I will hence align with building base. Thank you for your reply.

Sent from my iPhone

> On 12 Jun 2015, at 11:54, Florian Lohoff <[email protected]> wrote:
> 
>> On Fri, Jun 12, 2015 at 11:16:41AM +0200, Arne Jakobsson wrote:
>> Hi all,
>> I draw buildings, and was taught somewhere that we should align the building 
>> outline with its roof. Doing this, I ran into some trouble. 
>> http://i.imgur.com/vaOFIb5.gif
>> The road intersect the building. This would not happen if we instead just 
>> kept to aligning the building outline with its base.
>> Is there a right way to do this?
> 
> Typically you dont have exact images from the top as you can see on your
> image. So you would take the roof as the measurement because it can be
> seen completely and make it a box. Then you shift the box until the
> corner matches the ground truth of the building. We map stuff at ground
> level typically. 
> 
> Then your road will not overlap the roof - its just a
> imaging/parallax/projection issue you have.
> 
> Flo
> -- 
> Florian Lohoff                                                 [email protected]
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