NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Unidata Support wrote:
To: support-idv@xxxxxxxxxxxxxxxx From: "Stuart Wier" <wier@xxxxxxxxxx> Subject: IDV - NetCDF data files with curvilinear coordinates / CF convention Organization: UCAR/Unidata Keywords: 200512191651.jBJGpYJU012442Institution: unavco Package Version: 1.2 Operating System: linux Hardware Information: the ususal Inquiry: I have a GEON IDV user who wants to see seismic tomography (seismic velocity values in 3D) from a 3D volume data grid. His data file is a collection of what are unique longitude-latitude pairs for each grid point at each depth: long lat depth Pv138.717 37.1541 9 5.8325 138.773 37.1542 9 5.9639 138.829 37.1543 9 6.1133 138.886 37.1543 9 6.1892 138.942 37.1543 9 6.0828 138.998 37.1543 9 5.9052 139.054 37.1543 9 5.8052 139.111 37.1543 9 5.8607 139.167 37.1542 9 5.9771 139.223 37.1541 9 6.0249(there are 17 megabytes of this, spanning about 100 depth levels. The depths are regular: identical 2D grids for each depth.)I suspect that this is a regular rectangular x-y grid mapped onto longitude-latitude locations.I recall this can be handled by the CF convention if enough is known about the projection, right? What exactly is required in the NetCDF file, and is there an example of a NetCDF file to use as a guide?
Yes, he can use the CF conventions. Just have a 2D lat and a 2D lon variable, see section 5.6 of CF manual. Basically you have: float dataVariable(x,y,z); :coordinates="lat lon";float lat(x,y); float lon(x,y); float z(z);
If its really from a projection (and its one we can deal with) then thats a more efficient way to go.
Stu -- 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.
netcdf-java archives: