I guess the OP can answer for themselves but I am curious since I cannot see anyway that Cityxxx would facilitate the conversion of an .obj into GeoJSON ?
On Wed, 2 Dec 2020 at 12:49, Clay, Bruce <[email protected]> wrote: > Take a look at CityXml / CityGml and CityJson. There is partial support > at least in GDAL based on web searches. Also some support for QGIS through > a plugin > > > Bruce > > > ________________________________ > From: gdal-dev <[email protected]> on behalf of Paul > Harwood <[email protected]> > Sent: Wednesday, December 2, 2020 5:31 AM > To: Andrew C Aitchison > Cc: [email protected] > Subject: [EXTERNAL] Re: [gdal-dev] Converting OBJ to Geojson files with > ogr2ogr > > .OBJ is a simple object mesh (or to put it in more traditional terms: > TIN) - it has shape but no data values and is not geolocated. > > I don't think there is any driver for OGR that will read .OBJ. > > You are going to problems with geolocation if you write your own. Geojson > requires that the geometries are geolocated - and in the current version > that they are in epsg:4326. That is not totally impossible - people have > been using .dxf files for gis data for decades and that format is also not > in theory geolocated. It is not a trivial problem though. > > I guess I would ask the usual question .. why? > > - what are you actually trying to achieve and why a GIS format like > GeoJSON? > > - If you have to use GeoJSON - I am guessing you are transferring some > data to something that reads GeoJSON only? In that case - can your source > produce .dxf? OGR can read .dxf. > > - If you only have the source in .OBJ - what other formats can the > destination read? Although, if you only have the source in .obj, I very > much doubt any of the GIS tools like GDAL are going to be able to help you. > It just is not a format used in GIS. > > It is a problem we solved in the ViRGiS projec< > https://usg02.safelinks.protection.office365.us/?url=http%3A%2F%2Fwww.virgis.org%2F&data=04%7C01%7C%7C0da679eff03c4694022308d896ad7f40%7C3430c5de5e6f4f9d9d9690e985038b58%7C0%7C0%7C637425019296346911%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=P2rkx2BIsKJ0GPY3EdGesGO%2B9Az%2FTB5s0f9YMRkH%2FH0%3D&reserved=0>t > - since .obj is used a lot in VR. There we used an existing library to read > the .obj files - but that is in C# and I doubt that would help you. > > On Tue, 1 Dec 2020 at 20:15, Andrew C Aitchison <[email protected] > <mailto:[email protected]>> wrote: > On Tue, 1 Dec 2020, Brandon Biggs wrote: > > > Hello, > > I am wondering how to convert an obj file to a geojson file? I am using > ogr2ogr with the command: > > Ogr2ogr -f geojson output.geojson input.obj > > But get the error that ogr2ogr does not have an OBJ driver. I looked on: > > the vector drivers page<https://gdal.org/drivers/vector/index.html< > https://usg02.safelinks.protection.office365.us/?url=https%3A%2F%2Fgdal.org%2Fdrivers%2Fvector%2Findex.html&data=04%7C01%7C%7C0da679eff03c4694022308d896ad7f40%7C3430c5de5e6f4f9d9d9690e985038b58%7C0%7C0%7C637425019296346911%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=YlMoWYX%2FArELUfRlhGmaqSd8H%2BQeyhJKoWz2FZSQoNM%3D&reserved=0 > >> > > but am unable to find a simple obj converter. I am wondering if there is > such a thing? I am probably going to write my own that does what I want, > because OBJ is so simple, I was just wondering if GDAL could already do it. > > I've never heard of OBJ, but that doesn't mean much. > > If you only want a read-only ogr driver you might want to look at > https://gdal.org/tutorials/vector_python_driver.html< > https://usg02.safelinks.protection.office365.us/?url=https%3A%2F%2Fgdal.org%2Ftutorials%2Fvector_python_driver.html&data=04%7C01%7C%7C0da679eff03c4694022308d896ad7f40%7C3430c5de5e6f4f9d9d9690e985038b58%7C0%7C0%7C637425019296356903%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ulnrpqd06IeuubvWwEkSSFhsPUWFw9rsfdYfGWf0zis%3D&reserved=0 > > > if you would find a quick-n-dirty python quicker to write than C++. > > -- > Andrew C. Aitchison Kendal, UK > [email protected]<mailto: > [email protected]> > _______________________________________________ > gdal-dev mailing list > [email protected]<mailto:[email protected]> > https://lists.osgeo.org/mailman/listinfo/gdal-dev< > https://usg02.safelinks.protection.office365.us/?url=https%3A%2F%2Flists.osgeo.org%2Fmailman%2Flistinfo%2Fgdal-dev&data=04%7C01%7C%7C0da679eff03c4694022308d896ad7f40%7C3430c5de5e6f4f9d9d9690e985038b58%7C0%7C0%7C637425019296356903%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=teiA9QIidI%2F3%2FdzekPU0zwZ%2FySofRSBD1D5OMhPsndc%3D&reserved=0 > > >
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