[Qgis-user] Re: measure angle tool

[ALT SHN]

 don't know the answer but I have another question related to these one.

Why is it when I use the aspect tool of GRASS (r.slope.aspect) the results
are given from the East in a counterclockwise?! (i.e East is 0º, North is
90º and so on...)

I only realized this because I always check the results, but I bet there are
many people out there who assume that 360º/0º is North and are having
inconsistent results....

regards,

Andre

2010/8/24 Tom <mtnbiketrail at zzz.com>

 Why is it when I use the "Measure angle tool"(grouped with the "info"
> tool), if I draw a line from 0 and then run the cursor around it a clockwise
> circle, the measured value goes  0 to 180 and  -179 to -1 to 0, I want to
> measure the obtuse angle like a compass, 0-360. nothing in the help files. I
> have no clue if this is a built in plugin or add-in.
>
> Also, I can't seem to get the Azimuth and distance plugin tool(0.8.5) to
> work.  I want to draw a line that is true North. NO instructions on their
> website.
>
> And I'm using these to compare true north to magnetic north as
> georeferenced raster files. The raster files are drawn to magnetic north,
> with lines going to the 4 cardinal points as magnetic, but my base map
> projection is in True North(+proj=utm +zone=10 +ellps=WGS84 +datum=WGS84
> +units=m +no_defs). I want to georeference using magnetic bearings.  I know
> the declination and the base map(geotiff) is correct.
>
> thanks,
> Tom
>
>
>
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>



-- 
---------------------------------------------------------------
Associação Leonel Trindade
SOCIEDADE DE HISTÓRIA NATURAL

Apartado 25 2564-909 Torres Vedras Portugal
Sede e Biblioteca: rua Cavaleiros da Espora Dourada, 27A 2560 Torres Vedras

Laboratório de Paleontologia e Paleoecologia: Polígono Industrial do Alto do
Ameal 2565-641 Ramalhal
http://alt-shn.blogspot.com
www.alt-shn.org



-- 
---------------------------------------------------------------
Associação Leonel Trindade
SOCIEDADE DE HISTÓRIA NATURAL

Apartado 25 2564-909 Torres Vedras Portugal
Sede e Biblioteca: rua Cavaleiros da Espora Dourada, 27A 2560 Torres Vedras

Laboratório de Paleontologia e Paleoecologia: Polígono Industrial do Alto do
Ameal 2565-641 Ramalhal
http://alt-shn.blogspot.com
www.alt-shn.org
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