Re: [Talk-at] kittsee - semiautomated import of buildings from basemap.at
Eigentlich eine gute Idee für den Import, aber bitte vorher genau durch diskutieren. Ein Import nur mit Gebäuden halte ich für nicht ausreichend, es müsste unbedingt die volle Adresse angefügt sein. Sonst sinkt die Bereitschaft nachträglich Sachen dazuzufügen oder zu ändern. Ich will nicht meine Orte komplett überarbeiten müssen! Date: Thu, 26 Dec 2013 17:09:08 +0100 From: frede...@remote.org To: talk-at@openstreetmap.org Subject: Re: [Talk-at] kittsee - semiautomated import of buildings from basemap.at -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, before this is imported it would at least need proper documentation on the Wiki import catalogue. In addition to the points mentioned by Michael - * adjacent buildings do not share nodes * no multipolygons at buildings with holes - those would have to be created manually * The buildings are not orthogonalized (q in JOSM) * nodes at very obtuse angles (e.g. 88°) should be removed. I would like to add * source tag on every building (source tag on changeset would be enough) * existing buildings are not reflected - they would have to be removed from the import data. * very small buildings seem to be badly traced (triangular shapes etc) - - perhaps just drop everything below 10 square metres or so. There seem to be a number of mismatches between the data and Bing imagery - but I guess that's because basemap.at is newer? Examples: http://www.remote.org/frederik/tmp/kittsee.png Bye Frederik - -- Frederik Ramm ## eMail frede...@remote.org ## N49°00'09 E008°23'33 -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJSvFSXAAoJEOx/uhGAJu9H1EcH/inTfdlr5O2KTLkIiiueRrfI hZvIjzgCxNvSj2SBgq2gWO3HayE6+X2yzUWOvQH3LCo5h1CT+qtvl1oL3cczlxhJ dn1a0dLAtZ3lgog+GshkRSm2Ih6lvaeWE5VUByZuvlgy4YYC/USXx912+Q5UASdr LkbMRhcdM0QwBY1vgBXOatYnzBONRzkylO1ngFV91Rx6Ggh4hdsAP3bjyf6eyQmC v4SNecG7uNPgC4cmpkM16R9EoKbCuqxhzfmY0QcaqgIFEujiTHbHLU0NqkEAbjys LmBhIiDZdL2RdL0Kp0zQ8uUnN3CLOVPiy9sseYWpXzZpV8Z4a3u9OzfmcCfXOSs= =PT+P -END PGP SIGNATURE- ___ Talk-at mailing list Talk-at@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-at ___ Talk-at mailing list Talk-at@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-at
Re: [Talk-at] kittsee - semiautomated import of buildings from basemap.at
hello all, i've been playing a bit with potrace - a bitmap to vector tool trying to automate building shapes extraction from basemap.at ( http://wiki.openstreetmap.org/wiki/AT/basemap). as this could be considered mass import, i would like to have austrian mapper community checked/approved this first. i am planning to do a few fixes here and there but generally i consider https://db.tt/eUm1BLmg to be ready for upload to osm. please let me know if it meets your quality criteria for imports or just share your thoughts/ideas. vielen dank, jose (greetings from slovakia) ___ Talk-at mailing list Talk-at@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-at
Re: [Talk-at] kittsee - semiautomated import of buildings from basemap.at
On 26/12/13 11:01, Jozef Riha wrote: hello all, Hello Jozef, i've been playing a bit with potrace Impressive result - can you provide a how-to for recreating (and maybe improving) the steps you've accomplished? - a bitmap to vector tool trying to automate building shapes extraction from basemap.at http://basemap.at (http://wiki.openstreetmap.org/wiki/AT/basemap). as this could be considered mass import, i would like to have austrian mapper community checked/approved this first. i am planning to do a few fixes here and there but generally i consider https://db.tt/eUm1BLmg to be ready for upload to osm. please let me know if it meets your quality criteria for imports or just share your thoughts/ideas. I've reviewed it, but there are some flaws which (in my opinion) are blocking the import: * adjacent buildings do not share nodes * no multipolygons at buildings with holes - those would have to be created manually * The buildings are not orthogonalized (q in JOSM) * nodes at very obtuse angles (e.g. 88°) should be removed. vielen dank, Ein großes Danke for your efforts! jose (greetings from slovakia) Greetings, Michael -- Michael Maier, Student of Telematics @ Graz University of Technology OpenStreetMap Graz http://osm.org/go/0Iz@paV http://wiki.osm.org/Graz http://wiki.osm.org/Graz/Stammtisch signature.asc Description: OpenPGP digital signature ___ Talk-at mailing list Talk-at@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-at
Re: [Talk-at] kittsee - semiautomated import of buildings from basemap.at
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, before this is imported it would at least need proper documentation on the Wiki import catalogue. In addition to the points mentioned by Michael - * adjacent buildings do not share nodes * no multipolygons at buildings with holes - those would have to be created manually * The buildings are not orthogonalized (q in JOSM) * nodes at very obtuse angles (e.g. 88°) should be removed. I would like to add * source tag on every building (source tag on changeset would be enough) * existing buildings are not reflected - they would have to be removed from the import data. * very small buildings seem to be badly traced (triangular shapes etc) - - perhaps just drop everything below 10 square metres or so. There seem to be a number of mismatches between the data and Bing imagery - but I guess that's because basemap.at is newer? Examples: http://www.remote.org/frederik/tmp/kittsee.png Bye Frederik - -- Frederik Ramm ## eMail frede...@remote.org ## N49°00'09 E008°23'33 -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJSvFSXAAoJEOx/uhGAJu9H1EcH/inTfdlr5O2KTLkIiiueRrfI hZvIjzgCxNvSj2SBgq2gWO3HayE6+X2yzUWOvQH3LCo5h1CT+qtvl1oL3cczlxhJ dn1a0dLAtZ3lgog+GshkRSm2Ih6lvaeWE5VUByZuvlgy4YYC/USXx912+Q5UASdr LkbMRhcdM0QwBY1vgBXOatYnzBONRzkylO1ngFV91Rx6Ggh4hdsAP3bjyf6eyQmC v4SNecG7uNPgC4cmpkM16R9EoKbCuqxhzfmY0QcaqgIFEujiTHbHLU0NqkEAbjys LmBhIiDZdL2RdL0Kp0zQ8uUnN3CLOVPiy9sseYWpXzZpV8Z4a3u9OzfmcCfXOSs= =PT+P -END PGP SIGNATURE- ___ Talk-at mailing list Talk-at@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-at
Re: [Talk-at] kittsee - semiautomated import of buildings from basemap.at
On 26.12.13 17:09, Frederik Ramm wrote: There seem to be a number of mismatches between the data and Bing imagery - but I guess that's because basemap.at is newer? Examples: http://www.remote.org/frederik/tmp/kittsee.png (ich antworte auf Deutsch) Es ist sehr zu empfehlen, mit geoimage.at zu vergleichen, weil das (meist) das Aktuellste ist. Dort sieht man z.B., dass die nördlichen zwei Fragezeichen offensichtlich abgerissen sind. Das Problem ist, es kann alles veraltet sein, auch basemap.at (scheint mir beim südlichsten Fragezeichen = Gst. Kittsee 203/2 so zu sein). Man sieht aber auch Fehler, z.B. das Haus ganz im NO (2421 Landstraße 13a, Gst. Kittsee 186/2) hat in Wahrheit eine rechteckige Grundfälche, der Algorithmus hat da eine Nische erfunden, die es nicht gibt. Und wie schon gesagt, bitte bestehende Gebäude beachten. Zusätzlich sollte man auch Adressen möglichst vollständig erfassen, was in aller Regel höchstens halbautomatisch möglich ist (Jedenfalls ist die Info, auf welche Straße sich eine Hausnummer bezieht, in basemap.at nicht vorhanden, das muss man wissen oder recherchieren!). /al ___ Talk-at mailing list Talk-at@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-at
Re: [Talk-at] kittsee - semiautomated import of buildings from basemap.at
Thank you all for sharing your views. I chose not to go further with the import - instead I will describe the procedure I used - maybe someone could come up with improvements that would make the result look better/actually usable. - create a basemap.at xml config for mobac (http://mobac.sourceforge.net/), select and export to png file (zoom: 19) - open png file in gimp, select - by color, click on one building, copypaste to new file, threshold, index - 2 colours (potrace requires bi-color image), save buildings into pnm file - potrace -t 100 -k 0.3 -o kittsee.svg -s kittsee.pnm - import to josm (importvec plugin, 10 000 units = 1995 m) - select all ways (^f - type:way - simplify using simplifyarea plugin, using too aggressive values could result in triangular buildings, OTOH too forgiving ones could leave you with too many nodes and/or speckles caused by nearby housenumbers or jpeg artefacts - turn on basemap.at tms background and align, tidy up, add tags All the best, jose On Thu, Dec 26, 2013 at 5:09 PM, Frederik Ramm frede...@remote.org wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, before this is imported it would at least need proper documentation on the Wiki import catalogue. In addition to the points mentioned by Michael - * adjacent buildings do not share nodes * no multipolygons at buildings with holes - those would have to be created manually * The buildings are not orthogonalized (q in JOSM) * nodes at very obtuse angles (e.g. 88°) should be removed. I would like to add * source tag on every building (source tag on changeset would be enough) * existing buildings are not reflected - they would have to be removed from the import data. * very small buildings seem to be badly traced (triangular shapes etc) - - perhaps just drop everything below 10 square metres or so. There seem to be a number of mismatches between the data and Bing imagery - but I guess that's because basemap.at is newer? Examples: http://www.remote.org/frederik/tmp/kittsee.png Bye Frederik - -- Frederik Ramm ## eMail frede...@remote.org ## N49°00'09 E008°23'33 -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJSvFSXAAoJEOx/uhGAJu9H1EcH/inTfdlr5O2KTLkIiiueRrfI hZvIjzgCxNvSj2SBgq2gWO3HayE6+X2yzUWOvQH3LCo5h1CT+qtvl1oL3cczlxhJ dn1a0dLAtZ3lgog+GshkRSm2Ih6lvaeWE5VUByZuvlgy4YYC/USXx912+Q5UASdr LkbMRhcdM0QwBY1vgBXOatYnzBONRzkylO1ngFV91Rx6Ggh4hdsAP3bjyf6eyQmC v4SNecG7uNPgC4cmpkM16R9EoKbCuqxhzfmY0QcaqgIFEujiTHbHLU0NqkEAbjys LmBhIiDZdL2RdL0Kp0zQ8uUnN3CLOVPiy9sseYWpXzZpV8Z4a3u9OzfmcCfXOSs= =PT+P -END PGP SIGNATURE- ___ Talk-at mailing list Talk-at@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-at ___ Talk-at mailing list Talk-at@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-at
Re: [Talk-at] kittsee - semiautomated import of buildings from basemap.at
Jozef Riha schrieb: Thank you all for sharing your views. I chose not to go further with the import - instead I will describe the procedure I used - maybe someone could come up with improvements that would make the result look better/actually usable. Thanks both for the work in figuring this out (as well as trying it and now describing it here) and for not going forward with it in that straight way. For the latter, we unfortunately know that there are many inaccuracies in the basemap.at data so it needs to be looked over by people with local knowledge when taking it as a source for any OSM work. That doesn't mean it's useless, on the contrary it can be very helpful, but it always has to be taken with a grain of salt and verified by other material and ideally people who know the scenery on the ground. Thanks and Cheers, Robert Kaiser ___ Talk-at mailing list Talk-at@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-at
