[GRASS-user] extract wind steams from raster

GRASS GRASS user
1

Hi list,

I am totally excitedabout the vector visualizations of Wind Map* and Earth
Wind**. So I'm now trying to extract this kind of vector from meteorological
grib files, which has set the wind parameters angle and speed per cell.

I tried to work with r.to.vect, but this seems to be not the best starting
point, because the stream vectors must be calculated before. Right? Could
you please give me any hints to extract some kind of wind stream vectors?

Thank you very much and best regards,
teeschke

*http://hint.fm/wind/
** http://earth.nullschool.net/

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2

On Sat, Sep 27, 2014 at 8:28 AM, teeschke <daniel.teske@web.de> wrote:

Hi list,

I am totally excitedabout the vector visualizations of Wind Map* and Earth
Wind**. So I'm now trying to extract this kind of vector from
meteorological
grib files, which has set the wind parameters angle and speed per cell.

Hi, I was also excited.

I tried to work with r.to.vect, but this seems to be not the best starting
point, because the stream vectors must be calculated before. Right? Could
you please give me any hints to extract some kind of wind stream vectors?

So, I have created:

https://github.com/ncsu-osgeorel/comet-like-visualization

the result can be seen here:

http://geospatial.ncsu.edu/osgeorel/foss4g-2014-spatio-temporal-visualization.html

Let me know what do you think. There is not much documentation but it
should be pretty clear, although it is quite sensitive to sizes, so you
must be careful in setting region right.

Vaclav

Thank you very much and best regards,

teeschke

*http://hint.fm/wind/
** http://earth.nullschool.net/

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http://osgeo-org.1560.x6.nabble.com/extract-wind-steams-from-raster-tp5164542.html
Sent from the Grass - Users mailing list archive at Nabble.com.
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