Elevation Correction

by pkan

Downloads: 64,344 (30) • Reviews: 11

Version:

1.9

Updated:

Nov 29, 2017

How does the plugin handle bridges and rivers?

How does the plugin handle bridges and rivers?

Postby nadaespecial » Wed Oct 27, 2010 1:53 am

Thanks for the update! I haven't checked it with this version, but in the past, there was always an error message, when I imported my running trails, when I crossed a river. What data will the plugin use if I cross a river on a bridge? It seems that bridges are not part of the available elevation data. Will the plugin use the elevation of the surface (the river) or will it just keep the original elevation of my gps device?

regards,
max
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Re: How does the plugin handle bridges and rivers?

Postby HENNES » Wed Oct 27, 2010 2:06 am

nadaespecial wrote:I haven't checked it with this version


You better do and might find the answer :)

Also in "our area" the tiles are 90m - not sure whether anything really happens.

Here is YOUR bridge: blue line is original data - looks as all of them follow the valley to the river banks and not crawl up the bridge. Dotted line on left image is middle of bridge.



Image



Very good to explore any area on the map with the new tool - you see, it stays on the surface and not on the bridge. Probably need barometric measuring for that.



Image



INTERESTING - checking one of MY bridges, looks as its different sometimes and NOT all follow down to the river banks.



Image




gruss hennes
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Postby nadaespecial » Wed Oct 27, 2010 2:22 am

@ Hennes: Thanks for the research!! This community really works! Some post question, some post answers ;-)
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Postby HENNES » Wed Oct 27, 2010 2:29 am

nadaespecial wrote:@ Hennes: Thanks for the research!! This community really works! Some post question, some post answers ;-)


Questions are allways good, as often they lead oneself to looking deeper into the subject and learn oneself.

:)
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- kickbiking with FR 305 and STs 3

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Re: How does the plugin handle bridges and rivers?

Postby gerhard » Wed Oct 27, 2010 4:09 pm

nadaespecial wrote:What data will the plugin use if I cross a river on a bridge?

pkan's description on the home page covers this:
http://hem.bredband.net/b419940/Elevati ... lugin.html

As SRTM is gridbased, it depends where the point is taken. Briges and narrow valleys are often incorrect. Smaller high structures can affect the areas close by. Elevation close to edges are something in between.

With the latest update, it is easy to see how the calculation is estimated.
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Re: How does the plugin handle bridges and rivers?

Postby texmurphy » Tue Nov 02, 2010 6:16 pm

gerhard wrote:
nadaespecial wrote:What data will the plugin use if I cross a river on a bridge?
Smaller high structures can affect the areas close by. Elevation close to edges are something in between.
With the latest update, it is easy to see how the calculation is estimated.

Example where the height of tree cover (10 to 16 meters) can be estimated by the difference between correctly initialized barometric altimeter elevation and elevation correction elevation.

Image
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