This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Brian, At this point in time, there is nothing within GEMPAK to make this type of computation as you require. I would be possible to write a program to accumulate the number of strikes within a given radius of a grid point. The other limitation you would have is that a 3km grid is going to be a very large grid if you are attempting to cover the entire country with a single grid. At present time, the default maximum number of grid points in a file is 400,000. A 4km national grid is approximately 1,200,000 points. If you are doing a regional (or series of regional) grids then that won't be a problem. Steve Chiswell Unidata User Support >From: Brian Colle <address@hidden> >Organization: UCAR/Unidata >Keywords: 200110192245.f9JMje123521 > >Hi, > >I have some gempak lightning data (surface files of sgnl strength) that I >want to interpolate to a uniformly spaced 3-km gempak grid such that each >grid point has the number of nearby strikes. With this gridded file I can >then contour the number density up in gempak. > >Do you have any ideas or sample code how I can do this interpolation >of lightning data within gempak or interfacing gempak with f77? > >I appologize in advance for the loaded question, but I am looking >for ideas at this point. > >Thanks for your time... > >Brian >____________________________________________________________ >Prof. Brian Colle INTERNET: address@hidden >(631)632-3174 >Institute for Terrestrial and Planetary Atmospheres >Marine Sciences Research Center >State University of New York at Stony Brook >Stony Brook, NY 11794-5000 >