Good idea. I think it will work. I'll implement that.
Thanks, Hongwei On Fri, Jan 6, 2012 at 4:10 PM, Howard Butler <[email protected]> wrote: > If you do work to add this, you'll probably just need to add a seek() method > to the liblas::Writer class (and underlying implementation classes) that > positions the stream. After that liblas::Writer::WritePoint() should > overwrite the data, though you may want to do some header checks to make sure > that the size in bytes of the point is the same as the size in bytes that the > file is expecting -- otherwise you'd start clobbering data. > > On Jan 6, 2012, at 2:36 PM, Hongwei Shen wrote: > >> Thank you for the answer, Howard. >> >> I'll check if I can add this support. >> >> Thanks, >> Hongwei >> >> >> On Fri, Jan 6, 2012 at 1:47 PM, Howard Butler <[email protected]> wrote: >>> >>> On Jan 6, 2012, at 12:16 PM, Hongwei Shen wrote: >>> >>>> Hello, >>>> >>>> The scenario is: the user opens a large Lidar file, changes the >>>> classification labels of a small number of points and save the changes >>>> to the file. When the Lidar file is huge, it is time-consuming to >>>> output all the points. So it would be better if only the modified >>>> points are updated in the Lidar file. According to my understanding >>>> now, Liblas needs to save all the (changed and unchanged) points to a >>>> new Lidar file. That's because Liblas can open a Lidar file either in >>>> read-only mode or write-only mode, but not in read-write mode. >>>> >>>> Do I understand correctly? Is there a way to only update some points? >>> >>> >>> Yes, your understanding is correct. libLAS does not support in-place >>> updating of points. >>> >>> Howard >>> > _______________________________________________ Liblas-devel mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/liblas-devel
