There aren't any decent Yahoo aerial images of the area I live in, so my 
tracing from same has been limited to the occasional bit elsewhere.

 

Today I tried adding some of the houses in Harlow near where my brother-in-law 
lives (and an area I visited on foot yesterday). I traced them in Potlatch at 
whichever the highest zoom level is where the images still show.

 

But how do you make them look rectangular/square/etc? Is there an easy way or 
do you just have to nudge the nodes until they look about right? I find the 
lines and yellow highlighting in Potlatch make it next to impossible to 
accurately aim some of the nodes for items such as this.

 

The area in question is:

http://www.openstreetmap.org/?lat=51.76549 
<http://www.openstreetmap.org/?lat=51.76549&lon=0.147&zoom=17&layers=0B00FTF> 
&lon=0.147&zoom=17&layers=0B00FTF

 

I was wondering whether I could perhaps download the area in JOSM and use the 
orthogonalize menu option (or however it is spelled) on each way as I believe 
that is to do something along those lines. I did try it somewhere recently for 
something else, though I forget what, and it warned me that my projection 
method might lead to inaccuracies and prompts me to change it. I’m using 
whatever the default JOSM projection is, and don’t understand the choices 
offered.

 

Thanks for any tips. 

 

Ed

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