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 <[email protected]> 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 > > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > -- --------------------------------------------------------------- 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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