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> _______________________________________________ gdal-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/gdal-dev
