Re: [OSM-newbies] Buildning alignment
On 12/06/2015 10:16, 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? Personally I always try and align building footprints with the base rather than the roof (otherwise very tall buildings would look very odd indeed). I can see why (if you were mapping lots of small buildings in e.g. a HOT response) it would be easier to say just trace the roofs - it'd get more buildings traced quickly at a good enough quality (which surely is the aim there), but as a general principle where time isn't an issue I'd certainly try and trace the building footprint. Cheers, Andy ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
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 f...@zz.de We need to self-defense - GnuPG/PGP enable your email today! signature.asc Description: Digital signature ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
Hi Arne, I was always taught to align buildings with their base. Often the easiest way to do this is to trace the outline of the roof and then move the whole shape to align with the base but either way, the base should be aligned. This is to avoid exactly this type of problem. I'm not sure where you got the information to align to the roof but if it's somewhere public we should probably make sure that it is changed. Cheers, Matt On 12 June 2015 at 10:16, Arne Jakobsson kimmybjons...@icloud.com 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? ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies -- Matt Williams http://milliams.com ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
Hi Arne, If it were me, I would just move the road outside as in reality it doesn't pass through the building. This am sure is as a result of the height of the building, Hope this helps. Best, - Enock twitter: @Enock4seth enockseth.github.io | [[User:Enock4seth]] On Fri, Jun 12, 2015 at 9:16 AM, Arne Jakobsson kimmybjons...@icloud.com 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? ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
Thanks all. Best, - Enock twitter: @Enock4seth enockseth.github.io | [[User:Enock4seth]] On Fri, Jun 12, 2015 at 10:15 AM, Florian Lohoff f...@zz.de wrote: On Fri, Jun 12, 2015 at 10:56:30AM +0100, SomeoneElse wrote: On 12/06/2015 10:16, 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? Personally I always try and align building footprints with the base rather than the roof (otherwise very tall buildings would look very odd indeed). I can see why (if you were mapping lots of small buildings in e.g. a HOT response) it would be easier to say just trace the roofs - it'd get more buildings traced quickly at a good enough quality (which surely is the aim there), but as a general principle where time isn't an issue I'd certainly try and trace the building footprint. As the parallax-shift is the same for the full of the sat image you can also draw 100 Buildings and shift them at once Just make shure that you are not shift already shifted buildings or buildings taken from images with a different parallax problem. Flo -- Florian Lohoff f...@zz.de We need to self-defense - GnuPG/PGP enable your email today! -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (GNU/Linux) iQIVAwUBVXqxJ5DdQSDLCfIvAQoYMA//fGGr9tObN6hJbVBLkisP7wFoaW04bUDl bN9xIG1YKvi0E6Vphut8aJtsifkwDW4OjfJulazdT9TIvI/J1R1E/IHV165s077R vxGXCPJfkdiRyJyapwsl6IUfQFt0OxaTq3ZyTHRSr26BesGX0kzy8Fel4CVFYR3R xQs5ZKAe00QjIkpkdPtzQCOmO/0v8eJuYQ2KeQIEk9ybTx/XZ4i00stJGBPEvNWV PgGBFVvmarvAZlgd52Eq0MaI05okHM4YuTZo0u7o7DOBIrr46ucV0n/g2eoHiHQB 6/s7R3pkCywQaz39Z7oDCqpBs5uqj/UjyvaYJafmUHVmF6jFnPdYAtPucJDIlJqW ENikd5Mckf1Gcm8Yw4X/5pYHiDGuJWCcwJ1S9fJanz2hZuSWt28PTKGaiLHDu+Ng rf+1lVIUQAacY7ZgRzrntRW0oH8ZnZaH758THrbWj87c5e8T3pLeZA5TMtosSF+B Pk+G1k6AZK1m8qvBiltqJWaf2wJuDBDggTjA4PWhZgFkoLUU8uuphm1lqyX07DVJ 4Bq3VU/GtqldLAOme4TKRb7G8gy6dzbHJm6sif/oq8pdU6orDQTBVZUse9FQLuXG w1GoXqZ9p9Gsd85cn1mtCmO7B4eDDBXZSD06RWz7wv/l4GrWjNQdygFKaEAvbfrd 7A7ggMKyqiM= =6dWh -END PGP SIGNATURE- ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
Sent from my iPhone On 12 Jun 2015, at 12:15, Florian Lohoff f...@zz.de wrote: On Fri, Jun 12, 2015 at 10:56:30AM +0100, SomeoneElse wrote: On 12/06/2015 10:16, 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? Personally I always try and align building footprints with the base rather than the roof (otherwise very tall buildings would look very odd indeed). I can see why (if you were mapping lots of small buildings in e.g. a HOT response) it would be easier to say just trace the roofs - it'd get more buildings traced quickly at a good enough quality (which surely is the aim there), but as a general principle where time isn't an issue I'd certainly try and trace the building footprint. As the parallax-shift is the same for the full of the sat image you can also draw 100 Buildings and shift them at once Just make shure that you are not shift already shifted buildings or buildings taken from images with a different parallax problem. Flo -- Florian Lohoff f...@zz.de We need to self-defense - GnuPG/PGP enable your email today! ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
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 f...@zz.de 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 f...@zz.de We need to self-defense - GnuPG/PGP enable your email today! ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
On Fri, Jun 12, 2015 at 10:56:30AM +0100, SomeoneElse wrote: On 12/06/2015 10:16, 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? Personally I always try and align building footprints with the base rather than the roof (otherwise very tall buildings would look very odd indeed). I can see why (if you were mapping lots of small buildings in e.g. a HOT response) it would be easier to say just trace the roofs - it'd get more buildings traced quickly at a good enough quality (which surely is the aim there), but as a general principle where time isn't an issue I'd certainly try and trace the building footprint. As the parallax-shift is the same for the full of the sat image you can also draw 100 Buildings and shift them at once Just make shure that you are not shift already shifted buildings or buildings taken from images with a different parallax problem. Flo -- Florian Lohoff f...@zz.de We need to self-defense - GnuPG/PGP enable your email today! signature.asc Description: Digital signature ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
Are you sure moving THE ROAD is the way to go? I mean, the road is where it is. A map map roads primarily. Having posted this issue here I have now come to my own conclusion to always stick to aligning with building bases and not roofs. Depending on the angle the aerial photo was taken, the building roof will displace by a varying amount and thus cover objects behind it. Thank you for your reply though, it made the issue more clear to me. On 12 Jun 2015, at 11:36, Enock Seth Nyamador kwadzo...@gmail.com wrote: Hi Arne, If it were me, I would just move the road outside as in reality it doesn't pass through the building. This am sure is as a result of the height of the building, Hope this helps. Best, - Enock twitter: @Enock4seth enockseth.github.io | [[User:Enock4seth]] On Fri, Jun 12, 2015 at 9:16 AM, Arne Jakobsson kimmybjons...@icloud.com 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? ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
Thanks for the tip! I will keep that in mind when re-iterating, correcting previous work. Sent from my iPhone On 12 Jun 2015, at 12:15, Florian Lohoff f...@zz.de wrote: On Fri, Jun 12, 2015 at 10:56:30AM +0100, SomeoneElse wrote: On 12/06/2015 10:16, 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? Personally I always try and align building footprints with the base rather than the roof (otherwise very tall buildings would look very odd indeed). I can see why (if you were mapping lots of small buildings in e.g. a HOT response) it would be easier to say just trace the roofs - it'd get more buildings traced quickly at a good enough quality (which surely is the aim there), but as a general principle where time isn't an issue I'd certainly try and trace the building footprint. As the parallax-shift is the same for the full of the sat image you can also draw 100 Buildings and shift them at once Just make shure that you are not shift already shifted buildings or buildings taken from images with a different parallax problem. Flo -- Florian Lohoff f...@zz.de We need to self-defense - GnuPG/PGP enable your email today! ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
Re: [OSM-newbies] Buildning alignment
I haven't had any training in this, but as soon as I outlined my first couple of buildings on OSM a few months ago, the solution as described by Matt Williams quickly jumped out as the correct approach. Also, I have to respectively disagree with Florian's statement As the parallax-shift is the same for the full of the sat image you can also draw 100 Buildings and shift them at once. on two counts. Firstly, if the photographic axis is truly vertical, then the parallax shift is in opposite directions to the right and left of the photo centre (i.e. the buildings will all be appearing to lean away from the centre of the photo. Secondly, the shift in the roof of a 50 floor building will be 5 times that of a 10 floor building at the same location. While I don't disagree with shifting several buildings concurrently, I should think that they should be relatively close to each other and roughly the same height. Bill From: Florian Lohoff f...@zz.de To: Help for newbie mappers newbies@openstreetmap.org Sent: Friday, June 12, 2015 6:15 AM Subject: Re: [OSM-newbies] Buildning alignment As the parallax-shift is the same for the full of the sat image you can also draw 100 Buildings and shift them at once Just make shure that you are not shift already shifted buildings or buildings taken from images with a different parallax problem. ___ newbies mailing list newbies@openstreetmap.org https://lists.openstreetmap.org/listinfo/newbies
