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 Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated.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.
>From: "Rob Redmon" <address@hidden> >Organization: NOAA >Keywords: 200411031545.iA3Fj8vV029743 Hi Rob- >Hi Don, I'm writing regarding our conversation about grid sampling >and interpolation during the IDV workshop. The resampling in VisAD/IDV is done as follows: The samples are organized in a topology, which may be triangles (Irregular2D), squares (Gridded2D), tetrahedra (Irregular3D) or cubes (Gridded3D). For target points the system finds which topology element contains the target. For nearest neighbor, it gets the values at the vertex of that containing topology element closest to the target point. For weighted average, its computes a weighted average of all vertices of that containing topology element, where the weights are bilinear in 2-D and trilinear in 3-D. (from Bill Hibbard). >I believe you mentioned >something about an Australian (?) group that may be writing a related >package and I'm definitely interested in learning more about that. Contact James Kelley (address@hidden) about his Barnes Analysis code. Tell him I sent you. Eventually, we'll add that to the IDV, but you might want to use it in it's raw form. >You also mentioned forwarding me some WMS info. From the Catalog Chooser, try the following URL: http://globe.digitalearth.gov/viz-bin/wmt.cgi?REQUEST=GetCapabilities&VERSION=1.1 This will bring up an interface that allows you to select some images from the GLOBE project's WMS server. This is really only alpha code. Pick a field like Air Temperature->Maximum Temperature (map doesn't do anything right now), then click Add Source. From the Data Selector, display the field as a 3 Color (RGB) image. It should display in the main window. >Thanks again for a great workshop! Thanks for attending and using the IDV. Let us know if you have more questions or suggestions. Don 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.