> -----Original Message----- > From: Bernd Vogelgesang [mailto:[email protected]] > Sent: Saturday, November 17, 2012 6:26 PM > To: Jake Maier > Subject: Re: [Qgis-user] entering distance and bearing for polygon or > polyline > > welcome to the show ;) > > actually i had a similar problem a few days ago, and i can tell you, it > was no fun. > I didn't find any native solution. > > My use case (though i do not know yours): > I had to draw new transect lines, i knew the starting coordinate, the > distance (50m always) and the bearing. > In addition to that, I had to draw 2*2 m polygons, each 10 meters of > this line, starting at 5 m. > > So, there is the quite useful "improved polygon capturing" plugin which > also handles polylines. > With this, you can set a fixed length for the drawing of a line segment > or polygon side. > > BUT, unfortunately it won't show the current bearing while drawing, nor > can you set it (I already humbly asked the creator to maybe add this > feature if possible). > > So, option #1 is to take a transparent triangle like you use in school, > hold it to the screen and draw your lines (ughh). > Option #2 is a lot of work, but more accurate: > > I entered my starting coordinates (x,y), bearing (alpha) and distance > in excel and used sin(or cos)(radians(alpha))*distance + x(or y) > (sorry, I do mix up sin and cos all the time, so better check yourself) > to retrieve my end coordinates. > Then i copied the calculated coordinates in separate rows like x,y > x1,y1 > x2,y2 > x1,y1 > x2,y2 > etc. > > Then, i added an id column, to indicate which point pairs should form > the line id,x,y > 1,x1,y1 > 1,x2,y2 > 2,x1,y1 > 2,x2,y2 > etc. > > Then, I imported this table as csv with the help of the mmqgis plugin - > > Transfer -> Geometry Import from CSV File > > Lines were done. > > Polygons were designed this way: > Transect Lines: Vector -> Geometry Tools -> Densify Geometry -> Factor > 9 = a new vertex every 5 meters > > With "Cad Tools" plugin, i created a parallel line to my transect line, > distance 2 m. > > Densify Geometry with factor 24 to get 2m-segments on this line. > > Snapping options the transect layer set to segment and vertex and for > the Cad Line to vertex. > Starting to draw the polygon with the "improved polygon capturing" with > 2 meters at 5m-vertex on the transect, snapping to the segment, then > snapping to the Cad Line vertex, right click on next vertex to finish > the polygon. > and so on and so on and so on ... > > Maybe there is an easier way for that, but i couldn't find it. > > I hope sth of this may help you to find an idea for your problem. > > Greetz > Bernd
The Azimuth and Distance plugin does the trick Thanks Jake _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
