Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Hi Don, thanks for the prompt reply.I did try the geosubsetting in idv 1.3b2, but it didn't quite do what I needed. My subgrid is actually defined by grid points, or equivalently, kilometers, rather than lat lon as catered for by IDV. My grid has a lambert conformal projection from x,y to lat,lon. So I completed a nice netcdf filter app which takes index ranges for coordinate variables and uses Array.section to dice up the data.
Also, in trying to display my data (wind speed) in IDV as knots rather than ms-1, I don't see a 'Change Display Unit' in the Edit menu of the display control (I tried all three Plan Views with same result). The User's Guide mentions that 'Some displays allow you to change the unit that is used in the display' but doesn't state exactly which ones ?
Thanks again. BTW if anyone is interested in my netcdf filter app, i can post it. Stuart Maclean Don Murray wrote:
Hi Stuart- Stuart Maclean wrote:I have a netcdf file of an mm5 model output. One variable is max wind speed, defined over a 2d grid, with values every 3 hours. The nc file has CF conventions in place so IDV can display it.I would like to perform two transformations on the data in order to display it in idv:1 create a smaller area. the orig grid is say 100x100 and I want to view just say an inner box of 20x20. I know I can zoom in on the area but the mere presence of the full grid has influence on the contouring/display so I would prefer to clip the data firstWith the 1.3B2 release, if you double click on the data source in the Field Selector, it will bring up the dialog for setting the properties on that file (or right click and select Properties). Under the Geo-Subsetting tab in the dialog, you can subset by stride (every Nth point) and/or by geographic location. This will apply to any displays you create with that grid. In the next release, you will be able to do this at the dataset or at the parameter level (like with Times). This will clip the data and just read out what you have defined.2 the units from the model are ms-1. i would like to display (and contour) in knots.Once you have your display loaded, you can use the Display Control's Edit->Change Display Unit.. menu to set the unit to knots. If you want this to be the default, then use the Parameter Defaults Editor (Edit->Resources->Parameter Defaults menu) to set the default unit for your variable.I suspect that the first task cannot be done in IDV. I had hoped that NcML would provide some filtering leverage like this, but I haven't found it.Try the Geo-subsetting.The unit conversion can be done in IDV ??Yes.Any help gratefully appreciatedIf this doesn't work, let us know. Don ************************************************************* Don Murray UCAR Unidata Program dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000 (303) 497-8628 Boulder, CO 80307 http://www.unidata.ucar.edu/staff/donm *************************************************************
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