Re: Imagery

Imagery offset can be estimated from roads with several GPS tracks, mostly H- and F-roads.
I have found Bing to be typically exact to less than 3 m.
But attention: Offset can change by dozens of meters in mountain areas because of inexact correction of slant images by insufficient elevation data (DEM model).
A strong indication of such problems are blurry parts in the imagery especially at steep mountain flanks.

There is no constant offset in any imagery.

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