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Is it a way to digitize indicating a curve (colored on a white or black or different colour background) from point to point ? I think i've been told that, but i don't KNOW to do it ! Please consider a quite low GIS knowleadge....(sorry)

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I do not fully understand your question. What type of feature are you digitizing (point. polyline, or polygon)? What do you mean by "digitize indicating a curve"? Are you looking to change the background color of the view while digitizing? –  artwork21 Mar 22 '11 at 12:41
    
@artwork21 Sorry.. I mean to 'click' on a line/curve in the raster and to obtain the shp of the whole /or at least a part of line.shp and NOT to Mark points then convert to lines ... –  user2420 Mar 23 '11 at 11:04
    
@mapperz Sorry.. I mean to 'click' on a line/curve in the raster and to obtain the shp of the whole /or at least a part of line.shp and NOT to Mark points then convert to lines ... –  user2420 Mar 23 '11 at 13:48
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1 Answer

You can do the curve between two lines

The points you mention are the 'Tangent Points'

enter image description here

Use the fillet tool enter image description here in the Advanced Editing toolbar in ArcGIS 9.3

You can fix the radius of the curve in the fillet options

More info http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?id=656&pid=642&topicname=Creating_a_fillet_curve_between_two_lines

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