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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.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.
Hi Sara,
The xidv files are "'bundle" files which are what the IDV saves off to capture and recreate the application state.I am new to using IDV and I am trying to create images using ISL.I have been working through examples in the IDV User's Guide and Tutorial. The example ISL file display.isl comes closest to what I want to do, but I cannot get this ISL file to run properly. I don't know how to create the template.xidv it needs.
When you are running the idv simply go to the File->Save As... menu.You will be prompted for a bundle file name. You can then load in that bundle file later to
recreate what you were looking at.As a convenience you can also do a File->Save As and enter a ".isl" file name. This will save off the bundle xidv file as normal and also generate an example isl
file that loads the bundle in and creates an image or a movie.It looks as though you are using the <datasource> and <display> tags in the isl to create your imagery. A caveat with those - those tags have not been exercised very well and I am sure there is lots of missing
functionality. We are always looking for input on what is missing, etc.I'm not sure what your requirements are but you might want to start off with the isl/bundle combination described above. This allows you to create exactly the displays you want interactively and then capture them later with the isl. There are facilities in the isl to switch the data sources (e.g, from one ruc file to another) that are being loaded.
I am having trouble creating an ISL file to generate images for various parameters in a data source. For starters, I am using small_ruc_grid.nc simply because it is available to use. Here are some questions I have:1) Is it possible to get some example ISL files for how one can create images to answer the below questions using small_ruc_grid.nc or some other readily available file?
The best source right now is the user guide ISL section: http://www.unidata.ucar.edu/software/idv/docs/userguide/isl/DataAndDisplays.htmlWe are intending in the next month to make available more example isl files and better examples of generating real time imagery.
2) How does one list all possible values for "param" and "type" to use with a dataset?For the available parameters that is best done by loading the data file into the IDV and looking at the available fields in the Field Selector. For the display types I am attaching a listing of the types and their description.
3) How does one determine the range of valid values for each parameter? For example, if I want to create a contour plot for temperature, how can I determine the minimum and maximum temperature values that are used to create the contour plot?
For contouring the idv uses
4) How are color filled contours and color shades specified from an ISL file?
You can set the contourInfoParams property in the display tag. There is an example of that in the userguide section. For color shading you can set the colorTableName property in the display tag.
Are there other types of 2-D imagery one can create with ISL? If so, what tags are needed? What about tags for the various 3-D imagery types?All displays are created with the <display> tag. The available displays types are in the attached file.
5) If I want to write multiple images from one ISL file, how do I clear the display between images?That is a really good question. Normally when a bundle is loaded by an isl script all currently loaded displays and data are removed. However, right now there is no way to explicitly remove displays and data directly from the isl. We'll add that in this week.
6) Eventually, I would like to create images from GRIB files. Do any of the answers to the above questions change when using GRIB files instead of netCDF files? Also, among the files that one can access with IDV, which ones, if any are GRIB files?There shouldn't be any differences. The IDV treats GRIB just like gridded netcdf files.
-Jeff
imagesequence Image display planviewcontour Plan view contour plot planviewcontourfilled Color-filled contour plan view planviewcolor Plan view color-shaded image imagecontrol 3 Color (RGB) Image radarsweep2d Radar sweep view in 2D radarsweep3d Radar sweep view in 3D rhi RHI level2CAPPI CAPPI radarvolumescan Volume Scan radarisosurface Radar Isosurface contourxs Contour cross section contourxsfilled Color-filled contour cross section colorxs Color-shaded cross section dataxs Data Transect trackcontrol Track Colored By Parameter planviewflow Plan view of flow vectors streamlines Stream line plan view of flow vectors planviewflow3d Plan view of 3D flow vectors windbarbplan Wind barb plan view of flow vectors flowxs Cross-section of flow vectors flowxs3d Cross-section of 3-D flow vectors windbarbxs Cross-section of wind barbs streamlinesoverz Streamlines over topography topography Topography isosurface 3-D Isosurface isosurfacebyanother Isosurface colored by another parameter planviewcontouroverz Plan view contour plot on topography planviewcontourfilledoverz Color-filled contour plan view on topography planviewcoloroverz Plan view color-shaded image on topography imagecontroloverz 3 Color (RGB) Image over topography profile Vertical Profile vprofile Vertical Profile (new) probe Data Probe timeheight Time/Height Display (Contours) timeheightshade Time/Height Display (Color Shaded) timeheightflow Flow Time/Height Display timeheightbarb Wind Barb Time/Height Display timeseries Time Series Display raob_skewt Skew-T for RAOB data raob_stuve Stuve for RAOB data raob_emagram Emagram for RAOB data profiler_timeheight Time/Height Display profiler_planview Plan View profiler_3d 3D View track_skewt Skew-T for tracks track_stuve Stuve for tracks track_emagram Emagram for tracks grid_skewt Skew-T for grids grid_stuve Stuve display for grids grid_emegram Emagram display for grids textdisplay Text/HTML display chatlogdisplay Chat Log Display moviedisplay Movie Display stationmodelcontrol Point Data Plot obslistcontrol Point Data List shapefilecontrol A shape file display control rangerings Range rings and radials rangeandbearing Range and Bearing between two points mapdisplay Map Display notecontrol A text note locationcontrol A display of station locations curvecontrol A drawing control drawingcontrol A drawing control frontdrawingcontrol Front display filedrawingcontrol A drawing control transectdrawingcontrol Transect drawing control locationindicatorcontrol A locationindicator wmscontrol WMS Control bgwmscontrol Background Image imagemoviecontrol WebCam display imagemoviecontrol2 Image Collection worldwind WorldWind Locations volumerender 3-D Volume Rendering omni A Visad spreadsheet display
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