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</o:shapelayout></xml><![endif]--></head><body lang=IT link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>GRASS users and developers.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>In GRASS6.4.2RC3 with wxpython GUI the option 'Add raster cell arrows' seems not to work properly. It seems that the arrows in the Map Display cannot zoomed in..<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>It can be checked by the following steps:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>Load and display the aspect (Spearfish) map.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>Open the d.rast.arrows panel through the GUI button and choose the same map aspect.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>Click Apply: the Map Display appears green as espected for the very high resolution. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>Choose 10 for the 'Draw arrow every Nth grid cell:' option and none as 'Color for drawing grid or </span><span lang=EN-US>“</span><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>none</span><span lang=EN-US>”</span><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>' option. The arrows are displayed on the cells of aspect map.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>To make the arrows visible choose slope as 'Raster map containing values used for arrow length:' and 10.0 as 'Scale factor for arrows'.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>Zoom in a very small area: the cells of aspect map are enlarged, but the density of arrows remains the same <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>The direction is correctly the same for all arrows inside the same cell but it seems that instead of having an arrow each 10 aspect cells, there is an arrow each 10 pixel of the screen.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>Something wrong in my procedure or is this a bug in wxpython GUI (with tcltk GUI the procedure works fine)?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'> A. Clerici<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"DejaVu LGC Serif","serif"'>Parma University<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></div></body></html>