Hi, > Thank you so much for the fast response. > Sigh! I hoped that netCDF can handle R-tree like data organization. > > I have one more question. > > Have you ever seen any examples of using netCDF4 format to package GIS data > files? > By GIS data files, I mean files like, for example, > Triangular Irregular Network, > Point Clouds (3D), > Shape file, > GeoTiff (this might not be possible) Yes, the "UGRID Interoperability Group" has been working on standard conventions for representing unstructured grids in netCDF, for applications such as ocean models, although that may be limited so far to netCDF-3 representations. You can find out some of the work of members in this group here: https://groups.google.com/forum/?fromgroups#!forum/ugrid-interoperability I know there has been some work on netCDF representation and visualization of LIDAR point-cloud data, but I don't know much about it. UNAVCO was looking into this (specifically Jeff McWhirter), and they may have settled on an RDB representation instead of netCDF, but I haven't been following that. Unidata's IDV software can visualize point-cloud data, but I'm not sure if it depends on conventions for netCDF representation, but you might ask address@hidden I think it would be pretty easy to represent a shape file using netCDF-4, with variable-length and compound user-defined types in a nested varlen of compounds. There was an HDF5 paper a few years back that showed an implementation of shapefiles using those types: http://www.hdfgroup.org/projects/nara/Sci_fmts_and_geodata_HDF.pdf I'm not sure about geotiff, but GDAL software may provide a way of mapping a geotiff into a netCDF representation ... --Russ > Thanks, > -ohig > > > > > > > -----Original Message----- > From: Unidata netCDF Support [mailto:address@hidden > Sent: Sunday, June 09, 2013 8:36 PM > To: Kwoun, Oh-Ig (398B) > Cc: address@hidden > Subject: [netCDF #CUE-552730]: GIS data > > Hi Ohig, > > > I have point cloud data that is intended for GIS application. I want > > to organize the point cloud data in 3D with a structure called R-Tree > > which allows me a quick search in 3-D domain. > > > > http://en.wikipedia.org/wiki/R-tree > > > > Some one told me that I can use netCDF and another separate index file > > to represent my point cloud data. Does anyone know is there is a way > > i can represent point cloud data iin one netCDF file? > > That sounds like a possible approach, but we don't have any experience with > or software for using a netCDF representation of R-Tree data with a separate > index file. Sorry we can't be of more help ... > > --Russ > > Russ Rew UCAR Unidata Program > address@hidden http://www.unidata.ucar.edu > > > > Ticket Details > =================== > Ticket ID: CUE-552730 > Department: Support netCDF > Priority: Normal > Status: Closed > > Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: CUE-552730 Department: Support netCDF Priority: Normal Status: Closed
NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.